Talk:Ledoyom

Pleas, help my with edition of this paper - I do not can english, only russian! It will be very good if anibody can translating the russian versia of this Paper! Heljqfy--Heljqfy 04:57, 17 September 2010 (UTC)

"Ledoyom" via GOOGLE'''  Ledoyom'''

Modern "classical" ledoemy and outlet glaciers of the Earth Ellesmere (Ellesmere Island), north of Canada. July 12, 2002

Accumulation area of glaciers on Ellesmere Ridge Osborne, northern Canada, August 5, 1997. Going down the valleys, the glaciers merge and fill the river valleys and intermountain depressions, forming a so-called. classic ledoemy VP Nekhorosheva

Intermontane basins, valleys, troughs and fjords are no longer accommodate the masses of ice that once they come down from the mountain border and penetrated them with the continental shelf and the glaciers have already developed independently by a complex system of tributaries and the atmospheric supply. East coast of Greenland. Icecap "pierce" nunataks. The absolute height of about 5 square meters, July 1996 Ledoemy - intermountain depressions and extensions of river valleys, which are completely filled (or filled in at the moment) glacier mountain frame [1]. Represent also a major element of net glacier systems, which is being developed in a mountain basin relief, being isometric or slightly stretched in terms of masses of ice, filling these intermountain basin. Evolved ledoemy replenished by ice flowing into them, valley glaciers, in addition, they can receive snow board and on its own surface [2].

Closest definition succinctly presented, and in one of the modern geographic dictionaries [3]. All these characteristics of AN Rudoy refers to the "classic" ledoemam Nekhorosheva [4]. From these positions to modern ledoemam can include many of the Canadian Arctic glacier, Greenland, Spitsbergen, Franz Josef Land, etc.

Contents [hide] 1 A term 2 Quaternary ledoemy 2.1 History and nature of the problem 2.2 Uimon Basin 2.2.1 Structure of esker in Uimon Basin 2.2.2 Morphology and structure of the edge of glacial forms in the mouths of river valleys 3 Changing the paradigm. Types ledoemov. ICE MOUND ledoemy and caught the lake 4 The scientific value of research problems ledoemov 5 Comments 6 Notes 7 Literature 8 topographic 9 References [Edit] On the term

The term and concept "Ledo" introduced to the academic community Soviet geologist and VP Nekhoroshev in 1930 at the III Congress of Soviet geologists in Tashkent [1]. Discussion at the congress was conducted at the same time the diagnostic criteria for "ancient" ledoemov past glacial epochs. This fact can be considered one of the rare and curious when the term and its contents have been proposed for the sole purpose of historical geology and appeared earlier than their current, fairly narrow, filling (see definition above). In times of VP Nekhorosheva term "Ledo" did not require add-on "ancient" because of other speech and did not go as do not cause significant discussions to discuss aspects of contemporary ledoemy now. Discussion of the same quaternary ledoemov activity continues at the present time. The first special study of morphogenetic types ledoemov made Russian glaciologist-geomorphologist AN Rudoy, although some work previously appeared on this subject (the main ones are listed in the notes overview - in the "giant ripples flow" [5]). He has also been proposed and pioneering classification ledoemov [6] [7], which is currently being developed as its author [4] [5] [8] [9] and other specialists [10] [11] [12] [ 13].

[Edit] Quaternary ledoemy

VP Nekhoroshev called ledoemami large relief forms, which were occupied by ice in the glacial maxima of the Quaternary period. The latest determination under ledoemami mean proper mass of ice, filling the appropriate ground surface roughness. Now, however, revealed that ledoemy expedient to study the complex, as glacial and physiographic and geomorphological sites, though, because most of the former ledoemov in the mountains are now vast and dry basins, and sometimes engaged in small lakes nelednikovogo origin [5 ].

Problem is not the discovery of modern ledoemov (as geographical features are, in fact, had long been known), and the development of geological and physical criteria for the selection ledoemov in past glacial periods, mainly - in the latter. This problem is solved by many earth sciences, but generally refers to the area paleoglyatsiologii and Quaternary glyatsiogidrologii.

Joining in ledoemah glaciers formed the independent centers, the surface which, according to modern concepts [7], due to the ice dammed and self-development could rise above the snow line. These glacial centers, in turn, fueled a powerful outlet glaciers emanating from the hollows of the river valleys up to the foothills. Correct reconstruction of the Quaternary, in particular, ledoemov, as well as establishing their relationships with the hollows of ice-dammed lakes are often completely change the idea of the size, type and dynamics of Pleistocene glaciations in the land [14]. AN Rudoy Under the intermountain basins in this article covers all the relatively large intra-(inter-) lowering the mountain (depression, depression) in the relief, regardless of their origin, surrounded by mountain ranges or systems [15].

[Edit] History and nature of the problem In Quaternary geology and geomorphology paleoglyatsiologii since the beginning of XX century, seriously discussed the question: Do large intermountain basin drevnelednikovyh areas in the Pleistocene glacial ice? The main argument in favor of the reality of the existence of Quaternary ledoemov considered the presence of ice and water-glacial deposits and relief at the bottoms of the intermontane basins. On this basis at the end of the first half of XX century in the Altai were isolated ledoemy Ukok plateau, as well as Dzhulukulskoy, Chui, Kurai, Uimon, Leninogorsk, May-Kopchegayskoy and Mark-Kul [16] [17]. Essentially, all of intermontane basins of the Altai-Sayan region, except for depression Teletskoje lake at that time were assigned to ledoemam. This is because the estimated G. Grane [18] [19] and LA Vardanyants snowline depression in the last glacial maximum was 1150-1200 m, and this depression could not invoke the nomination Late Quaternary glaciers in the basin, which is calculated on a simple formula of the same LA Vardanyants [19].

Largest Quaternary ledoemy Altai

Late Quaternary lacustrine terrace (about 15 thousand years ago) Kurai glacial-dammed lake on the southern slope of the Kurai Ridge. The white band - Chui path to the right - to the village. Kosh-Agach. The height of the upper lake levels higher than 2200 meters above sea level at middle elevations of the modern bottom Kurai Basin - below 1600 m. Aerial. Dropstounov field at the bottom Chu Quaternary glacial-dammed lake. In the background - the northern slope of the ridge Sailugem, which are clearly visible lacustrine terraces. These terraces - traces of ice-dammed lake, which is coming down the mountain glaciers and icebergs are produced, one of them and left these dropstouny during discharge of the lake (about 15 thousand years ago [20]). The central part of the modern bed Chu Quaternary glacier-dammed lake. To scale the foreground are camels. In the background is partially visible flanking the Chui valley South Chui and spurs of the North-Chu Range. Later it was found that in some intermontane basins of the Altai, for example, in the Kurai and Chu, which would have to occur Pleistocene ledoemy, no obvious moraines nor certainly fluvioglacial formations like no, and hence ledoemov they do not exist [21] [22].

For decades, this situation led to the debate, which was attended by all working in the mountains of southern Siberia, geologists and geographers. Debate is exacerbated by the fact that most of the slopes of intermontane basins is clearly preserved lacustrine terraces. This could mean that the basin served as a receptacle for the lake waters, which were thought not to leave room for ice. However, some geologists, such as AI Moskvitin believed that because of the peculiarity of the formation mechanism of ledoemov on the bottoms of the last moraine could sometimes not be delayed. Thus, in the Chu valley in the Altai, consider this research, the lower part of ice ledoeme remained inactive and formed the moraines and the upper part and of itself bore little moraine material. Lakers same terrace in this and in other basins were classified AI Moskvitin to preglacial and postglacial lakes. So reasoned and other professionals. In the midst of debate about the boundaries of the Quaternary glaciers, where the area of ancient glaciation in different studies is reduced almost to modern, they covered almost all of the land, barely leaving the land for highland lakes and the organic world, saw the light of the extensive article by E. Shchukin, R. Shorygin D. and V. Popov [23] [24] [25], suggesting that intramontane waters of southern Siberia existed in pre-glacial and interglacial time. But in the glacial epoch, the ideas of these researchers, nor Chui, no Kurai, nor Uimon valley glaciers are not fully engaged.

Discussion of the early 1960's reminds somewhat paradoxical situation in 1930 when the period of fascination with ideas ledoemov Nekhorosheva AV Aksarin [26] explained the appearance of lakes in the Chu valley in the Altai tectonic subsidence of the North-Chu ridge, and B. F. Speransky, one of the most ardent supporters of the Altai ledoemov, was forced to accede to it and sync Chu Quaternary lake since the last interglacial epoch. At the same glacial epoch in Speransky and Aksarinu in all intermountain depressions were ledoemy. Thus, the evidence for the existence ledoemov in different basins often proved just the opposite: in some caves as evidence of completion of their proposed ice moraine, and in others - their absence and the presence of lacustrine terraces. This circumstance was pointed EV Deviatkin et al [21]. They re-examined in detail the arguments of his predecessors and formulated the main geological and geomorphological features ledoemov:

the presence of active and sufficiently powerful glaciers in the mountain surrounded by troughs; areal development in the basins of the main boulder-loamy moraine boulders petrography which is identical with the geological facies of the surrounding mountain ranges; intraglyatsialnyh presence of water and ice formations - kames, terraces, kames and esker, which show "the broad development of dead ice" in the stage of deglaciation; presence in the lower parts of basins of lake-glacial deposits and surviving mainly moraine-dammed lakes; presence of traces of gouging in the basins; presence in the marginal parts ledoemov marginal meltwater drainage channels degraded glaciers. In the aggregate these signs EV Deviatkin colleagues identified Berteksky, Tarhatinsky, Dzhulukulsky ledoemy and ice Ukok plateau. Since, as we believed these geologists, in Chui, Kurai, Uimon and similar basins, moraines not, and ledoemami they are not.

It must be noted that the six selected diagnostic characteristics ledoemov main EV Deviatkin et al believe is still the second. If the moraines and fluvioglacial forms in the basins is not, then all the other symptoms, according to the article, do not play a role and can be explained by anything, but not the work of glaciers. Since the question of the origin ledoemov always put together with the existence of large basins of ice-dammed lakes, the alternative explanations of the genesis "controversial" landforms and sediments were given, usually with a lake of positions. It is thus received in their time with "Oz Obrucheva in Uimon intermountain basin [7].

However, the existence and themselves basin ice-dammed lakes in the Pleistocene glacial mountains of Siberia require specific evidence of their origin and their age. Clearly, if in the caves there is "obvious" moraine topography, such as the plateau Ukok in Dzhulukulskoy, Tarhatinskoy Ulagansky and hollows, the more likely they were "classic" ledoemami Nekhorosheva. Much more interesting is the situation when in the intermontane basins such "obvious" forms do not, but ledoemy based on paleoglyatsiologicheskih considerations were to occur [K 1], [19]. More difficult it is in cases where depression have geological traces of glacial lakes. Well, finally, if traces of these lakes (lake terraces and sediment) are diagnosed as uncertain, needinodushno, but the lake as ledoemy, based on the same paleoglyatsiologicheskih models [27], must still be formed, reconstruction, at first glance generally reaches an impasse. Moreover, additional evidence (material drilling, new career, exposure, etc.) regulations do not change, but, as will be shown below, often exacerbated. In this sense, revealing Uimon basin in the Altai. There should have been, and quaternary ledoemy, and ice-dammed lakes, but reliable geological traces nor those of any others in this valley there is not [K 2].

[Edit] Uimon Basin Uimon intermontane basins of the largest basins of the Altai. From the south it is bounded by the highest in Siberia Katun ridge, which carries a powerful modern glaciation. The absolute marks of Katun ridge reaches 4500 m (height of the mountain Belugas - 4506 m). In the north basin is limited Terektinsky ridge that also has modern, mostly cars and slope glaciers. The river valleys of both ranges are in the upper part of the profile troughs with a different set of well-developed terminal moraines. Most of the moraines podpruzhivayut Lake, the largest of which are Katun ridge. The bottom of the valley gently sloping to the east. It is filled with loose sediments polifatsialnymi, among which the river Katun. Katun's edge at the output of the basin (gidrostvor Katanda) is 904 m above sea level.

Uimon intermountain basin in the Altai and its flanking mountain ranges

Mount Belukha, the Katun Range, Akkemsky Glacier (glacier Rodzevich). Southern border Uimon intermountain basin, July 11, 2007.

Uimon depression in winter. Taken from the slope of the ridge Terektinsky through the bottom of depressions in the foothills of Katun ridge. Below - a village Chendek.

From the bottom Uimon depression on Terektinsky ridge. Conclusion about the origin is a large lake has been postulated on the following basis: because the glaciers Katun Katun ridge filled the valley below the basin, the runoff from the latter was podpruzhen and basin filled with water [1] [16] [18] [28]. However, this is a fair assumption, until recently, found no reliable evidence of factual material. In contrast, in 1914 VAObruchev found in the central part of the basin in terms of a long winding shaft, characterized it as the Lake [29]. Later EV Deviatkin colleagues argued that the "lake Obrucheva" actually has erosion origin and, within Uimon depression glacial formations can not be, because the ice basin Katun and its tributaries did not reach the trough, and ends at mountains. Just thought, and GF Lungersgauzen and GA Schmidt, noting that "Lake Obrucheva" - a beach ridge of an ancient lake [21]. In 1973, PA Okishev described a series of shafts and proved the correctness of the hypothesis VAObruchev. However, this is the most he has shown and what Uimon basin filled with ice, then there was ledoemom [30]. Nomination of glaciers Katun ridge into the valley of the river Katun, as stated above, calculated by the formula LA Vardanyants. However, in the middle of last century MV Thrones wrote that when developing their model LA Vardanyants not take into account the effect of the ice dammed. Given the recent depression in the snow line at 1150 m Katun, for example, the glacier could not have the dimensions shown in the diagram LA Vardanyants. Therefore, MV Thrones believed that a depression of the snow line was much smaller, or the Katun glacier would advance much further, ie go Uimon depression [31].

So now, as before, the problem of Siberian ledoemov still being decided on the principle of "either-or": either Ledo, or pond.

Therefore it is expedient to apply to the argument of views on the mechanisms of ledoemov different types in the light of old and new materials and ideas in the last quarter of XX century [4]. Thus, the existence of a valley in the Altai Uimon large ice-dammed lakes and ledoemov indicate the following facts.

[Edit] The structure of the esker in Uimon Basin

Sketch of the classic esker

The structure of the esker, which is typical for all intraglyatsialnyh forms. Sweden, May 30, 2008. Near the old airport of Ust-Cox in the wall of a career high of about 5 m revealed the following section (top to bottom):

loam brown wrapper, with a capacity of up to 1 m; Sands clearly stratified, coarse-and coarse-grained, gray, friable, scoured. [Edit] The structure of the esker in Uimon Basin

Sketch of the classic esker

The structure of the esker, which is typical for all intraglyatsialnyh forms. Sweden, May 30, 2008. Near the old airport of Ust-Cox in the wall of a career high of about 5 m revealed the following section (top to bottom):

loam brown wrapper, with a capacity of up to 1 m; Sands clearly stratified, coarse-and coarse-grained, gray, friable, scoured. Stratification in the general case, according to the underlying sculpture, sometimes broken. In addition to the orientation of the grains according to the bedding bedding emphasized by alternating coarse-and coarse-grained horizons. Often there are pockets of the country rocks. Layer thickness - up to 3 m; sands brown, layered, integrated into all horizons in the form of long strips, at least - lenses; gravel and pebbles neyasnosloistye. Sloevatost planned alternation of debris size, regardless of the orientation of the cut, it has a dome, "anticlinal" look. Pebbles, particularly at the top of the stack loose. By the bottom of packs an increase in grain size of clastic material simultaneously with a decrease in clarity of texture. Apparent power - up to 4 m; Sands gravelistye, gray, horizontally bedded, included in the previous horizon in the form of layers. Described section is typical for all exposed outcrops or clearing esker depression [7]. However, none of them at the bottom of the section is not exposed moraine, whose formation precedes or synchronous formation of kames and esker and whose presence in the intermountain depressions is considered one of the main arguments in favor of ledoemov [1] [21], although some studies indicated that oses and may be underlain by bedrock [32].

In 1975 AN Rudoy tried to open the "root" Rosa, located in a ledge of the left-bank erosion terraces Katun River. Ditches was passed the call to the Katun esker slope, and upper terraces, "cut" at the bottom of the basin. In the wall of the ditch was found (from top to bottom):

turf; loam wrapper, brownish-gray with a few patches of dark gray sandy loam. Layer depth - about 2 m; sand is dark gray, coarse and gravelisty. Exposed in the form of lenses, wedges, and pockets. Power streaks - 30 cm; sandy loam is light brown, dusty, with streaks and lenses of boulder loams. Detrital material well-rounded, power - about 1 m. below the base layer - slaughter ditch falls under the area terrace, which is described by the lake. It was opened: gravel and pebbles with rare and small boulders. Horizon has a distinct subhorizontal bedding. Gravel and pebbles of medium and well-rounded. Sole layer goes under the working face. Visible penetrated the layer depth - 2 pm Based on the structure of the esker, we can say that eskers are not on the main moraine, a lake on the pebbles.

[Edit] Morphology and structure of the edge of glacial forms in the mouths of river valleys

Otdeshifrirovanny aerial field marginal esker in the mouth of the river valley and Animations section below [33]. In the estuary of the river valley Animations in the south-eastern slope of the river basin Uimon cuts the moraine, composed of boulders, sand and gravel and pebble aggregate. In general, the incision is characteristic increase in the proportion of clastic material from the top down in the section. Fragments of well-rounded, have a rounded shape, size boulders reach 0,5 m in diameter. Bouldery material eroded significantly and presented biotite and biotite-hornblende granites. Gravel and pebbles, in contrast, have a very fresh look. Power exposure - about 4 m. The two rivers Animations and Akçay, on the right bank of Katun river is a vast field subkontsentricheskih chains vzaimoparallelnyh shafts and the hills of a height greater than 4 m, divided by shallow ditches. According to this relief morphologically very similar to the ribbed moraine (a year-long moraine De Geer), but not on the giant signs ripple currents, as did Vladimir Butvilovsky with N. Prehtelem [34]. Opposite the village Akkoba this relief at an acute angle to the ridges are cut Katun, where over 0,5 km opened (top down):

loam wrapper grayish-brown, silty, with a capacity up to 1,5 m; gravel and pebbles with occasional small boulders. Clastic material mainly has a fresh look, in the northern part of the cut caught significantly weathered boulders of biotite granites. Rounding of boulders and a good average. In general, the horizon of well-washed, coarse-grained filler before and gravelistym sand, its content is low. Only in the northern part of the section met with thin (10-15 cm), elongated sand layers. Within these streaks is very thin subhorizontal bedding. Occasionally at the base of the northern portion of the bulk occur lenses of brown silty clay loam. Total bedding horizon repeats Profile topographic surface is most clearly expressed in the central and southern exposure. Horizon thickness - up to 4 m; loam dark brown, water-saturated, horizontal stretches across the transect. Power - 20-30 cm; boulder to pebble gravel and sand aggregate. The boulders are well rounded and completely, have a rounded shape, a diameter not exceeding 0,4 m. any sort in the layer is absent. The apparent thickness of the layer - 3 m. Below - scree. As can be seen from the description and the figure, ridge-trough relief of the surface complex fluvial wavy-stratified deposits, which together with the spatial orientation of the ridges allows us to classify it as a system of marginal esker, formed in water at the edge is spread to the mouth of the river Akcha glacier. The structure of the ridges is involved and moraine material, and contact the main moraines and shingle gravelistyh not always so perfect, as described in the outcrop. Boulder loam in the outcrop Animations similar layer (4 in a row at the top) in the outcrop Katun, but the water-ice layer at the top of the first missing. In half a kilometer west of Multinsky road on the right bank of the Katun quarry opened one of the individual ridges, whose base is overlain by poorly rounded boulders mixed with gravel, sand and clay. The roof of this section consists of well-washed pebbles.

Based on consideration of outcrops and clearings can be concluded that the system marginal esker south-eastern periphery Uimon depression involved and moraine ridges. The relationship of water-glacial and glacial-accumulative deposits have been shown to fold in three ways:

gravel pebbles according to overlap the main moraine deposits; esker sediments may have moraine core with an uneven, ragged, contact; water-glacial gravels do not participate in the structure of the ridges. Results of a study of the frontal glacial relief in Sweden and Canada have shown that the marginal eskers and ribbed moraine similar to those described to arise in conditions of high horizontal stresses in the end zone of the glacier, which responds to them as frail body [35] [36]. J. Elson said paragenetic relationship between De Geer moraines and marginal esker. H. Hoppe believed that De Geer moraines can be formed only at the contact with the glacier lakes, which causes seasonal volatility of the glacier and leads to cracks are closely spaced, which is squeezed from the main bed of the glacier moraine (moraine diapirs). At the same time, as shown by field surveys AN Rudoy, the edge cracks and nalednikovymi vnutrilednikovymi melt water streams and water-deposited glacial material:

And the morphology of ridge topography in rivers pp. Cartoons and Akçay indicate that glaciers in these valleys sank into a pond, that existed in the basin in the glacial period. The fact that developed in the central valley esker chains lie directly on the lake sediments, but under ozami and around them there are no synchronous moraine formation can be explained only by the fact that the eskers were formed on the ice sheet, which is fully booked Mirror Lake. This cover was a united afloat "shelf" ice foot and Katun Terektinsky glacial centers. In the decay of glaciation, the descent of the lake (or squeezing) the icecap sank to the bottom of the basin. Perhaps at this stage among the array of dead ice formed intraglyatsialnye ozopodobnye form. In the second case, documented in rivers pp. Cartoons and Akçay, the very structure and morphology of the ridge topography, as though convincing evidence that the valley glacier in contact with the water basin.

In his earlier works, AN Rudoy not synchronize these two events and include education esker in the central part Uimon cavity to the middle Pleistocene, and the field of marginal esker its periphery - to late. Now he believes it is wrong. Based on the "freshness" Morphology of edge forms, as well as on the basis of evidence (including - and absolute dating) to other mountain-valley areas [37] [38], this researcher believes that the events captured in the edge of glacial formations Uimon Depression, date back to the end of the last glaciation (18.12 thousand years ago), though marginal eskers Animations - Akçay fix most final stage Würm glaciation of the Siberian mountains and are more youthful than the "eskers Obrucheva. Of course, the clarity in this question can make a new absolute dating, which Uimon hollow now, just no, but the reliability of the available neighboring land, unfortunately, is small, and few of them [33].

[Edit] Changing the paradigm. Types ledoemov. ICE MOUND ledoemy and caught the lake

So by the end of XX century it was found that (classical) ledoemy Nekhorosheva - is only one and not the most common scenario of lake-glacial history of the intermontane basins [4]. Development issues ledoemov was made on the basis of an entirely different paradigm: "and the reservoir, and ice." Such an approach was made possible because the calculations of the volume of melted ice flow [39] [40] it was proved: by the time the climax of glaciation most major intermontane basins have been occupied ice-dammed lakes.

Stages of formation of "captive lakes in intermontane basins of southern Siberia 22-25 thousand years ago. (K) and (C) - Kurai and Chu glacier-dammed lakes; (G) - River Gorge between Chui Chui and Kurai depressions. (1) - the transgression of ice-dammed lakes in intermontane depressions were synchronous taps of glaciers. At maximum transgression of mountain glaciers reached the level of lakes in the hollows and surfaced (25-22 thousand years ago). (2) - connect to the floating "shelf" ice is completely booked surface of ice-dammed lakes, which were transformed into "catch of the lake (22-20 thousand years ago). Further lowering of the snow line (about 20-18 thousand years ago) led to the fact that in the intermountain depressions occurred independent of glacial centers, consisting of lenses of lake waters, covered with ice, lake and ICE MOUND ice and snow-firn layer. (3) - position of the scheme (1) in the plan. (4) - Profile of the line A-B by Chui and Kurai basins [4]

American geologist Lee Keenan (Keenan Lee) is studying lake-glacial deposits cut Chagan, Chagansky skeblend, South-Eastern Altai. Depending on the morphology of the intermontane basins of magnitude of depression of the snow line in the surrounding mountains and the energy dependence of the Quaternary glaciation glaciers relationship evolved over several scenarios [33].

Only Ledo, without the lake (the "classic ledoemy" VP Nekhorosheva). These include all ledoemam lifted high intramontane basin of Siberia with moraine and water-ice topography on the bottom. In Altai, in particular, this Ulagansky, Dzhulukulskaya, Tarhatinskaya Bertekskaya and depression. Body of water and ice together. This model considers the case when the surface of a large ice-dammed lake down from the mountain valley glaciers merge afloat ("ice shelves" mountain country) and covered the lake. A so-called trapped Lake («catch lakes», according to AN Rudomu). Caught Lake Wisconsin age arising under model AN Rudoy, recently renovated, and in British Columbia [41]: Mechanism is very energetic, catastrophic squeezing of subglacial lakes and the sea under a huge ice load grew, apparently prevailing in the stages of the climax of glaciation. Diluvial channels subglacial discharges (subglyatsialnye spillvei), formed under the pressure of the Late Pleistocene (Wisconsin) glacial lobes in the Southern Ontario, Alberta, Quebec and the Northwest Territories of Canada today, have been described, for example, TA Brennand and J. Shaw [42]. Formation of separate forms of relief (in particular, some drumlinoidov), whose origin is attributed to the earlier glacial morphogenesis, TA Brennand and J. Shaw explained strained water-erosion dynamic environment under the ice sheets.

JA Piotrowski investigated diluvial under ice forms on the German North Sea coast. Under the influence of ice load Quaternary subglacial lake Stolper was squeezed into the sea here, and in the end, the nature of which was disastrous, were formed deep diluvial-erosional channels - spillvei (tunnel valleys), the largest of which - the channel Bornhevd - had a depth of 222 m in the length of the almost 13 km and was located about 200 m below modern sea level [43].

Finally, it is logical, but unexpected, even for AN Rudoy, culminating in the development of his concept of ICE MOUND ledoemah and caught the lake became final reconstruction MG Grosvalda of the giant Arctic subglacial lake, systematic and catastrophic spills on the surrounding land under heavy stress Quaternary majestic Arctic glacier, the marginal parts of which are also experiencing regular Sergi [44].

ICE MOUND ledoemy. This model considers the case when the boundary of glaciers dropped below the water table. On-site ponds, a complicated formations consisting of a powerful lens of melt water, armored lake, and glacier ice ICE MOUND, as well as snow and firn layer. Surface of the lakes involved, so the zone glaciers and become new centers of glacial ice subradialnym outflow (positive inversion glacial morphosculpture). As additional evidence of the reality of the existence of ICE MOUND ledoemov can still lead the structural features of tape "clay" in the largest of the Altaic locations - in the river valleys and Chagan Chagan-Uzun. Special studies [45] showed that the rate of accumulation of these deposits in the location of Chagan was about 2-4 mm / year, and in the context of Chagan-Uzun - from 10.8 to 15 mm / year. We also managed to figure out what to cut Chagan there are special layers of clay composition, the exposure (about 10 mm) capacity, at various intervals repeated throughout the column. These layers are called "cryochrons. Holocene layers correspond to several years with very short and cold ablation period, and most likely - all without him. During these periods, proglacial lakes not broken the ice at all, and at the bottom of their accumulated (defended) predominantly particularly fine sediments that failed precipitated earlier. This precipitation occurred against the background of almost complete cessation of runoff from melting glaciers feed the lake and the lack of revenue in the proglacial reservoirs of new portions of solid material. Further cooling and an increase in moisture causes a further lowering of the equilibrium line of glaciers up until the latter did not fall below the level of lakes. Initiate the formation of ICE MOUND ledoemov.

Another confirmation of the hypothesis ICE MOUND ledoemov are the results of decades of work in modern lakes, oases of Antarctica [46] [47]. According to these works, with the average air temperature at the surface to -20 ° C in one of the largest Antarctic lakes, Lake Vanda, which exists mostly in the under-ice mode, the near-bottom water layers can be heated to +25 ° C. Lake ice capacity of about 4 meters is not only a kind of shield that protects the pond from low temperatures and wind, but also the natural ice lens, which increases the thermal effect of intensive inflow of solar radiation component here in the summer to 170 kcal / m ² · hour. MS Krass [48] showed that short-period fluctuations in climate impact mainly on small ponds Antarctic oases, but little or no effect on the thermal regime of large lakes. A large thermal margin last gives them a big lag. With further lowering of the equilibrium line below the water's edge of lakes in them, as already shown examples of the Altai ICE MOUND ledoemov, may persist for a long time due to the heat accumulated earlier and to the extent of formation and accumulation on the surface of frozen lakes of the snow-firn layer and its diagenesis lake will outside the influence of seasonal fluctuations in air temperature, that is transformed into water lens.

Only ice-dammed lake Ice-dammed lakes, in general, are large accumulations of water that occur before the edge of the ice sheets, as well as extensions of the mountain river valleys in their dammed valley glaciers [49].

edit] The scientific value of research problems ledoemov

Палеогляциогидрологическая scheme Altai Republic [7] (compiled and refined by the author in 1987-2005.).

Young Hollow Lake Teletskoye in the glacial period was going through the stages of all kinds ledoemov, depending on changing over the millennia glyatsioklimaticheskoy environment, as well as engaged and glacier-dammed lakes (at least in the final stages of the last glaciation). December 10, 2003, NASA. At different scales of glaciation and at different times of the same name valley experienced a different sequence of lacustrine-glacial events. For example, Chui, Kurai and Uimon depressions in the Altai going through the stage and ICE MOUND ledoemov, and catch the lake. Both phases were preceded and stages of ice-dammed lakes [4]. The same sequence experienced depression of Lake Baikal, and Teletskoje Tolbo-Nur in northwest Mongolia. DV Sevost'yanov [11] to the ICE MOUND ledoemam found it possible to include in some stage of the Late Quaternary proglacial lakes Chatyrkel and Sonkel in the Tien Shan. The same researchers believe that a certain lake of Kara-Kol in the mountains of the Eastern Pamirs could also survive in its history, the stage of ICE MOUND ledoema. However, all these ice depressions, apparently, were not filled.

Other ledoemy, such as depression Ukok plateau in the south of the Altai, during the climax of glaciation is fully involved in ice, so it's classical ledoemami Nekhorosheva. Ice-dammed lake existed here as the initial and final stages of glaciation.

Captured lake and ledoemy ICE MOUND type of great interest. It is they who at the time of maximum cooling sources were the largest outlet glaciers in middle and low mountains. By joining in the piedmont plains, the last formed extensive ice sheets and glaciers complexes. Likely counterparts such culmination, ledoemov phase of development of different types can serve as a huge subglacial water under the lens of more than 4-kilometer thick ice in areas Dome B, Dome C (English) Russian. and the Vostok station in Antarctica.

All intermontane basins of Central Asia have survived in the Pleistocene stages ledoemov. Actually, the term "Ledo» («ledoyom») means today as the intermountain basin occupied by glacial ice content ice («ice body»), and a special morphogenetic and dynamic type of ice [4] [33].

Opening in the Altai phenomenon ledoemov different morphodynamic and genetic types is of great scientific importance, not only for the Quaternary geology and palaeogeography of mountainous countries. The concept of ICE MOUND ledoemov and caught lakes helps with fundamentally new positions reflect the diversity of modern and ancient rock and ice sheets, as well as genetically and geographically related geophysical phenomena, not only on Earth but also on some other planets and the planetoid solar system whose surface or consists of ice, or owes its appearance the work of glaciers and meltwater [50].

[Edit] Comments

↑ For example, in the middle of the XX century MV Thrones noticed that if the calculated LA Vardanyants snowline depression in the Pleistocene was indeed such (a kilometer), then all the Katun glacier ice center would have to leave the mouth of its valley, and in narrow places Katun river valley below Uimon depression they were podpruzhivat last. In this case, the above formed ice dams in the basin will inevitably occur should have been ice-dammed lakes. ↑ During the geological survey of a large scale in the field season of 2006 geologists Gorno-Altai Geological Expedition AN Rudoy and G. Rusanov found in the marginal parts of the northern foothills of Katun ridge in the bottom of a deep depression Uimon young developing the ravine, which opened a purely washed clear laminated sand and sandy loam capacity of more than 20 m, with a clear lake shape. These data have not yet been published, and the incision requires further study. [Edit] Notes

↑ Show compactly

↑ 1 2 3 4 VP is not good. Modern and ancient glaciation of the Altai / / Proceedings of the III Congress of Geologists. - Tashkent: 1930. - V. 2. - S. 143-156. ↑ Grosvald MG Ledo / Glaciological Dictionary, Ed. VM Kotlyakov. - L.: Gidrometeoizdat, 1984. - S. 228. - ISBN 5-1179361 ↑ V. M. Kotliakov, A. I. Komarova. Ice reservoir / / Elsevier's dictionary of geography: in English, Russian, French, Spanish and German. - Amsterdam - Oxford: Elsevier, 2007. - P. 358. - ISBN 0-444-51042-7 ↑ 1 2 3 4 5 6 7 Rudoy A. N. Mountain Ice-Dammed Lakes of Southern Siberia and their Influence on the Development and Regime of the Runoff Systems of North Asia in the Late Pleistocene. Chapter 16. - In: Palaeohydrology and Environmental Change / Eds: G. Benito, V. R. Baker, K. J. Gregory. - Chichester: John Wiley & Sons Ltd., 1998. - P. 215-234. ↑ 1 2 3 Rudoy AN Giant ripple current (history of research, diagnosis and palaeogeographical significance) - Tomsk: Tomsk State Pedagogical University, 2005. - 228. ISBN 5-89428-195-4 ↑ Rudoy AN Regularities modes and mechanisms of discharges of ice-dammed lakes in intermontane basins. Chapter 5.3. Ledoemy and water / Thesis ... candidate of geographical sciences. - Moscow: Institute of Geography of the USSR, 1987. - S. 155-161. ↑ 1 2 3 4 5 AN Rudoy. Ledoemy and glacier-dammed lakes of the Altai in the Pleistocene / / Proceedings of the All-Union Geographical Society, 1990. - T. 122. - Vol. 1. - S. 43-54. ↑ Rudoy AN Glacier accident in the recent history of the Earth / Nature. - 2000. - № 9. - S. 35-45. ↑ Rudoy AN Quaternary ledoemy Mountains of South Siberia / / Materials of Glaciological Research, 2001. - Vol. 90. - S. 40-49. ↑ Redkin AG Natural conditions Ukok plateau in the late Pleistocene-Holocene thesis ... the candidate of geographical sciences. - Barnaul: Altai University, 1998. - 174. ↑ 1 February Sevost'yanov DV different-rhythms and trends in the dynamics of moisture in Central Asia / / Proceedings of the Russian Geographic Society, 1998. - T. 130. - Vol. 6. - S. 38-46. ↑ Jerome-Etienne Lesemann, Tracy A. Brennand. Regional reconstruction of subglacial hydrology and glaciodynamic behaviour along the southern margin of the Cordilleran Ice Sheet in British Columbia, Canada and northern Washington State, USA / / Quaternary Science Reviews, 2009. - Vol. 28. - P. 2420-2444. ↑ Grosvald MG Eurasian hydrospheric disaster and glaciers in the Arctic. - Moscow: Scientific World, 1999. - 120. ↑ AN Rudoy. Once again the issue of Quaternary ledoemov mountains of southern Siberia. - «III century of mining and geological survey of Russia" in Proceedings of the Regional Conference of Geologists of Siberia, Far East and North-East of Russia. - Tomsk: Tomsk State University, 2000. - S. 20-22. ↑ Rudoy AN Fundamentals of diluvial morpholithogenesis / / Proceedings of the Russian Geographical Society. 1997. T. 129. Vol. 1. S. 12-22. ↑ 1 2 AI Moskvitin. Altaic ledoemy / / Izv. Geologic Series, 1946. - № 5. - S. 143-156. ↑ BF Speransky. The main stages of the Cenozoic history of the Southeastern Altai Vestnik Zap.-Sib. Geology Trust, 1937. - № 5. S. 50-66. ↑ February 1 IG Grane. On the ice age in the Russian Altai, "Izv. Zap.-Sib. Dep. RGO. - Omsk, 1915. - Vol. 1-2. - S. 1-59. ↑ 1 2 3 LA Vardanyants. On the ancient glaciation of the Altai and Caucasus, "Izv. Gos. geogr. of the Society, 1938. - T. 70. - Vol. 3. - S. 386-404. ↑ Rudoy, AN, Brown, E. G., Galakhov VP, etc. Chronology of Late fluvioglacial disasters in southern Siberia on new cosmogenic data. ↑ 1 2 3 4 EV Devyatkin, NA Efimtsev, Yu.P. Seliverstov, I. Chumakov. More on ledoemah Altai / / Proceedings of the Commission for Quaternary Research, 1963. - Vol. XXII. - S. 64-75. ↑ GF Lungersgauzen, OA Rakovets. Some new data on stratigraphy of the Tertiary deposits of the Altai Mountains, Trudy VAGT, 1958. - Vol. 4. - S. 79-91. ↑ E. N. Shchukin. Regularities in the distribution of Quaternary deposits and stratigraphy of the territory of the Altai / / Proceedings of the Geological Institute of the USSR, 1969. - Vol. 26. - S. 127-164. ↑ LD Shorygin. Stratigraphy of the Cenozoic Western Tuva, Trudy Geological Institute, USSR Academy of Sciences, 1969. - Vol. 26. - S. 127-164. ↑ VE Popov. On the ancient coastal formations in the Kurai steppe in the Altai / Altai Glaciology. - Tomsk, 1962. - Vol. 2. - S. 78-90. ↑ AV Aksarin. On the Quaternary sediments of the Chu steppe in south-eastern Altai, Vestnik Zap.-Sib. Geology Trust, 1937. - № 5. - S. 71-81. ↑ VP Halacha. Simulation modeling as a method of glaciological reconstructions of mountain glaciers. - Novosibirsk: Nauka, 2001. - 136. ↑ VI Vereshchagin. By Katun proteins. / / Science and Geography, 1910. - № 10. - S. 50-60. ↑ VAObruchev. Altaic studies (study first). Notes on the traces of ancient glaciation in the Russian Altai / / Geography, 1914. - Kn. 1. - S. 50-93. ↑ PA Okishev. Traces of ancient glaciation in Uimon basin. - Problems of Glaciology Altai Mat. Conf.: Tomsk, 1973. - S. 63-71. ↑ MV electrons. Questions mountain glaciology. - M.: Geografgiz, 1954. - 276. ↑ A. Raukas, E. Ryahni, A. Miydel. Boundary ice formation in Northern Estonia. - Tallinn: Valgus, 1971. - 288. ↑ 1 2 3 4 Rudoy AN Quaternary ledoemy Mountains of South Siberia / / Materials of Glaciological Research, 2001. - Vol. 90. - S. 40-49. ↑ Butvilovsky VV Prehtel H. Peculiarities of the last glacial epoch in the basin of Coke and the upper Katun / / Modern problems of geography and environmental management. - Barnaul: Altai University, 1999. - Vol. 2. - S. 31-47. ↑ Elson, J. Origin of Washboard Moraines / / Bull. Geol. Soc. Amer., 1957. - Vol. 68. - P. 324-339. ↑ Hoppe, G. Glacial morphology and inland ice recession in Northern Sweden / / Geogr. Ann., 1959. - № 4. - P. 1-17. ↑ Rudoy, AN, Kir'yanova MR-dammed lake and glacier formation and Quaternary Paleogeography of the Altai / / Proceedings of the Russian Geographical Society. 1994. - T. 126. - Vol. 6. - S. 62-71. ↑ Rudoy, AN, Zemtsov VA New simulation results of hydraulic characteristics diluvial flows of Quaternary Chuya-Kurai of ice-dammed lake. ↑ Rudoy AN mode of ice-dammed lakes in intermontane basins of Southern Siberia: Proceedings of glaciological studies. 1988. Vol. 61. S. 36-34. ↑ Rudoy, AN, Galakhov VP Danilin L. Reconstruction of the glacial runoff of the upper Chui and nutrition of ice-dammed lakes in the late Pleistocene / / Proceedings of the All-Union Geographical Society. 1989. T. 121. Vol. 2. S. 236-244. ↑ Jerome-Etienne Lesemann, Tracy A. Brennand. Regional reconstruction of subglacial hydrology and glaciodynamic behaviour along the southern margin of the Cordilleran Ice Sheet in British Columbia, Canada and northern Washington State, USA / / Quaternary Science Reviews, 2009. - Vol. 28. - P. 2420-2444.

Compiling the model AN Rudoy article Jerome-Etienne Lesemann & Tracy A. Brennand Powered by Article Canadian geologists figure (see right), essentially copying the model of AN Rudoy, has no caption a reference to the name of the author's own reconstruction. A short footnote to what is shown here in the main article, the Russian-language Wikipedia article "Ledo", original drawing's model, first published AN Rudym in 1998, given only the text of the publication Dzh.-E. Lezemana and T. Brennand, who, in response to reasonable request to explain the incorrect use of foreign materials, responded that "all and so clearly the true authorship of Rudy" from the text of their own work. ↑ Brennand, T. A., Shaw John. Tunnel Channels and associated Landforms, south-central Ontario: their Implications for Ice-sheet Hydrology / / Canadian J. Earth Sc., 1994. - Vol. 31 (31). - P. 505-521. ↑ Piotrowski, J. A. Tunnel-valley formation in northwest Germany - geology, mechanisms of formation and subglacial bed conditions for the Bornhoved tunnel valley / / Sedimentary Geology, 1994. - Vol. 89. - P. 107-141. ↑ Grosvald MG glaciation of the Russian North and North-East in the era of the last great cooling / / Materials of Glaciological Research, 2009. - Vol. 106. - 152. ↑ Rudoy AN to the diagnosis of tree belts in lake-glacial sediments of the Altai Mountains / / Proceedings of the All-Union Geographical Society, 1981. - T. 113. - Vol. 4. - S. 334-339. ↑ Bardin VI Lakes in Antarctica: paleoglyatsiologicheskie aspects of the study / Antarctica. Reports of the Commission, 1990. - Vol. 29. - S. 90-96. ↑ Bolshiyanov DY, Verkulich S. R. New data about the development of the Bunger Oasis / Antarctica. Reports of the Commission, 1992. - Vol. 30. - S. 58-64. ↑ Krass MS Thermophysics oases lakes in Antarctica / / Antarctic. Reports of the Commission, 1986 - Vol. 25. - S. 99-125. ↑ Kotlyakov VM glacier-dammed lakes. - Glaciological Dictionary, Ed. VM Kotlyakov. - L.: Gidrometeoizdat, 1984. - S. 210. ↑ VM Kotlyakov. One hundred meters from the secret (of Antarctic subglacial lake Vostok). [Edit] References

Rudoy AN Ledoemy and glacier-dammed lakes of the Altai in the Pleistocene / / Proceedings of the All-Union Geographical Society, 1990. - T. 122. - Vol. 1. - S. 43-54. Piotrowski, J. A. Tunnel-valley formation in northwest Germany - geology, mechanisms of formation and subglacial bed conditions for the Bornhoved tunnel valley / / Sedimentary Geology, 1994. - Vol. 89. - P. 107-141. Sevost'yanov DV different-rhythms and trends in the dynamics of moisture in Central Asia / / Proceedings of the Russian Geographic Society, 1998. - T. 130. - Vol. 6. - S. 38-46. Rudoy A. N. Mountain Ice-Dammed Lakes of Southern Siberia and their Influence on the Development and Regime of the Runoff Systems of North Asia in the Late Pleistocene. Chapter 16. - In: Palaeohydrology and Environmental Change / Eds: G. Benito, V. R. Baker, K. J. Gregory. - Chichester: John Wiley & Sons Ltd., 1998. - P. 215-234. ISBN 0-471-984655 Rudoy AN Quaternary ledoemy Mountains of South Siberia / / Materials of Glaciological Research, 2001. - Vol. 90. - S. 40-49. Rudoy AN Giant ripple current (history of research, diagnosis and palaeogeographical significance). - Tomsk: Tomsk State Pedagogical University, 2005. - 228. ISBN 5-89428-195-4 Jerome-Etienne Lesemann, Tracy A. Brennand. Regional reconstruction of subglacial hydrology and glaciodynamic behaviour along the southern margin of the Cordilleran Ice Sheet in British Columbia, Canada and northern Washington State, USA / / Quaternary Science Reviews, 2009. - Vol. 28. - P. 2420-2444. [Edit] topographic

Kurai Basin to the memorial area of Kara-Kol The western edge of Kurai basin, basin pp. Maasheya and Shavlo The central part of the Chui valley from the village. Kosh-Agach, Kurai of the ridge and valley. Bashkaus. Arrows can cause adjacent sheets The central part Uimon depression and a fragment of the axial part of Katun ridge. Arrows can cause adjacent sheets [Edit] References

AN Rudoy Ledoemy (Ledoyoms - ice body): a review. Knol. Retrieved January 30, 2011. Ledoemy Altai Mountains. Keenan Lee. The Altai Flood. Ledoyom. Museum of Learning Explore a Virtual Museum of Knowledge. Ledoyom (Ice body). Medication Information Library. VM Kotlyakov. One hundred meters from the secret (of Antarctic subglacial lake Vostok).

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