User:AlexanderKoldewey/sandbox

Article evaluation: Merensky Reef

There is much information that is lacking and can be added onto the subheading of the article. 1. Formation theory on Bushveld and further specifically Merensky Reef can be developed. 2. Structural make-up of the Merensky reef can be developed (Its thickness is not mentioned (20-25cm thick), rests on a footwall or norite to andesite composition) 3. Estimated worth of resources held within the reef and further segregated into chromite, PGE's and so on.. 4. Development of historic and current exploration and mining work being done on the Reef 5. Petrology could be elaborated on (no mention of sulphide bearing, in upper critical zone of the Bushveld), the distribution of minerals are very poorly mentioned) 6. Enrichment process is not evaluated.

The article appears to remain neutral however, very little is spoken about the topic in question itself. It can get distracting as it develops into other ideas such as the UG2 deposit and chromite formation. Doing so, has developed ideas on topics that may be relevant to the topic in question, however have elaborated far more into these topics than that of the Merensky reef itself. (which is something that seriously needs to be addressed if the page were to be a good source of information for future viewers).

The article states that it holds most of the the world's PGE concentration: As it may be a large deposit, new discoveries could be made which eventually would falsify the statement. A small mention of the history (neutral) however, perhaps again could be elaborated on (not main focus as the points above however from a geologically significant stand-point). In general the article is neutral but requires more geological facts.

One citation has already been corrected by me, as there was a fuel cell link that was no longer available. The actual link has been found. In general the article lacks citation which indicates very little research has been done on the Merenky Reef. Additional critques to analyze different sources would contribute greatly to the article.

Furthermore, the citations in use are relatively moderate to poor sources of information. One(they) appear to be simple websites with no evident author and no sources where they go their information on. Which concludes that the little information that currently occupies the Mersenky Reef article should be subject to much scrutiny and fact checking. However, they do not appear to be biased which is positive.

The talk page on the cite also appears to have very little activity. Additional conversations/arguments could be added. One point in the talk includes a question "Is the Merenksy Reef underwater?." The reef does not refer to an underwater bio activity. The reef refers to large localized concentrations of quartz?.

There is also a portion of the article that includes the UG2 reef, as it is also a very important component of the Bushveld complex, as they together, with the Merenksy reef boasts the, or one of the largest PGE concentrations in the world, it is has very little purpose within the Mersenky Reef article. Additional information should be included on and solely on the Merensky reef. Therefore UG2 Reef is over represented in this short article compared to the Merensky Reef which is underrepresented and should be the main focus point.

"This article has been rated as Start-Class on the project's quality scale. This article has been rated as Mid-importance on the project's importance scale. Additional information needs to be added. It appears that the topic in question was not written from someone of a geological background therefore significant information concerning the petrology, geophysics, etc is lacking. Extra sources bellow are linked bellow." - Pulled from the talk page which, Wikipedia agrees with my affirmations on the article.

The current Merensky Reef on Wikipadiea discusses the article as a very blurry representation of what it actually is, going into the very basics followed by the UG2 Reef and then going into the history of its discovery. In mineral deposits it has been discussed going far more in depth into its mineralogy and developed more into the subject from a geologic standpoint. In Resources of the Earth, it has not yet been discussed.

Additional Links to the Merensky Reef have been added bellow:

General: https://academic.oup.com/petrology/article/43/1/103/1399833 https://academic.oup.com/petrology/article/41/4/545/1455634

Formation: https://link.springer.com/content/pdf/10.1007%2FBF00307287.pdf https://academic.oup.com/petrology/article/48/8/1569/147307 3

Wiki Project: Tengchong Volanic Field
The current Wikipedia page evaluating the topic in question is lacking in every aspect. There is much to be added. Ill begin by doing a general research that will formulate my main talking points. It will be these points that will m=be most likely be added onto the first introduction paragraph. Them ill research into the geology of the locality and include it in a subheading. Preliminary research has lead me interested in the emissions resulting from the volcanic region. --> Perhaps global or local consequences of the CO2 emmisions can be researched and talk about A history could also be included after discussing the geology. ---After further research i'm confident more ideas can be added onto the topic.

Leading Paragraph
The Tengchong Volcanic Field (TVF) is a Cenozoic volcanic field located at the Southeastern margin of the Tibetan Plateau.....'Add parts of existing text'. The TVF is uniquely the only region affected by Quaternary volcanism that is part of the Himalayan Geothermal Belt caused by the Indo-Asian continent-continent collision. The TVF is characterized by hydrothermal activity and large-scale eruptions last recorded in 1609CE. Although the volcanoes themselves are considered extinct, several geothermal fields geographically linked to the TVF are highly active. Evidence for geothermal activity can be linked to several prevalent active hot-springs located predominantly within the the vicinity of the volcanoes in the TVF Holocene eruptions occurred predominantly in the three largest and still active volcanoes in the TVF named the Dayingshan, Maa'nshan and Heikongshan, the highest of which (Dayingshan) reaches 2865 meters above sea level. The volcanoes are distributed in a string-like pattern clustered from North to South in the middle on the Tengchong basin. Post-collisional high-Potassium (K) calc-alkaline series characterize eruptions from the TVF. The TVF provides unique geographical and geological knowledge. Understanding the geological processes of creation provides insight into aspects such as the history of volcanism during the Quaternary Era in the region and as well as compositional information of the it's source and crustal assimilants.

Geology
General Overview and History

There are a total of 68 volcanoes and 58 hot springs in the TVF all derived from the Quaternary Era. The volcanoes in the TVF are typically concentrated in clusters along a string-like north-south pattern. Of the 68 volcanoes, three that are still considered active today based on their measured geothermal activity. These volcanoes are Maanshan (Saddle Peak), Heikonshan (Black Emptied Peak), and Dayinshan; Dayingshan being oldest of the three volcanoes and last erupted in CE1609 as documented by Chinese geographer Xu Xiake (1587-1641)  The TVF is a product of one of the most important events that transpired in the Cenozoic Era, the Indo-Asian continent-continent collision which occurred 59Ma. The result of the collision was the uplift of the Tibetan Plateau along with Asian continent acidification (the release of CO2 due to volcanic activity), global climate change, tectonism and volcanic activity associated with the TVF. Prior to continent collision during the Paleozoic, the Tengchong block was located along the Indian margin of the Gondwana. High resolution tomographic data revealed evidence for an eastward under thrusting of the Indian continental lithosphere into the asthenospheric mantle underneath the TVF. This indicates that prior to continent collision, the Tengchong block along with the Burma block overlaid the subducted Neo-Tethyan oceanic lithosphere

Petrology and Peterogenesis

The TVF is predominantly composed of volcanic rocks that follow a high potassium calc-alkaline (HKCA) suite formed by post-collisional continent subduction of the Indian slab and regional extension (Extensional tectonics). The rocks found in this region are basalt, dacite welded tuff, basaltic trachyandesite and trachyandesite. These extrusive rocks where extruded out as lava flows and pyroclastic material. The origin of the rocks present in the TVF can be categorized into three eruption stages deduced by systematic K-Ar Dating. (1) Basalt and olivine basalt forming during the late Miocene to Pliocene (5.5-4.0Ma and 3.8-0.9Ma) (2) Acid rocks (silicic igneous rocks) forming in the Pleistocene (0.8-0.1Ma). (3) Basalt and intermediate-acid rocks form during the late Pleistocene to Holocene (0.1-0.01Ma). The largest widespread volcanic distribution is characterized by the rocks forming during the Pleistocene (2) indicating that volcanic activity was greatest during this phase.

Andesitic lavas comprise the most recent volcanic rocks. The basement rocks are dominantly composed of Precambrian metamorphic rocks underlain by sedimentary and igneous rocks including limestones, sandstones, mudstones, and granitoids followed by volcanic-sedimentary sequences. As time progresses towards the last eruptions, volcanic rocks MgO decrease in content whereas the K2O content increases. Chemical variations in HKCA suite exist due to derived petrological variations in the rocks. This includes partial melting of an enriched primitive mantle derived magma source by subducted clay-rich sediments which formed the trachybasalts (a volcanic rock with a composition between trachyte and basalt) followed by mantle-derived magmas forming the basaltic trachyandesites and trachyandesites originating from the lower crust by from a process called assimilation-factional crystallization (A process by which magma crystallizes with the addition of crustal material inside the magma chamber and/or the conduit of which the magma flows through).

Structure

The TVF is located as what is known as the Tengchong block which is simply a region that is an extension of the southern Tibetan Plateau. The Tengchong block is bounded by the Sagaing Shear Zone and the Tsangpo Suture located to the West and the dextral strike-slip Gaoligong shear zone located to the East, the Ruili fault to the southeast. The India-Asian continent collision created a fault system present at the TVF that is predominantly comprised of north-south trending strike-slip faults. The strike-slip fault system in the TVF includes the major faults such as the Longchuanjinang Fault, the Binlanghinag Fault and Dayingjiang Fault.

Current Geothermal Activity

The Rehai Geothermal Field (RGF) is largest and most active geothermal fields in the TVF. A low-velocity zone indicated by seismic surveys and a highly conductive body recorded by magnetic surveys underlie recent volcanoes located in the RGF providing evidence of an active crustal magma chamber. Present-day hydrothermal activity including hot springs in the TVF are fueled by heat generated for the RGF. In addition, seismic data indicates that the magma chamber is instable. > The instability of the magma chamber beneath the TVF indicates a potential risk for future eruptions..

Magma-derived CO2 emissions of Tengchong Volcanic Field
The TVF is a contributor to global climate change. Emissions of CO2 have been calculated to be around 4.48 x 106ta-1 to 7.05 x 106ta-1 of total flux outgassing. > These emissions play a significant role in global climate change because of two main counter-acting reasons. The uplift of the TVF sequesters carbon because soil production is faster atop mountain ranges. Soil removes carbon dioxide from the atmosphere by trapping atmospheric carbon dioxide in limestone. However in contrast, syn-collisional volcanism, post-collisional volcanism, subduction zone metamorphism and present-day hydrothermal activity in the TVF results in augmented levels of global carbon by releasing it as atmospheric carbon dioxide.

Pamela's Peer Review - The Tengchong Volcanic Field
First of all, good job on providing a good summary of all the talking points you wanted to improve on your article! The first thing that I would suggest you do is to cite all your sources correctly. This would make reading/editing your article a lot easier. Along with this, I would also recommend you start a 'References' section. I also recommend you linking your words to other articles in Wikipedia; for example in the Leading Section I would link words like 'Tibetan Plateau' and the three largest volcanoes that you mention, etc. You are using a couple of 'advanced' geological terms all over your article (i.e. 'continent acidification', 'high pottasium calc-alkaline', 'trachyandesite', etc.) so I would suggest either expanding on these terms and adding an explanation, or linking them to their respective Wiki page to make it easier for the reader to understand the more advance explanations.

The information your have added is good and unbiased, but I would reword or add a couple of sentences to make ideas flow better. For example in your Leading Section the sentence I made bold seems out of place. You should add one or two sentences expanding on this.

Also, in your Leading Section try to add a sentence or two on what the importance of this topic is. Make sure you provide a brief summary or a link to everything else that is discussed in the rest of the article, since the Leading Section is supposed to be a summary of the most important information.

Make sure that you keep naming consistent: either refer to it as "Tengchong Volcanic Field" or "TVF". Right now you are using both all over the article so make sure you use one or the other just for consitency.

" Dayingshan is oldest of the three volcanoes and last erupted in CE1609 as documented by Chinese geographer Xu Xiake (1587-1641) < https://www-sciencedirect-com.proxy.library.carleton.ca/science/article/pii/S1367912002000810?_rdoc=1&_fmt=high&_origin=gateway&_docanchor=&md5=b8429449ccfc9c30159a5f9aeaa92ffb&ccp=y> The crust averages 40 kilometers thick in this region" <--- I would add some sort of link between these two sentences. Its a little bit choppy. Also, what do you mean by "this region"-make sure you make it clear what region you are referring to.

Moving on to your Petrology and Petrogenesis section:

I recommend re-wording "There extrusive rocks were extruded out..." to avoid saying "extruded" twice.

What exactly do you mean by 'Acid rocks'? Do you mean acidic instead?

"volcanic rocks MgO decrease in content whereas the K2O content increases" <-- Explain what the significance of this is.

"This includes partial melting of an enriched primitive mantle derived magma source by subducted clay-rich sediments which formed the trachybasalts followed by mantle-derived magmas forming the basaltic trachyandesites and trachyandesites originating from the lower crust by from a process called assimilation-factional crystallization" <-- I suggest simplifying this, it might be a little bit too technical for Wiki.

Lastly, I would suggest just going over spelling and sentence structure to make sure things flow better.

Sorry if this is an overwhelming amount of edits! I hope they are helpful! Great article Alex, good work!

Jessica's Peer Review for The Tengchong Volcanic Field
Great work so far! You have a lot of content, I'm impressed. A few things I might add to review are just a few common grammar errors, for example in your sentence above, you missed 'there are' in "Of the 68 volcanoes, there are three that etc etc..". Of course this is your rough draft so that's totally fair.

I might want to suggest taking advantage of some wikipedia features such as linking some of the subjects you discuss to other wikipedia pages, for example: "Himalayan geothermal belt, primitive mantle, Tibetan Plateau, etc. I think this becomes very important in sections where you mention a geologic time period, to avoid explaining what the time period represents. (ex: Holocene.)

Additionally, since the geology section of our articles are usually pretty intensive ("high potassium calc-alkaline (HKCA) suite formed by post-collisional continental subduction of the Indian slab and regional extension") I think it would be fair to simplify some complex geological concepts a little more, or explain a little more in detail so that all levels of students can understand. I would advise against explaining TOO much though, as wikipedia has many other pages to help learn the more difficult concepts discussed in our geological sections.

On the subject of neutrality I would avoid words like "iconically" because iconic implies that this is popular opinion, rather than fact. Who believes the volcanoes are iconic? Why iconic and not just important? (Just some things to think about).

On the subject of your references, I think it's fantastic that you've been using primarily scientific papers - this is research and you've been using facts so that's great!I also agree with Pamela: when you're ready, try to translate them to references - it'll be much clearer for you to see if your article flows. :) Good luck! Jessicanajera (talk) 21:24, 8 March 2018 (UTC)