User:DGShanks/sandbox

Shetland Plate Draft
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Shetland Plate

** The draft article for the Shetland Plate has been moved.**

User:DGShanks/Shetland Plate Draft

Contributions

 * Formation of the plate.
 * Current plate motion.
 * Geologic history of the plate.
 * Relationship to the South Shetland Islands.

Initial Sources
==== Tectonics of the Scotia–Antarctica plate boundary constrained from seismic and seismological data ====

==== Structure of the Bransfield Strait Crust ====

==== Is subduction ongoing in the South Shetland Trench, Antarctic Peninsula? ==== Proposes that the South Shetland Trench is no longer a sub-ducting zone but has become a compaction zone caused by extension in the Bransfield Basin.


 * NE boundry of the South Shetland Trench is the Shackleton Fracture Zone.
 * SW boundary is the Hero Fracture Zone.
 * Subduction slowed 6 Ma then again at 3 Ma
 * South Shetland Islands moving NW at ~1cm/yr relative to Antarctica (Dietrich, 2001) (Can I use this?).

==== Geodynamic reconstructions of the South America–Antarctica plate system ==== A geologic history of the South American and Antarctic Plate systems. Includes the evolution of the small plates surrounding the Antarctic peninsula.


 * 8 Ma Central Scotia spreading ridges stop (West Scotia Ridge) and spreading moves to Sandwich Islands.
 * Phoenix–Antarctica spreading ceased 3 Ma.
 * South Shetland Islands and Bransfield Basin form 3 Ma.
 * 3 Ma slab roll back occurs in South Shetland Trench.

==== Geotectonic evolution of the Bransfield Basin ==== Investigates the extension in the Bransfield Basin using analog models and suggests that the Bransfield Basin is caused primarily by the movement of the Scotia Plate with some passive roll-back subduction present in the South Shetland Trench.

==== Geodetic implications on block formation and geodynamic domains in the South Shetland Islands ==== Geodetic movement of stations in South Shetland Islands, Bransfield Basin, and Antarctic Peninsula are recored and analyzed.


 * Shetland Islands moving NE absolutely.
 * Shetland Islands moving NW relative to Antarctic Plate.
 * 10 mm/year convergence in Shetland Tranch (Dietrich et al., 2001, 2004; González-Ferrán, 1991; Jiang et al., 2009; Taylor et al., 2008).

==== Volcanic and tectonic evolution of the Northern Antarctic Peninsula—Late Cenozoic to recent ==== Goes through the volcanic history of the AN Peninsula and discuss the opening of the Bransfield Rift an other rifts nearby.


 * Multiple types of basalt and igneous plutons in the Shetland Islands.
 * Volcanos in the Bransfield Strait show both calc-alkaline (subduction zone) and mid-ocean ridge lavas.
 * Penguin Island is Alkaline type
 * Deception and Bridgemen Islands are transitional between Alkaline and MORBs.

==== Intermediate-focus earthquakes under South Shetland Islands ====

==== An updated digital model of plate boundaries ====