Giant Blob of Hot Rock Hidden Under Antarctic Ice

Dec 10, 2013 Full story: LiveScience

A big, hot blob hiding beneath the bottom of the world could be evidence of a long-sought mantle plume under West Antarctica, researchers said Monday here at the annual meeting of the American Geophysical Union.

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“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#1 Dec 11, 2013
W. Antarcca is a backarc basin similar to yhe basin & range. The Hotspot driving backarc spreading is under the Mt.Erebus region.

The volcanoes in the W. Antarctic peninsula are the result of backarc spreading with magma incorporated into fractures @ the base of the crust during crustal relaxation immediately after megathrust earthquakes @ the W. Antarctic peninsula where it subducts the Phoenix plate.

Transfer of magma along the fractures at the rifts in the backarc results in the volcano chains where the least compressed part of the rift buts up against the edge of the backarc basin where the W. Antarctic peninsula becomes part of the W. Antarctic plate. The low velocities & residual heat are the result of magma remaining in the fracture set under the volcano.

The volcano chains within the peninsula are the result of the triangular shape of the phoenix plate which is gradually thinning as Antarctica moves toward Patagonia.

The situation resembles the basin & range.

Have a nice day: Ag

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