Uplift of the central transantarctic mountains

被引：0

作者：

Phil Wannamaker

Graham Hill

John Stodt

Virginie Maris

Yasuo Ogawa

Kate Selway

Goran Boren

Edward Bertrand

Daniel Uhlmann

Bridget Ayling

A. Marie Green

Daniel Feucht

机构：

[1] University of Utah/Energy & Geoscience Institute,Tokyo Institute of Technology

[2] University of Canterbury,Department of Earth and Planetary Sciences

[3] Gateway Antarctica,Department of Geology & Geophysics

[4] Antarctica Scientific Ltd,Department of Geology & Geophysics

[5] Formerly at GNS Science,Department of Geological Sciences

[6] Natural Hazards Division,undefined

[7] Numeric Resources LLC,undefined

[8] Volcanic Fluid Research Center,undefined

[9] Macquarie University,undefined

[10] University of Adelaide,undefined

[11] GNS Science,undefined

[12] Natural Hazards Division,undefined

[13] First Light Mountain Guides,undefined

[14] Great Basin Center for Geothermal Energy,undefined

[15] University of Nevada,undefined

[16] University of Utah,undefined

[17] University of Colorado,undefined

来源：

Nature Communications | / 8卷

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摘要：

The Transantarctic Mountains (TAM) are the world’s longest rift shoulder but the source of their high elevation is enigmatic. To discriminate the importance of mechanical vs. thermal sources of support, a 550 km-long transect of magnetotelluric geophysical soundings spanning the central TAM was acquired. These data reveal a lithosphere of high electrical resistivity to at least 150 km depth, implying a cold stable state well into the upper mantle. Here we find that the central TAM most likely are elevated by a non-thermal, flexural cantilever mechanism which is perhaps the most clearly expressed example anywhere. West Antarctica in this region exhibits a low resistivity, moderately hydrated asthenosphere, and concentrated extension (rift necking) near the central TAM range front but with negligible thermal encroachment into the TAM. Broader scale heat flow of east-central West Antarctica appears moderate, on the order of 60–70 mW m−2, lower than that of the U.S. Great Basin.

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