AustralieFrV1, Main, Exploration, bibRecord, 000100

Uplift of the central transantarctic mountains.

Identifieur interne : 000100 ( Main/Exploration ); précédent : 000099; suivant : 000101

Uplift of the central transantarctic mountains.

Auteurs : Phil Wannamaker [États-Unis] ; Graham Hill [Nouvelle-Zélande] ; John Stodt [États-Unis] ; Virginie Maris [États-Unis] ; Yasuo Ogawa [Japon] ; Kate Selway [Australie] ; Goran Boren [Australie] ; Edward Bertrand [Nouvelle-Zélande] ; Daniel Uhlmann [France] ; Bridget Ayling [États-Unis] ; A Marie Green [États-Unis] ; Daniel Feucht [États-Unis]

Source :

Nature communications [ 2041-1723 ] ; 2017.

RBID : pubmed:29150611

Abstract

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.

DOI: 10.1038/s41467-017-01577-2
PubMed: 29150611

Affiliations:

Australie, France, Japon, Nouvelle-Zélande, États-Unis
Colorado, Nevada, Utah

Le document en format XML

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<front><div type="abstract" xml:lang="en">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.</div>
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Serveur d'exploration sur les relations entre la France et l'Australie

Uplift of the central transantarctic mountains.

Uplift of the central transantarctic mountains.

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