Magnetotelluric evidence for thick-skinned tectonics in central Taiwan

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27536

Title:	Magnetotelluric evidence for thick-skinned tectonics in central Taiwan
Authors:	Bertrand,E;Unsworth,M;Chiang,CW;Chen,CS;Chen,CC;Wu,F;Turkoglu,E;Hsu,HL;Hill,G
Contributors:	地球物理研究所
Keywords:	SAN-ANDREAS FAULT;1999 CHI-CHI;SOUTHERN TIBET;CRUSTAL FLUIDS;NEW-ZEALAND;EARTHQUAKE;HIMALAYA;BENEATH;OROGEN;TENSOR
Date:	2009
Issue Date:	2010-06-29 18:40:30 (UTC+8)
Publisher:	中央大學
Abstract:	Taiwan is the type example of an arc-continent collision. Numerous tectonic models have been proposed for this orogen, and include both thin-skinned and thick-skinned lithospheric deformation. These models predict very different structures at middle and lower crustal depths, but insufficient geophysical data exist to unequivocally distinguish between them. Long-period magnetotelluric (MT) data were collected in central Taiwan in 2006-2007 to constrain the crustal resistivity structure. A two-dimensional inversion of these MT data revealed a prominent electrical conductor that extends across the decollement predicted by the thin-skinned model. This feature is interpreted to be due to 1%-2% saline fluids, and is inconsistent with the thin-skinned model. In contrast, the thick-skinned model predicts this feature since fluids are generated in the crustal root through metamorphism. Quantitative correlation of the resistivity and seismic velocity models supports small-volume, high-salinity fluids in a thickened crust as the cause of this conductor.
Relation:	GEOLOGY
Appears in Collections:	[Graduate Institute of Geophysics] journal & Dissertation

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