Magnetotelluric evidence for thick-skinned tectonics in central Taiwan

Edward Bertrand, Martyn Unsworth, Chih Wen Chiang, Chow Son Chen, Chien Chih Chen, Francis Wu, Erşan Türkoǧlu, Han Lun Hsu, Graham Hill

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

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 décollement 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.

Original languageEnglish
Pages (from-to)711-714
Number of pages4
JournalGeology
Volume37
Issue number8
DOIs
StatePublished - 2009

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