Dating palaeo-seismic faulting in the Taiwan Mountain Belt

Chih Tung Chen, Chieh Yu Wu, Ching Hua Lo, Hao Tsu Chu, Tzen Fu Yui

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In-situ 40Ar/39Ar laser microprobe dating was carried out on the Hoping pseudotachylite from a mylonite-fault zone in the metamorphosed basement complex of the active Taiwan Mountain Belt to determine the timing of the responsible earthquake(s). The dating results, distributed from 3.2 to 1.6 Ma with errors ranging from 0.2 to 1.1 Ma, were derived from a combination of two Ar isotopic system end-members with inverse isochron ages of 1.55 ± 0.05 and 2.87 ± 0.07 Ma, respectively. Petrographical observations reveal fault melt containing ultracataclasites, therefore the older inverse isochron end-member may be attributed to the relic wall rock Ar isotopic system contained in micro-breccia. Without significant Ar loss expected, the ~1.6 Ma for the young end-member defines the exact time of the pseudotachylite formation. Seismic faulting therefore occurred during basement rock exhumation in the Taiwanese hinterland.

Original languageEnglish
Pages (from-to)146-151
Number of pages6
JournalTerra Nova
Volume30
Issue number2
DOIs
StatePublished - Apr 2018

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