Jurassic dextral movement along the Dien Bien Phu fault, NW Vietnam: Constraints from 40 Ar/39 Ar geochronology
Resource
The Journal of Geology 117: 192-199
Journal
Journal of Geology
Journal Volume
117
Journal Issue
2
Pages
192-199
Date Issued
2009
Author(s)
Lin, Te-Hsien
Yeh, Meng-Wan
Lee, Tung-Yi
Lan, Ching-Ying
Vuong, Nguyen Van
Anh, Tran Tuan
Abstract
The NNE-SSW-trending Dien Bien Phu fault, which dextrally displaces the NW-SE-trending Song Ma suture, in northwestern Vietnam, is widely considered one of the most seismically active faults in Indochina. In order to better understand the fault��s activity, this study reports new 40Ar/39Ar geochronological data for mica schists and mylonites from several areas along the Dien Bien Phu fault, showing 40Ar/39Ar ages of 194�V212 Ma for mica schists and 158�V198 Ma for mylonites. These ages suggest that after the collision of the South China and Indochina blocks, dextral shearing deformation initiated along the Dien Bien Phu fault in the Jurassic, significantly earlier than previously thought. In light of the relevant tectonic events in Indochina, the successive suturing/collision of the Indochina, Simao, and Sibumasu blocks may have been responsible for the initiation of dextral shearing along the Dien Bien Phu fault, which in turn resulted in offset of the Song Ma suture.
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journal article
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