Jurassic dextral movement along the Dien Bien Phu fault, NW Vietnam: Constraints from 40 Ar/39 Ar geochronology

Te Hsien Lin, Chmg Uua Lo, Sun Lin Chung, Pei Ling Wang, Meng Wan Yeh, Tung Yi Lee, Ching Ying Lan, Nguyen Van Vuong, Tran Taan Anh

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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 40 Ar/ 39 Ar geochronological data for mica schists and mylonites from several areas along the Dien Bien Phu fault, showing 40 Ar/ 39 Ar ages of 194-212 Ma for mica schists and 158-198 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.

Original languageEnglish
Pages (from-to)192-199
Number of pages8
JournalJournal of Geology
Issue number2
Publication statusPublished - 2009 Mar 1



  • Color version of figure 2

ASJC Scopus subject areas

  • Geology

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