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The Early Triassic Indosinian orogeny in Vietnam (Truong Son Belt and Kontum Massif); implications for the geodynamic evolution of Indochina
Authors:C Lepvrier  H Maluski  Vu Van Tich  A Leyreloup  Phan Truong Thi  Nguyen Van Vuong
Institution:aLaboratoire de Tectonique, CNRS-UMR 7072, Université P&M Curie, 4, Place Jussieu, 75252 Paris cedex O5;bLaboratoire de Géochronologie, CNRS-UMR 5573-ISTEM-Université Montpellier 2, Place Eugene Bataillon, 34095, Montpellier, France;cNational University of Vietnam, Hanoi, Thanh Xuan Street, Hanoi, Vietnam
Abstract:New structural field data at various scale and 40Ar–39Ar geochronological results, from the basement rocks in the Truong Son belt and Kontum Massif of Vietnam, confirm that ductile deformation and high-temperature metamorphism were caused by the Early Triassic event of the Indosinian Orogeny in the range of 250–240 Ma. A compilation of isotopic data obtained in other countries along the Sibumasu–Indochina boundary broadly indicates same interval of ages. This tectonothermal event is interpreted as the result of a synchronous oblique collision of Indochina with both Sibumasu and South China, inducing dextral and sinistral shearing along E–W to NW–SE and N–S fault zones, respectively. The collision along Song Ma follows the northwards subduction of Indochina beneath South China and the subsequent development of the Song Da zone which in turn was affected by the Late Triassic Indosinian phase of shortening. Within the Indochina plate, internal collisions occurred coevally in the Early Triassic, as along the Poko suture, at the western border of the Kontum Massif.
Keywords:Indochina  Vietnam  Paleotethys  Suture  Indosinian  Tectonic structures  Oblique collision  40Ar–  39Ar ages
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