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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Indosinian tectonics in Vietnam</title>
<creator>Lepvrier, C.</creator>
<creator>Van Vuong, N.</creator>
<creator>Maluski, Henri</creator>
<creator>Thi, P. T.</creator>
<creator>Van Vu, T.</creator>
<contributor>Laboratoire de tectonique (LT) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Cergy Pontoise - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Faculty of Geology [Hanoi] ; Hanoi University of Science and Technology (HUST)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<source>ISSN: 1631-0713</source>
<source>Comptes Rendus Géoscience</source>
<publisher>Elsevier Masson</publisher>
<identifier>hal-00411591</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00411591</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00411591</source>
<source>Comptes Rendus Géoscience, Elsevier Masson, 2008, 340 (2-3), pp.94-111. 〈10.1016/j.crte.2007.10.005〉</source>
<identifier>DOI : 10.1016/j.crte.2007.10.005</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.crte.2007.10.005</relation>
<language>en</language>
<subject lang=en>Indochina</subject>
<subject lang=en>Indosinian</subject>
<subject lang=en>shear zones</subject>
<subject lang=en>suture</subject>
<subject lang=en>oblique subduction</subject>
<subject lang=en>collision</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>In Vietnam, the Triassic Indosinian collision affected coevally the Truong Son belt and the Kontum Massif,which were not independent tectonic units, but parts of the same Gondwana-derived Indochina continental block. This thermotectonic event took place synchronously throughout Vietnam, during the Lower Triassic 250-240-Ma time interval, as demonstrated by numerous geochronological data, combining Ar-Ar and U-Pb dating methods. Structural and kinematic investigations, in the Indosinian metamorphic rocks, reveal that the collisional process resulted from a consistent northwest-striking convergence of Indochina with respect to the adjacent blocks. It is suggested that this motion was taken up by a pair of opposite subduction zones: to the north, beneath South China, and to the west, beneath western Indochina, along the Song Ma and Po Ko sutures, respectively. Tectonic markers, calc-alkaline subduction-related volcanism and granitic intrusions and the generation of high-pressure rocks that have been recently discovered support this geodynamic setting, at least along Po Ko. Along the northwest-trending Song Ma zone, the obliquity of the convergence during subduction and subsequent collision resulted in the development, within the Truong Son Belt, of a set of subparallel dextral mylonitic shear zones, under amphibolite-facies metamorphism. The intermediate segments remained weakly metamorphic or even almost devoid of metamorphism. Along Po Ko, the convergence was near-orthogonal, with a left-lateral strike-slip component; the ongoing continental subduction resulted in the reworking of the Kontum granulitic basement and the development of Indosinian HP granulitic conditions; the subsequent extension-related exhumation operated approximately in the same northwestwards direction. This Indosinian evolution, applied on a continental crust that had been probably affected, as in South China, by a Caledonian-related event, as judged by the general unconformity of the Lower Devonian sediments, the widespread occurrence of magmatic crystallisation ages of ca 450 Ma (Ordovician-Silurian), and by the approximately similar age of the primary granulitic episode in the Kontum Massif. The similarities of the Devonian facies over central, northern Vietnam and South China imply a land connection, possibly as a consequence of a Caledonian collision along Song Ma, but this does not preclude a further oceanic opening and a closure during the Indosinian.</description>
<date>2008</date>
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