{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1361418519253639552.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.crte.2007.10.005"}},{"identifier":{"@type":"URI","@value":"https://comptes-rendus.academie-sciences.fr/geoscience/item/10.1016/j.crte.2007.10.005.pdf"}}],"dc:title":[{"@value":"Indosinian tectonics in Vietnam"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>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.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381418519253639553","@type":"Researcher","foaf:name":[{"@value":"Claude Lepvrier"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418519253639555","@type":"Researcher","foaf:name":[{"@value":"Nguyen Van Vuong"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418519253639552","@type":"Researcher","foaf:name":[{"@value":"Henri Maluski"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418519253639556","@type":"Researcher","foaf:name":[{"@value":"Phan Truong Thi"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418519253639554","@type":"Researcher","foaf:name":[{"@value":"Tich Van Vu"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"16310713"},{"@type":"EISSN","@value":"17787025"}],"prism:publicationName":[{"@value":"Comptes Rendus. 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