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• W2794493805 abstract "The timing, spatial pattern and mechanisms that controlled the biotic recovery following the endPermianmass extinction, during the Early and Middle Triassic, are still under debate. In South East Asia (SEA), anEarly Triassic biotic recovery has been documented in both terrestrial and marine ecosystems. SEA thusappears as a key area to document how life recovered after the end-Permian mass extinction. However, someaspects of the paleogeography and geodynamic evolution of SEA during the late Permian to the Late Triassic,those are likely to have influenced the biotic recovery in this area, remain debated. The debates concern, inparticular, the formation of the Indosinian mountain belt that resulted from the continental collision betweenthe South China and Indochina blocks, representing the main plates that composed SEA at that time.Sedimentary basins, through the sedimentary successions and the nature of the deposits, reflect thegeology of the area from which the sediments were derived and provide valuable record of hinterlandtectonism. To document the building of the Indosinian mountain belt and associated paleoenvironments, weinvestigated two sedimentary basins: the Sam Nua and the Song Da basins (present-day northern Vietnam),located, respectively, to the south and to the north of the inner zones of the Indosinian orogen (i.e., the NamCo and the Song Ma units). Using sedimentological and dating analyses (foraminifers biostratigraphy and UPbdating on detrital zircon), we provide a new stratigraphic framework for these basins and propose ageodynamic evolution of the present-day northern Vietnam.During the late Permian to the Early Triassic, the Sam Nua Basin was opened to marine influences, andwas mainly supplied by volcaniclastic sediments originating from an active volcanic activity. Geochemicalinvestigations, combined with sedimentological and structural analyses, support an arcrelated setting for thismagmatism, indicating the presence of a continental arc on the northern margin of the Indochina plate. Duringthe Middle to the Late Triassic, the Sam Nua Basin underwent erosion that lead to the formation of a majorunconformity resulting from the dismantling of the Indosinian Truong Son belt, built after the continentalcollision between the South China and the Indochina blocks. The sedimentation resumed at the end of the LateTriassic, with the deposition of very coarse material, emplaced under continental setting in a syn-to postorogenicforeland basin. To the north, the Song Da Basin is characterized by strongly diachronous formations,deposited during the Early and the Middle Triassic over a basal unconformity. These formations correspondto marine platform limestone and continental deposits, and represent the infilling of a foreland basin. Together,the Song Da and Sam Nua basins thus document the geodynamic evolution and the paleogeography of SEAduring the late Permian to the Late Triassic. The South China and the Indochina blocks were separated by anoceanic domain, that closed progressively until the Middle Triassic and resulted in the formation of theIndosinian mountain belt. These highly dynamic tectonic changes were associated with paleoenvironmentvariations that have likely impacted the biosphere turnover during the Triassic." @default.
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• W2794493805 date "2017-10-10" @default.
• W2794493805 modified "2023-09-27" @default.
• W2794493805 title "LATE PERMIAN TO LATE TRIASSIC PALEOGEOGRAPHIC EVOLUTIONOF THE SOUTH CHINA AND INDOCHINA BLOCKS, SOUTH EAST ASIA" @default.
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