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The Indosinian orogeny: A perspective from sedimentary archives of north Vietnam

Rossignol, Camille
Bourquin, Sylvie
Hallot, Erwan
Poujol, Marc
Dabard, Marie-Pierre
Villeneuve, Michel
Cornée, Jean-Jacques
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Published in Journal of Asian Earth Sciences. 2018, vol. 158, p. 352-380
Abstract The Triassic stratigraphic framework for the Song Da and the Sam Nua basins, north Vietnam, suffers important discrepancies regarding both the depositional environments and ages of the main formations they contain. Using sedimentological analyses and dating (foraminifer biostratigraphy and U-Pb dating on detrital zircon), we provide an improved stratigraphic framework for both basins. A striking feature in the Song Da Basin, located on the southern margin of the South China Block, is the diachronous deposition, over a basal unconformity, of terrestrial and marine deposits. The sedimentary succession of the Song Da Basin points to a foreland setting during the late Early to the Middle Triassic, which contrasts with the commonly interpreted rift setting. On the northern margin of the Indochina Block, the Sam Nua basin recorded the activity of a proximal magmatic arc during the late Permian up to the Anisian. This arc resulted from the subduction of a southward dipping oceanic slab that separated the South China block from the Indochina block. During the Middle to the Late Triassic, the Song Da and Sam Nua basins underwent erosion that led to the formation of a major unconformity, resulting from the erosion of the Middle Triassic Indosinian mountain belt, built after an ongoing continental collision between the South China and the Indochina blocks. Later, during the Late Triassic, as syn- to post-orogenic foreland basins in a terrestrial setting, the Song Da and Sam Nua basins experienced the deposition of very coarse detrital material representing products of the mountain belt erosion.
Keywords Indochina blockSouth China blockForeland basinForaminifersSong Da BasinSam Nua basin
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Research group Sedimentology, Biostratigraphy and Micropaleontology
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ROSSIGNOL, Camille et al. The Indosinian orogeny: A perspective from sedimentary archives of north Vietnam. In: Journal of Asian Earth Sciences, 2018, vol. 158, p. 352-380. https://archive-ouverte.unige.ch/unige:104015

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Deposited on : 2018-05-02

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