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Understanding Mesozoic accretion in Southeast Asia: Significance of Triassic thermotectonism (Indosinian orogeny) in Vietnam

¹ Research School of Geological Sciences, Birkbeck College and University College London, Gower Street, London, WC1E 6BT, UK
² Tectonics Special Research Centre, Department of Applied Geology, Curtin University of Technology, Perth, WA 6845, Australia

Results from a zircon U-Pb study of the metamorphic basement of Vietnam reveal that a large part of the continental crust was affected by a short-lived episode of ductile deformation and high-temperature metamorphism between 258 ± 6 Ma and 243 ± 5 Ma. Although coincident with final stages of North-South China collision (Qinling orogenesis), the thermotectonism in Vietnam was caused by accretion of Sibumasu to Indochina–South China. This accretion event (Indosinian orogeny) has regional significance because it contributed to the final stages of North-South China collision, an aspect not explicitly recognized in Qinling orogenic models.

Key Words: Vietnam • Qinling orogenic belt • Indosinian • U-Pb zircon ages

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