Thermochronology of cordilleran metamorphic core complexes: example of Song Chay massif in Northern Vietnam

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Abstract

Based on the reconstruction of the thermal evolution of the Song-Chai granitoid massif (Northern Vietnam) the long-term existence of granitoid magma at deep levels of the Earth’s crust (H = 15-20 km, Δt ~ 20-50 Ma) is established. Geodynamic analysis and mathematical modeling of thermal history of the granitoid batholith cooling shows that the magmatic chamber should be considered as thermal trap on the lower level of the earth’s crust, preserving residual granite melts for a long time. Activation of the magmatic chamber occurs in post-collisional strike-slip tectonics zones and is associated by tectonic exhumation of large segments of the earth’s crust. Ultimately, this leads to the transformation of the batholith into Cordilleran type metamorphic core complexes, emplacement of residual rare-metal melts and the formation of commercial deposits.

About the authors

A. G. Vladimirov

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University; Tomsk State University

Author for correspondence.
Email: vladimir@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090; 1, Pirogova street, Novosibirsk, 630090; 34a, Lenina prospect, Tomsk, 634050

A. V. Travin

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University; Tomsk State University

Email: vladimir@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090; 1, Pirogova street, Novosibirsk, 630090; 34a, Lenina prospect, Tomsk, 634050

Phan Luu Anh

Institute of Geological Sciences, Vietnam Academy of Science and Technology

Email: vladimir@igm.nsc.ru
Viet Nam, 84, Chua Lang, Dong Da, Hanoi

N. G. Murzintsev

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: vladimir@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090

E. I. Mikheev

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: vladimir@igm.nsc.ru
Russian Federation, 3, Koptyug prospect, Novosibirsk, 630090; 1, Pirogova street, Novosibirsk, 630090

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