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A tectonic model for Cenozoic igneous activities in the eastern Indo-Asian collision zone

by Jiang Hai Wang, An Yin, T. Mark Harrison, Marty Grove, Yu Quan Zhang, Guang Hong Xie
Earth and Planetary Science Letters ()
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Geochronologic dating and compilation of existing age data suggest that Cenozoic activities in the eastern Indo-Asian collision zone of southeast China and Indochina occurred in two episodes, each with distinctive geochemical signatures, at 42-24 Myr and 16-0 Myr. The older rocks are localized along major strike-slip faults such as the Red River fault system and erupted synchronously with transpression. The younger rocks are widely distributed in rift basins and are coeval with east-west extension of Tibet and eastern Asia. Geochemical data suggest that the early igneous phase was generated by continental subduction while the late episode was caused by decompression melting of a metasomatically altered, depleted mantle. The magmatic gap between the two magmatic sequences represents an important geodynamic transition in the evolution of the eastern Indo-Asian collision zone, from processes controlled mainly by crustal deformation to that largely dominated by mantle tectonics. ?? 2001 Elsevier Science B.V. All rights reserved.

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