A tectonic model for Cenozoic igneous activities in the eastern Indo–Asian collision zone
- ISSN: 0012821X
- DOI: 10.1016/S0012-821X(01)00315-6
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.