Miocene emplacement and deformation of the Konga Shan granite (Xianshui He fault zone, west Sichuan, China): Geodynamic implications

Details Miocene emplacement and deformation of the Konga Shan granite (Xianshui He fault zone, west Sichuan, China): Geodynamic implications Miocene emplacement and deformation of the Konga Shan granite (Xianshui He fault zone, west Sichuan, China): Geodynamic implications

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.130..201r&link_type=abstract

Earth and Planetary Science Letters, vol. 130, Issue 1-4, pp.201-216

Computer Science

18

Scientific paper

The presently active sinistral Xianshui He strike-slip fault (XSH) is a lithospheric scale strike-slip fault in the eastern Himalaya. In the study area this fault affects the eastern edge of the Konga Shan granitic massif, where it has caused both brittle and ductile deformation. A Rb-Sr isochron and Nd and Pb isotope study of three samples, and a U-Pb zircon study of a single sample, were completed on the granite. U-Pb data indicate a granite emplacement age of 12.8 ± 1.4 Ma. The Rb-Sr isochrons show that the granite emplacement and the deformational event were synchronous, at around 12-10 Ma (minimum age for deformation). The Nd and Pb isotope compositions of whole rocks and K-feldspars indicate the involvement of Proterozoic continental crust, which is confirmed by U-Pb systematics indicating inherited zircons. Sinistral faulting along the XSH began at the latest at 12 Ma and marks the extrusion toward the east of the West Sichuan and South China blocks, following their extrusion along the Red River fault zone between 50 and 21 Ma.

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