Deformation Belt of Ductile Shear from Carbonate Platform in the TianeFengshan Area，Western Guangxi

Abstract

Abstract:

Different degrees of ductile shear deformation have occured from Devonian to Permian in TianeFengshan area, western Guangxi. On the edge of carbonate platform, especially along the specific lithohorizon from Carboniferous and Permian, a set of deformation belt of calcareous ductile shear formed, with features of low metamorphism, strong deformation and stratiform. The ductile shear deformation belts consist in strong, low and middle deformation belts. Under the microscope, it is discovered that the metamorphic and deformation rocks from the the ductile shear deformation belt are charactered by mylonitic texture, and belong to mylonitic series. The deformation belt of the calcareous ductile shear shows the feature of thrust and concluded to form by the mechanism of arccontinent collision in late period of Middle Triassic in TianeFengshan area. The discovery may provide new evidence for the analysis of the formation and development of the Youjiang basin in western Guangxi.

Key words: deformation of ductile shear, deformation belt of calcareous ductile shear, carbonate platform, TianeFengshan area, western Guangxi

ZHANG Nai, LEI Hai-Feng, YAN Yo-Tong, TUN Nian-Dong. Deformation Belt of Ductile Shear from Carbonate Platform in the TianeFengshan Area，Western Guangxi[J]. Geoscience, 2012, 26(4): 696-704.

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