Petrogenesis and Tectonic Significance of the Xiuwacu Two-Period Magmatism in Geza Arc of Yunnan Province: Constraints from Lithogeochemistry, Zircon U-Pb Geochronology and Hf isotopic Compositions

摘要

Objective The Late Cretaceous Xiuwacu ore-bearing porphyry is located in the Geza area of southern Yidun arc,SW China.In this area,the rock mass is mainly composed of three lithofacies:biotite granite porphyry,monzonitic