A Preliminary study on the Geochronology of the host rocks of the Supergiant Gejiu Tin Deposit, SW China

AUTHORS: Cheng Yanbo, Mao Jingwen

Gejiu is the largest polymetallic tin ore field in the world. It has been known as a granite-related deposit for a long time. The igneous rock series in the ore field comprises gabbro, diorite, granite, alkaline rocks and lamprophyre. Precise zircon U-Pb dating indicates that the intrusions formed mainly in an age range of 76 to 85 Ma. We propose that the granite-related polymetallic tin deposits in the Gejiu ore district are part of the large-scale W-Sn mineralization and related-magmatism of the southeastern Yunnan and western Guangxi provinces, southwest China. Moreover, we also suggest that they were formed in association with lithospheric thinning occurred in Southwestern China during the Cretaceous.

KEYWORDS: Granite; zircon U-Pb age; lithospheric thinning;

EAN: SGA_2009_A102
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