Abstract
The Wangfeng-Tianger-Saridala gold district consists of over 20 ore bodies and occurs in the EW-trending Tianger shear zone in the western Tianshan Mountains. Shear zone-controlled old mineralization occurs in mylonitized granites and mylonitized sulfide — mica — quartz veins. The ore bodies are composed of gold — bearing mylonitized granites and gold — bearing sulfide — quartz veins in the central part of the Tianger shear zone. Gold grade strongly correlates with the abundance of sulfide — quartz veins. Native gold grains are rarely found in adjacent wall rocks. Pyrite and pyrrhotite in gold — bearing sulfide — quartz veins contain native gold inclusions. Chondrite-normalized rare earth element (REE) distribution patterns for pyrite from orebodies show apparent light REE enrichment and negative Eu anomalies. The relations between gold contents and Th/U, Zr/Hf and (La/Yb)N values for pyrite imply that the gold-rich pyrite is different from the gold-poor pyrite, and thus indicates that pyrite in ore-body has a different origin when compared with pyrite in wall rocks. Gold has been introduced syn-deformationally during a period of ductile-brittle shear development. A Rb-Sr isotopic isochrone composed of 4 mica samples, 1 quartz sample, and 5 whole rock samples in mylonitized gold-bearing quartz veins produces one isochrone age of 224 ± 14 Ma with an initial 86Sr/87Sr ratio of 0.7294 ± 0.0089 (MSWD = 1.1).
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