THE NARIGONGMA PORPHYRY MOLYBDENUM(-COPPER) DEPOSIT IN QINGHAI PROVINCE: Alteration

The Narigongma porphyry molybdenum(-copper) deposit in Southern Qinghai Province is located in the northern part of Yulong metallogenic belt.Research on the deposit recognizes three types of alteration in the orefield,i.e.K-silicate alteration(biotite-K feldspar),propylitic alteration(chlorite-epidote ± calcite) and feldspar-destructive alteration(sericite ± kaolin ± calcite ± anhydrite).The metallogenesis is closely related to the quartz-molybdenite ± anhydrite ± chalcopyrite ± pyrite vein and molybdenite ± pyrite ± chalcopyrite vein.