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《Mineral Deposits》 2003-03
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Metallogenetic Epoch of Gangdese Porphyry Copper Belt and Uplift of Qinghai-Tibet Plateau

Rui Zongyao 1, Hou Zengqian 1, Qu Xiaoming 1, Zhang Lisheng 2, Wang Longsheng 1 and Liu Yulin 3 (1. Institute of Mineral Resources, CAGS, Beijing 100037, China; 2. Chendu Institute of Geology and Mineral Resources, CAGS, Chengdu 610082, Sichuan, China; 3. Department of Geology, Peking University, Beijing 100871, China)  
Zircon samples from the Qulong quartz monzogranite porphyry in the Gangdese porphyry copper belt, from the Chongjiang monzogranite porphyry and from the Chongjiang diorite porphyrite give SHRIMP U-Pb ages of (17.58±0.74) Ma, (15.60±0.52) Ma and (14.54±0.65 Ma), respectively. K-Ar ages for K-feldspathic alteration of the mineralized porphyry in the Qulong porphyry copper deposit and in the Chongjiang porphyry deposit are (16.43±0.31) Ma and (15.77±0.45) Ma, respectively, while Re-Os ages for molybdenite from ores of these two deposits are (15.99±0.32) Ma and (14.85±0.69) Ma, respectively. Thus the metallogenic ages for the Qulong and the Chongjiang porphyry copper deposits are constrained between (17.58±0.74) Ma and (14.85±0.69) Ma. From strongly mineralized Qulong quartz monzogranite porphyry through intermediately mineralized Chongjiang monzogranite porphyry to barren Chongjiang diorite porphyrite, the SHRIMP U-Pb ages of zircon become younger and younger, and the radiating 206Pb, U and Th contents grow higher and higher. This suggests that the intensity of mineralization decreases wtih the mixture of curst material. Variations in δ 18O values of foraminifera at the bottom of the Atlantic Ocean and in sedimentation rate on submarine sedimentary fans in the north Indian Ocean indicate that mineralizations in the Yulong and the Gangdese porphyry copper belts were related respectively to the Gangdisê and the Hemalayan movements. The SHRIMP U-Pb ages of zircon from host rocks in the Yulong prophyry copper belt vary from (40.9±0.1) Ma to (35.0±0.52) Ma, while the SHRIMP U-Pb ages of zircon from host rocks in the Gangdese porphyry copper belts range between (17.58±0.74) Ma and (15.60±0.52) Ma.
【Fund】: 国土资源部大地调项目 (199910 2 0 0 2 46);; 国家重点基础研究发展规划 (2 0 0 2CB412 60 10 )项目的资助
【CateGory Index】: P618.41
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