| 西藏甲玛铜多金属矿硫同位素地球化学研究 |
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| 关键词:Sulfur isotope sulfide porphyry Jiama(Gyama) Gangdese |
| 基金项目:国家973项目(编号: 2011CB403103);中央公益性行业科研专项(编号: 200911007-02);成矿作用与资源评价重点实验室开放基金项目 |
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| Stable Isotopes Geochemistry of the Jiama(Gyama) Copper Polymetallic Deposit in Tibet |
| The Jiama(Gyama) copper polymetallic deposit in Maizhokunggar County of Tibet is located in the eastern part of the Gangdise metallogenic belt. The metal resources of Cu, Mo, Pb+Zn, Au and Ag have all reached the scale of the large-size deposit in association with Co, Bi, W and Ni. The main ore minerals include chalcopyrite, bornite, molybdenite, galena, sphalerite, tetrahedrite and chalcocite, with anhydrite being the main sulfate mineral. Granite monzogranite and granodiorite porphyries constitute the dominant ore-bearing magmatic rocks. Sulfur isotope analyses in combination with other available data indicate that δ34S values of sulfur isotope in sulfides are ?13.6‰ ??+12.5‰, with an average of 1.33‰ for 86 samples, those in anhydrite are +0.5‰ ??+1.8‰, with an average of +1.13‰ for 3 samples, and those in porphyries are ?0.7‰ ???0.2‰ with an average of ?0.5‰ for 3 samples, which are consistent with the magmatic sulfur value (0±3‰). Sulfur isotopic geothermometer of mineral pairs such as sphalerite-galena-chalcopyrite shows the temperature of 408～433℃, indicating that sulfur isotopes in these minerals were in an equilibrium state during their formation. δ34S values of sulfides and porphy-ries from Qulong and other porphyry copper deposits in the Gangdise belt all have a small range around zero, which is consistent to the feature of magma sulfur. All these sulfur isotope characteristics indicate that the Jiama(Gyama) copper polymetallic deposit had derived the sulfur isotope composition from magma source, similar to other deposits in the Gangdise porphyry copper belt. |
| YING Li-juan,ZHENG Wen-bao,WANG Wei-ping,LENG Qiu-feng,DING Shuai.2012.Stable Isotopes Geochemistry of the Jiama(Gyama) Copper Polymetallic Deposit in Tibet[J].Acta Geoscientica Sinica,33(4):519-527. |
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