| 西藏甲玛铜多金属矿二长花岗斑岩岩浆-热液过渡特征及成矿意义 |
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| 关键词:monzonite granite-porphyry magmatic hydrothermal transition metallogenesis Jiama(Gyama) Cu polymetallic deposit Gangdise ore belt Tibet |
| 基金项目:国家973项目(编号: 2011CB403103);国土资源地质大调查项目(编号: 1212010012005);中央公益性行业科研专项(编号: 200911007-02) |
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| Characteristics and Significance of Magmatic-Hydrothermal Transition in Jiama(Gyama) Monzonite Granite-porphyry, Tibet |
| Based on basic geological data, this paper summed up the characteristics and metallogenesis of the magmatic-hydrothermal transition in the Jiama(Gyama) monzonite granite-porphyry with the help of the electron microprobe analytical data and rock geochemical data in the aspects of petrology, petrography and geochemistry. The characteristics of the magmatic-hydrothermal transition in the Jiama(Gyama) monzonite granite-porphyry is manifested as tourmalinization-sodium/calcium silicate, like pegmatite-aplite shell (pulse), “adularia-habit” K-feldspar crystals, myrmekite, miarolitic cavities, while the geochemical characteristics are expressed as the growth and decrease of Na/K and the fluctuatation of the volatiles with the separation of the ore-forming materials such as Cu, Mo, Au. The development of the magmatic-hydrothermal transition can be divided into liquid immiscibility and volatile-liquid fractionation, the former dominated the mineral fractionation in the later magma, while the latter controlled the formation of ore solution and ore-forming hydrothermal fluids, forming disseminated mineralization and stockwork mineralization respectively. |
| QIN Zhi-peng,Dorji,WANG Xiong-wu,LIU Hong-fei,ZHOU Yun,PENG Hui-juan.2012.Characteristics and Significance of Magmatic-Hydrothermal Transition in Jiama(Gyama) Monzonite Granite-porphyry, Tibet[J].Acta Geoscientica Sinica,33(4):501-509. |
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