| 还原性斑岩型Cu与Mo-Cu矿特征与形成机制 |
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| 引用本文： | 吴楚,刘妍,曹明坚,洪涛,徐兴旺,董连慧.还原性斑岩型Cu与Mo-Cu矿特征与形成机制[J].岩石学报,2015,31(2):617-638. |
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| 作者姓名： | 吴楚 刘妍 曹明坚 洪涛 徐兴旺 董连慧 |
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| 作者单位： | 中国地质大学地球科学与资源学院, 北京 100083;中国科学院矿产资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029;中国地质大学地球科学与资源学院, 北京 100083;中国科学院矿产资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029;中国科学院矿产资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029;中国科学院大学, 北京 100049;中国科学院矿产资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029;中国地质大学地球科学与资源学院, 北京 100083;中国科学院矿产资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029;新疆维吾尔自治区地质矿产勘查局, 乌鲁木齐 830000 |
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| 基金项目： | 本文受新疆维吾尔自治区地质矿产勘查局自筹资金项目(XGMB2013007)、中国科学院知识创新工程主要方向项目(KZCX-EW-LY03)和国家自然科学基金项目(41072060)联合资助. |
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| 摘 要： | 还原性斑岩型Cu矿是近年新识别的一类斑岩型矿床,以岩浆阶段发育大量磁黄铁矿和成矿流体富CH4为主要特征。成因上,还原性斑岩型Cu矿与钛铁矿系列I型花岗岩伴生,形成于俯冲环境或者后碰撞环境。成矿流体为岩浆流体。岩浆阶段磁黄铁矿的结晶沉淀将导致岩浆中成矿元素Cu进入硫化物相而贫化,不利于成矿元素在流体中富集,结果导致还原性斑岩型Cu矿的矿化和蚀变规模较小。对比研究发现西准噶尔宏远Mo-Cu矿也具有还原性斑岩型矿床的特征,可能为还原性斑岩型矿床的新类型。
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| 关 键 词： | 还原性斑岩型Cu矿 富CH4成矿流体 形成机制 还原性斑岩型Mo-Cu矿 |
| 收稿时间： | 2014/5/19 0:00:00 |
| 修稿时间： | 2014/12/15 0:00:00 |
Characteristics and formation mechanism of reduced porphyry Cu and Mo-Cu deposits |
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| WU Chu,LIU Yan,CAO MingJian,HONG Tao,XU XingWang and DONG LianHui.Characteristics and formation mechanism of reduced porphyry Cu and Mo-Cu deposits[J].Acta Petrologica Sinica,2015,31(2):617-638. |
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| Authors: | WU Chu LIU Yan CAO MingJian HONG Tao XU XingWang and DONG LianHui |
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| Institution: | School of Geosciences and Resources, China University of Geosciences, Beijing 100083, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;School of Geosciences and Resources, China University of Geosciences, Beijing 100083, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;School of Geosciences and Resources, China University of Geosciences, Beijing 100083, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Xinjiang Bureau of Geology and Mineral Resources, Uramuqi 830000, China |
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| Abstract: | Reduced porphyry Cu deposits, that are recently recognized as a new type of porphyry Cu deposit, are characterized by widely occurrence of primary pyrrhotite at magmatic stages and CH4-bearing ore-forming fluids. Reduced porphyry Cu deposits are genetically related to ilmenite series, I-type granitoids, and suggested to be formed at subduction or post-subduction tectonic settings. The ore-forming fluids are magmatic. Crystallization and precipitation of magmatic pyrrhotite will cause the strong partition of copper content into the sulfide phase, resulting in decreasing of copper content in the melts. This process is not favour for enrichment of copper-rich fluids and formation of large class reduced porphyry Cu deposits. On the basis of definition of reduced porphyry Cu deposit, it is suggested that the Hongyuan Mo-Cu deposits in West Junggar is probably a new subtype of reduced porphyry deposit. |
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| Keywords: | Reduced porphyry Cu deposit CH4-bearing ore-forming fluid Formation mechanism Reduced porphyry Mo-Cu deposit |
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