| 安徽西冲钼矿床细粒花岗岩的岩石定年、岩石化学及与成矿的关系研究 |
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| 引用本文： | 谢玉玲,李腊梅,郭翔,MEFFRESebastien,CHANGZhaoShan,张健,姚羽,王爱国.安徽西冲钼矿床细粒花岗岩的岩石定年、岩石化学及与成矿的关系研究[J].岩石学报,2015,31(7):1929-1942. |
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| 作者姓名： | 谢玉玲 李腊梅 郭翔 MEFFRESebastien CHANGZhaoShan 张健 姚羽 王爱国 |
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| 作者单位： | 北京科技大学土木与环境工程学院, 北京 100083,北京科技大学土木与环境工程学院, 北京 100083,北京科技大学土木与环境工程学院, 北京 100083,CODES ARC Centre of Excellence in Ore Deposits, University of Tasmania, TAS7001, Australia,Economic Geology Research Center (EGRU), James Cook University, Townsville, QLD 4811, Australia,北京科技大学土木与环境工程学院, 北京 100083,北京科技大学土木与环境工程学院, 北京 100083,中国地质科学院南京地质矿产研究所, 南京 210016 |
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| 基金项目： | 本文受国土资源部公益性行业基金项目(201011011)和中国地质调查局项目(2014-01-020-010)联合资助. |
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| 摘 要： | 西冲钼矿是大别成矿带东段近年新发现的斑岩型钼-多金属矿床,其矿床学和矿床地球化学研究少见报导。该研究成果丰富了我国斑岩-矽卡岩型钼钨-多金属矿床研究成果,同时对指导区域找矿具有一定意义。本文在详细的野外地质调研基础上,对大别成矿带西冲钼矿区出露的主要岩石单元、矿化和蚀变特征、细粒花岗岩的岩石学、岩石化学和成岩年代学进行了系统的研究。结果表明,矿区出露的主要侵入岩单元由老至新依次为:石英二长岩、细粒花岗岩(130.8±1.1Ma)及双峰式脉岩组合(131.9±1.4Ma和131.3±1.6Ma),其均为燕山期岩浆活动产物,产于华北与扬子陆块拼合后的陆内环境。矿化类型以脉状、网脉状和浸染状为主,为一斑岩型钼-多金属矿床。矿区蚀变发育,包括黑云母-磁铁矿化、钾长石化、硅化、石英-绢云母化、石英-绿帘石化、绿泥石-碳酸盐化和泥化,且空间上具有一定的分带规律。矿区已知矿化、蚀变及Cu-Mo化探异常的空间展布与细粒花岗岩关系密切,且细粒花岗岩中具有高的Mo含量,表明该矿床的形成主要与细粒花岗岩有关。岩石化学结果表明,细粒花岗岩属过铝质-准铝质、高钾钙碱性-钾玄质过渡岩石,锆石U-Pb年龄与双峰式脉岩的在误差范围内一致,表明其均形成于大别造山带大规模伸展背景。
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| 关 键 词： | 西冲钼矿 细粒花岗岩 岩石定年 岩石化学 成矿地质背景 大别成矿带 |
| 收稿时间： | 2014/7/10 0:00:00 |
| 修稿时间： | 2015/3/16 0:00:00 |
Chronology, petrochemistry of fine grained granite and their implication to Mo-Cu mineralization in Xichong Mo deposit, Anhui Province, China. |
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| XIE YuLing,LI LaMei,GUO Xiang,MEFFRE Sebastien,CHANG ZhaoShan,ZHANG Jian,YAO Yu and WANG AiGuo.Chronology, petrochemistry of fine grained granite and their implication to Mo-Cu mineralization in Xichong Mo deposit, Anhui Province, China.[J].Acta Petrologica Sinica,2015,31(7):1929-1942. |
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| Authors: | XIE YuLing LI LaMei GUO Xiang MEFFRE Sebastien CHANG ZhaoShan ZHANG Jian YAO Yu and WANG AiGuo |
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| Institution: | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China,School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China,School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China,CODES ARC Centre of Excellence in Ore Deposits, University of Tasmania, Hobart TAS 7001, Australia,Economic Geology Research Center (EGRU), James Cook University, Townsville, QLD 4811, Australia,School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China,School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China and Nanjing Institute of Geology and Mineral Resource, Chinese Academy of Geological Sciences, Nanjing 210016, China |
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| Abstract: | The Xichong molybdenum deposit is located in Yuexi County of Anhui Province, China, which is in the east end of Qinling-Dabie metallogenic belt. The intrusive rock in Xichong Mo deposit, from early to late, are quartz monzonite, fine grained granite(130.8±1.1Ma) and bimodel dikes (including quartz syenite porphyry and lamprophyre) which are all Yanshanian magmatic products occurring in inner continental environment. The ore styles include vein style, stockwork and disseminated style, showing porphyry type mineralization characteristics. The well developed alterations include biotite-magmatite alteration, K-feldspar alteration, quartz-muscovite (sericite) alteration, silification, quartz-epidote alteration, chlorite-carbonate alteration and argillic alteration. The Cu-Mo mineralization is closely related to quartz-sercite and quartz-epidote alteration, and minor Cu mineralization is related to argillic alteration. The distribution of Cu-Mo mineralization and Cu-Mo geochemical abnormity is spatially related to fine grained granite which has high Mo content, and shows NW trend. The whole rock geochemical results of fine grained granite show peraluminous-metaluminous, high K calc-alkalic granite characteristics with a mixed mantle-crust origin. The fine grained granite has a similar intrusive age with bimodel dikes and implies a regional extention environment. |
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| Keywords: | Xichong Mo deposit Fine grained granite Geochronology Petrochemistry Geological setting Dabie metallogenic belt |
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