| 安徽沙溪斑岩型铜金矿床成岩序列及成岩成矿年代学研究 |
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| 引用本文： | 王世伟,周涛发,袁峰,范裕,俞沧海,葛岭虹,石诚,池月余.安徽沙溪斑岩型铜金矿床成岩序列及成岩成矿年代学研究[J].岩石学报,2014,30(4):979-994. |
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| 作者姓名： | 王世伟 周涛发 袁峰 范裕 俞沧海 葛岭虹 石诚 池月余 |
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| 作者单位： | 合肥工业大学资源与环境工程学院, 合肥 230009;合肥工业大学资源与环境工程学院, 合肥 230009;合肥工业大学资源与环境工程学院, 合肥 230009;合肥工业大学资源与环境工程学院, 合肥 230009;铜陵有色金属集团控股有限公司, 铜陵 244000;合肥工业大学资源与环境工程学院, 合肥 230009;铜陵有色金属集团控股有限公司, 铜陵 244000;安徽省地质矿产勘查局327地质队, 合肥 230001 |
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| 基金项目： | 本文受国家“深部探测技术与实验研究专项”项目课题（SinoProbe-03-04）、国家自然科学基金项目（41320104003、41172086、40830426）、中国地质调查局地质调查工作项目（1212011121115、1212011220243）、安徽省公益性地质工作项目（2011-20）和教育部博士点基金项目和新世纪优秀人才支持计划项目（20100111110010、NCET-10-0324）联合资助. |
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| 摘 要： | 沙溪矿床是长江中下游成矿带中典型的斑岩型铜金矿床,位于庐枞盆地北外缘、郯庐断裂内,矿床成岩成矿时代确定对该矿床成因研究及区域成矿规律的认识具有重要意义。在详细野外地质工作的基础上,采集沙溪矿床与成矿有关的主要岩浆岩样品(粗斑闪长玢岩、黑云母石英闪长玢岩、中斑石英闪长玢岩、细斑石英闪长玢岩和闪长玢岩)和与黄铜矿密切共生的辉钼矿,分别利用Cameca、LA-ICP-MS U-Pb和Re-Os同位素定年方法,获得矿床内主要岩浆岩的成岩年龄(130.60±0.97Ma、129.30±1.00Ma、127.10±1.50Ma、129.46±0.97Ma和126.7±2.1Ma)以及成矿年龄(130.0±1.0Ma),并重新厘定了沙溪岩体从早到晚岩浆的侵位序列。通过区域对比,提出长江中下游存在两阶段斑岩型铜金矿化,沙溪矿床为长江中下游成矿带第二阶段形成的斑岩型矿床,沙溪矿床的成岩成矿作用既不同于庐枞盆地,也不同于断隆区第一阶段的斑岩矿床,而是受郯庐断裂和长江断裂动力学演化联合作用的产物。
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| 关 键 词： | 成岩成矿年代 沙溪矿床 斑岩型铜金矿床 两阶段斑岩矿化 |
| 收稿时间： | 2013/10/1 0:00:00 |
| 修稿时间： | 2014/1/15 0:00:00 |
Emplacement sequences and geochronology of the Shaxi porphyry copper-gold deposit, Anhui Province, East China |
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| WANG ShiWei,ZHOU TaoF,YUAN Feng,FAN Yu,YU CangHai,GE LingHong,SHI Cheng and CHI YueYu.Emplacement sequences and geochronology of the Shaxi porphyry copper-gold deposit, Anhui Province, East China[J].Acta Petrologica Sinica,2014,30(4):979-994. |
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| Authors: | WANG ShiWei ZHOU TaoF YUAN Feng FAN Yu YU CangHai GE LingHong SHI Cheng and CHI YueYu |
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| Institution: | School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Tongling Nonferrous Metals Group Holding co., Ltd., Tongling 244000, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Tongling Nonferrous Metals Group Holding co., Ltd., Tongling 244000, China;No.327 Geological Team, Bureau of Geology and Mineral Resources of Anhui Province, Hefei 230001, China |
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| Abstract: | Shaxi deposit is a typical porphyry Cu-Au deposit, which locates in the Tancheng-Lujiang fault and the northwest margin of the Luzong volcanic basin in the Middle and Lower Yangtze River metallogenic belt. The Shaxi porphyry deposit contains >1Mt Cu and 40t Au, which is dominated by vein-style mineralisation with chalcopyrite and gold hosted in a quartz stockwork vein that is intimately associated with potassic alteration in the core of the deposit. To determine the age of mineralization and the magmatic rocks of Shaxi deposit is very important for the study of deposit genesis and regional metallogenic regularities. On the basis of geological and petrographic studies, we collect the primary types of magmatic rocks (coarse grained diorite porphyry, biotite quartz diorite porphyry, medium quartz diorite porphyry, fine quartz diorite porphyry and diorite porphyry) and molybdenite with paragenetic chalcopyrite and get the age of the magmatic rocks (they are 130.60±0.97Ma, 129.30±1.00Ma, 127.10±1.50Ma, 129.46±0.97Ma and 126.7±2.1Ma, respectively) by zircon Cameca, LA-ICP-MS U-Pb dating and mineralization (130.0±1.0Ma) by Re-Os dating of Shaxi deposit, and reclassify the emplacement sequences of magmatic rock. Our work also indicates that Shaix deposit is the second stage porphyry mineralization, which is different from the deposit and magmatic rocks of Luzong basin and the first stage porphyry deposits, imply that Shaxi deposit is the product of the geotectonical evolution of bith the Tancheng-Lujiang fault and the Changjiang fault. |
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| Keywords: | Geochronology Shaxi deposit Porphyry Cu-Au deposit Two stages porphyry mineralization |
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