| 安徽安庆铜铁矿床成因:矿床地质特征与元素地球化学约束 |
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| 引用本文： | 张智宇,杜杨松,向文帅,滕传耀,龙旺生,董玉翠,李湘莲.安徽安庆铜铁矿床成因:矿床地质特征与元素地球化学约束[J].岩石学报,2012,28(11):3739-3756. |
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| 作者姓名： | 张智宇 杜杨松 向文帅 滕传耀 龙旺生 董玉翠 李湘莲 |
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| 作者单位： | 地质过程与矿产资源国家重点实验室, 中国地质大学地球科学与资源学院, 北京 100083;地质过程与矿产资源国家重点实验室, 中国地质大学地球科学与资源学院, 北京 100083;中国地质调查局武汉地质调查中心, 武汉 430205;地质过程与矿产资源国家重点实验室, 中国地质大学地球科学与资源学院, 北京 100083;铜陵有色金属集团股份有限公司安庆铜矿, 铜陵 246003;地质过程与矿产资源国家重点实验室, 中国地质大学地球科学与资源学院, 北京 100083;地质过程与矿产资源国家重点实验室, 中国地质大学地球科学与资源学院, 北京 100083 |
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| 基金项目： | 本文受国家自然科学基金项目(40672045);中国地质调查局项目(20089938)和地质过程与矿产资源国家重点实验室开放课题基金项目(GPMR201101)联合资助. |
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| 摘 要： | 安庆铜铁矿床是产于长江中下游铜(金)、铁成矿带内安庆-贵池矿集区中的一典型矽卡岩矿床,矿体赋存于下三叠统南陵湖组大理岩与月山闪长岩体之间的接触带上。典型剖面系统取样分析显示,矿体与围岩在空间上具有显著的矿物组合分带与岩石化学分带特征,即靠近大理岩带发育致密块状磁铁矿矿石与团块状矽卡岩型矿石,远离大理岩带发育浸染状矽卡岩型矿石,靠近闪长岩带发育透辉石矽卡岩。从大理岩到磁铁矿体, Fe2O3T含量显著增加,之后随着靠近闪长岩体,其含量呈逐渐降低趋势;而CaO显示了与Fe2O3T相反的成分变异特征。矿物与全岩微量元素研究表明,致密块状磁铁矿矿石及团块状矽卡岩型矿石均具有岩浆成因的稀土元素配分模式;而浸染状矽卡岩型矿石显示了交代成因的稀土元素配分特征。矿体地质、矿相学与元素地球化学综合研究表明,矽卡岩成矿经历了矿浆贯入期与热液成矿期,前者包括氧化物阶段和硫化物-碳酸盐阶段,后者包括进化交代阶段、早退化蚀变阶段、石英-硫化物阶段和晚退化蚀变阶段。结合已有的区域岩浆岩成岩机制研究成果,认为安庆铜铁矿床应是矿浆贯入与接触交代复合成因的矽卡岩型矿床,由于高位岩浆房中岩浆不混溶作用形成的富Fe熔浆是该矿床中成矿元素的主要来源。
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| 关 键 词： | 矿床地质 元素地球化学 矽卡岩 矿浆贯入 热液交代 安庆铜铁矿 |
| 收稿时间： | 5/8/2012 12:00:00 AM |
| 修稿时间： | 2012/8/16 0:00:00 |
Genesis of Anqing copper-iron deposit, Anhui Province: Constraints from mineral deposit geology and element geochemistry |
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| ZHANG ZhiYu,DU YangSong,XIANG WenShuai,TENG ChuanYao,LONG WangSheng,DONG YuCui and LI XiangLian.Genesis of Anqing copper-iron deposit, Anhui Province: Constraints from mineral deposit geology and element geochemistry[J].Acta Petrologica Sinica,2012,28(11):3739-3756. |
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| Authors: | ZHANG ZhiYu DU YangSong XIANG WenShuai TENG ChuanYao LONG WangSheng DONG YuCui and LI XiangLian |
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| Institution: | State Key Laboratory of Geological Process and Mineral Resources, School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Process and Mineral Resources, School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China;State Key Laboratory of Geological Process and Mineral Resources, School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Anqing Copper Mine of Tongling Nonferrous Metals Group Co., Ltd., Tongling 246003, China;State Key Laboratory of Geological Process and Mineral Resources, School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Process and Mineral Resources, School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The Anqing copper-iron deposit is a typical skarn-type deposit, which is located in the Anqing-Guichi ore cluster along the Middle and Lower Yangtze River Cu (Au)-Fe metallogenic belt. Ore bodies occur in the contact zone between marble layer belonging to the Nanlinghu Formation of Lower Triassic and Yueshan dioritic intrusion. Analyses of the typical skarn samples systematically collected from a cross section show that the ore bodies and surrounding rocks have a significant petrochemical zoning with variation of mineral assemblage in space. Namely, bodies of magnetite ore with dense block structure and skarn-type ore with crumb structure occur close to the marble zone, while that of skarn-type ore with disseminated structure exists far away from the marble zone. Diopside-riched skarn develops near the diorite. The content of Fe2O3T increases significantly from the marble zone to the magnetite ore body, and decreases gradually close to the diorite. However, there appears a varying trend of CaO contrary to that of Fe2O3T. REE patterns of minerals and whole-rocks show a magmatic origin of dense massive magnetite ore and crumb skarn-type ore, but a metasomatic origin of disseminated skarn-type ore. Comprehensive studies of orebody geology, mineragraphy and element geochemistry support division of the process of mineralization into two periods of ore pulp penetration and hydrothermal fluids metasomatism. The former includes oxide stage and sulfide-carbonate stage, while the latter consists of prograde stage, early retrograde stage, quartz-sulfide stage and late retrograde stage. The mentioned data combined with the research result of regional magmatic process indicate a complex origin of the Anqing copper-iron deposit by ore pulp penetration with contact metasomatism. Fe-riched ore pulp formed by immiscibility in shallow magma chamber should be the main source of ore-forming elements in the deposit. |
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| Keywords: | Mineral deposit geology Element geochemistry Skarn Penetration of ore pulp Hydrothermal replacement Anqing copper-iron deposit |
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