| 江西九瑞矿集区南港成矿远景区煌斑岩中辉石矿物成分特征与岩浆演化过程 |
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| 引用本文： | 杨照耀,徐耀明,朱志勇,周巍,柏成.江西九瑞矿集区南港成矿远景区煌斑岩中辉石矿物成分特征与岩浆演化过程[J].岩石学报,2015,31(3):675-685. |
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| 作者姓名： | 杨照耀 徐耀明 朱志勇 周巍 柏成 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室, 资源学院和紧缺战略矿产资源协同创新中心, 武汉 430074;中国地质大学地质过程与矿产资源国家重点实验室, 资源学院和紧缺战略矿产资源协同创新中心, 武汉 430074;南京大学内生金属矿床成矿机制研究国家重点实验室, 地球科学与工程学院, 南京 210093;南京大学内生金属矿床成矿机制研究国家重点实验室, 地球科学与工程学院, 南京 210093;中国地质大学地质过程与矿产资源国家重点实验室, 资源学院和紧缺战略矿产资源协同创新中心, 武汉 430074 |
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| 基金项目： | 本文受科技部973项目(2012CB416706)和"十二五"国家科技支撑计划(2011BAB04B03)联合资助. |
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| 摘 要： | 九瑞矿集区隶属于长江中下游铜-铁-金成矿带,该矿集区内主要发育有武山、城门山、洋鸡山、丁家山等大中型铜金多金属矿床。区内的南港成矿远景预测区位于横立山-黄桥向斜的南翼,地质条件与该向斜北翼的武山铜矿基本一致。本文以南港地区发现的煌斑岩为研究对象,对其中的辉石进行了详细的岩相学和电子探针成分分析工作,来探讨煌斑岩的演化过程及岩石成因。测试结果显示,南港煌斑岩中的辉石,具有高Ca、高Mg,低Ti,贫Al、贫Fe的特点。斑晶中的辉石属于透辉石和普通辉石,基质中的辉石则属于普通辉石。辉石斑晶的viAl和Na2O含量很低,指示其形成压力较小。由早到晚从斑晶到基质,辉石向着富铁富钙的方向演化。辉石发育有反环带及韵律环带,显示在岩浆房中可能受到过岩浆混合作用的影响。辉石的矿物化学特征指示南港煌斑岩属碱性岩石系列。
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| 关 键 词： | 矿物化学 煌斑岩 辉石 成分环带 九瑞地区 |
| 收稿时间： | 2014/8/24 0:00:00 |
| 修稿时间： | 2014/10/30 0:00:00 |
Mineral chemistry of pyroxene in lamprophyre from the Nangang prospecting area in the Jiurui ore district of Jiangxi Province: Implication for magma evolution |
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| YANG ZhaoYao,XU YaoMing,ZHU ZhiYong,ZHOU Wei and BAI Cheng.Mineral chemistry of pyroxene in lamprophyre from the Nangang prospecting area in the Jiurui ore district of Jiangxi Province: Implication for magma evolution[J].Acta Petrologica Sinica,2015,31(3):675-685. |
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| Authors: | YANG ZhaoYao XU YaoMing ZHU ZhiYong ZHOU Wei and BAI Cheng |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, Collaborative Innovation Center for Exploration of Strategic Mineral Resources, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;State Key Laboratory of Geological Processes and Mineral Resources, Collaborative Innovation Center for Exploration of Strategic Mineral Resources, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;State Key Laboratory of Geological Processes and Mineral Resources, Collaborative Innovation Center for Exploration of Strategic Mineral Resources, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | The Jiurui ore district belongs to the Middle-Lower Yangtze River Mineralization Belt. In this area, there are many large and medium-scale copper deposits such as Wushan, Chengmenshan, Yangjishan and Dingjiashan. The Nangang copper prospecting area is located in the south of the Wushan ore deposit, and its geological conditions are similar to Wushan. This study focuses on the lamprophyres sampled from boreholes in the Nangang area. We carried out a detailed mineral chemistry study of pyroxene and discussed the magma evolution and petrogenesis of the lamprophyre. The results showed that the pyroxenes from the lamprophyre have a composition of high Ca and Mg, low Ti, poor Al and Fe. The pyroxenes belong to the augite and diopside, and they crystallized in lower pressure. From phenocryst to matrix, chemical compositional evolution of the pyroxenes is in the direction of Fe-rich and Ca-rich. The occurrence of reverse zoning and rhythm zoning of pyroxenes indicates a magma mixing process in the magma chamber. The features of mineral chemistry show that the host lamprophyres belong to alkaline series. |
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| Keywords: | Mineral chemistry Lamprophyre Pyroxene Zonation Jiurui district |
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