| 湖北铜绿山铜铁矿床中煌斑岩的矿物学特征及岩石成因初探 |
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| 引用本文： | 柏成,赵葵东,段登飞,SAMAKE Bakaramoko,杨水源,魏克涛.湖北铜绿山铜铁矿床中煌斑岩的矿物学特征及岩石成因初探[J].岩石学报,2015,31(3):769-783. |
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| 作者姓名： | 柏成 赵葵东 段登飞 SAMAKE Bakaramoko 杨水源 魏克涛 |
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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, 资源学院和紧缺矿产资源勘查协同创新中心, 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, 资源学院和紧缺矿产资源勘查协同创新中心, 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, 资源学院和紧缺矿产资源勘查协同创新中心, 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, 资源学院和紧缺矿产资源勘查协同创新中心, 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, 资源学院和紧缺矿产资源勘查协同创新中心, 武汉 430074;湖北省地质局第一地质大队, 大冶 435100 |
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| 基金项目： | 本文受国家科技部973项目(2012CB416706)和中国地质调查局项目([2014]04-025-034)联合资助. |
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| 摘 要： | 湖北铜绿山矽卡岩型铜铁矿床处于长江中下游铁铜成矿带西部的鄂东南矿集区。最近我们在该矿区工作中采集到两条侵入于含矿石英二长闪长玢岩中的煌斑岩脉。本文对这些煌斑岩脉进行了详细的镜下岩相学观察,并对其中造岩矿物黑云母、辉石和长石进行了电子探针成分分析。根据这些数据本文论述了煌斑岩的物源、形成环境以及岩浆体系的物理化学条件。研究表明,煌斑岩中云母为富镁黑云母,其形成的岩浆体系处于中低氧逸度(近Ni-Ni O);黑云母与全岩都具有高钛特征,表明煌斑岩的物源深度可能来自较深部地幔(如软流圈)。煌斑岩中辉石为单斜辉石,环带较为发育,有韵律环带和正环带,其韵律环带的形成可能是由于岩浆温压环境存在振荡性变化而形成的。铜绿山矿床中煌斑岩属于云煌岩;其岩浆来源具幔源性,受到地壳的混染作用不强。
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| 关 键 词： | 煌斑岩 矿物化学 富镁黑云母 高钛 单斜辉石环带 铜绿山矿床 湖北 |
| 收稿时间： | 9/1/2014 12:00:00 AM |
| 修稿时间： | 2014/11/11 0:00:00 |
Mineralogical characteristics and petrogenesis of lamprophyre dikes from the Tonglushan Fe-Cu deposit, Hubei Province |
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| BAI Cheng,ZHAO KuiDong,DUAN DengFei,SAMAKE Bakaramoko,YANG ShuiYuan and WEI KeTao.Mineralogical characteristics and petrogenesis of lamprophyre dikes from the Tonglushan Fe-Cu deposit, Hubei Province[J].Acta Petrologica Sinica,2015,31(3):769-783. |
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| Authors: | BAI Cheng ZHAO KuiDong DUAN DengFei SAMAKE Bakaramoko YANG ShuiYuan and WEI KeTao |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources and Collaborative Innovation Center for Exploration of Strategic Mineral Resources, China University of Geosciences, Wuhan 430074, China;State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources and Collaborative Innovation Center for Exploration of Strategic Mineral Resources, China University of Geosciences, Wuhan 430074, China;State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources and Collaborative Innovation Center for Exploration of Strategic Mineral Resources, China University of Geosciences, Wuhan 430074, China;State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources and Collaborative Innovation Center for Exploration of Strategic Mineral Resources, China University of Geosciences, Wuhan 430074, China;State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources and Collaborative Innovation Center for Exploration of Strategic Mineral Resources, China University of Geosciences, Wuhan 430074, China;The First Geological Brigade of Hubei Geological Bureau, Daye 435100, China |
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| Abstract: | The Tonglushan Fe-Cu deposit is a typical skarn deposit, which is located in the southeastern Hubei Province of the Middle-Lower Yangtze River Metallogenic Belt. In this paper, we carried out a detailed mineralogical study on the lamprophyres recently found in the Tonglushan deposit. According to the petrographic observations under the optical microscope and the electron microprobe analysis of the rock-forming minerals, we discuss the basic characteristics including the magma source, formation environment, physical and chemical conditions for the lamprophyre magmas. The study shows that the mica from the lamprophyre is Mg-rich biotite and its chemistry indicates a relatively low oxygen fugacity (near Ni-NiO) for the magma, and the high Ti contents in the biotite as well as the whole rock suggest that the depth of magma source must be very deep, possibly from the asthenospheric mantle. The clinopyroxene from the lamprophyre shows well-developed zone texture, including rhythmic zoning and normal zoning. The formation of the rhythmic zone is possibly due to oscillatory changes in the temperature and pressure of the magma. The mineral chemistry indicates that the lamprophyre in the Tonglushan deposit belong to minette, and the magma source is mantle-derived and without any significant crustal contamination. |
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| Keywords: | Lamprophyres Mineral chemistry Mg-rich biotite High Ti Clinopyroxene zoning Tonglushan deposit Hubei Province |
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