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| 拉拉铜矿含矿岩系地球化学特征及其构造意义 | |
| 引用本文： | 周家云,郑荣才,朱志敏,陈家彪,沈冰,李潇雨,罗丽萍.拉拉铜矿含矿岩系地球化学特征及其构造意义[J].矿产与地质,2009,23(2). |
| 作者姓名： | 周家云 郑荣才 朱志敏 陈家彪 沈冰 李潇雨 罗丽萍 |
| 作者单位： | 1. 中国地质科学院矿产综合利用研究所,成都,610041 2. 成都理工大学沉积"油气藏地质及开发工程"国家重点实验室,成都,610059 3. 中国地质科学院矿产综合利用研究所,成都610041;成都理工大学沉积"油气藏地质及开发工程"国家重点实验室,成都610059 |
| 基金项目： | 科技部国际科技合作项目 |
| 摘 要： | 四川会理拉拉铜矿床是我国著名大型富铜矿床,矿床的形成与古元古代河口群海相火山岩密切相关。河口群火山岩除个别样品Nb/Y较低,其他多数样品有一致高的Nb/Y比值(0.7~3.0),属碱性玄武系列;在Nb/Th-Zr/Nb和Zr/Y-Nb/Y图上,HFSE比值成分点主要投在EM1型富集地幔附近,落入洋岛玄武岩(OIB)范围;火山岩较陡的REE分布型式和"驼峰"状微量元素原始地幔标准化分配型式,以及缺乏Nb、Ta负异常,与大陆玄武岩十分吻合;岩石形成于板内裂谷环境。这些地球化学特征表明,河口群火山岩形成于陆间裂谷,来源于地幔深部,指示了矿床的火山喷流沉积成矿作用。同时,岩石大离子元素和轻稀土元素比值不太稳定,变化较大,Eu负异常与蚀变重晶石、萤石和矿化有关,还暗示了岩石遭受了后期变质作用,以及与之有关的矿床变质成矿成因。 |
| 关 键 词： | 铜矿床 含矿岩系 地球化学 构造意义 会理 四川 |
Geochemical and tectonic setting of the ore-bearing rock series occurred in the Lala copper deposit |
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| ZHOU Jia-yun,ZHENG Rong-cai,ZHU Zhi-min,CHEN Jia-biao,SHEN Bing,LI Xiao-yu,LUO Li-ping.Geochemical and tectonic setting of the ore-bearing rock series occurred in the Lala copper deposit[J].Mineral Resources and Geology,2009,23(2). | |
| Authors: | ZHOU Jia-yun ZHENG Rong-cai ZHU Zhi-min CHEN Jia-biao SHEN Bing LI Xiao-yu LUO Li-ping |
| Institution: | 1 (1.Institute of Multipurpose Utilization of Mineral Resources; Chinese Academy of Geological Sciences; Chengdu 610041; China; 2.State Key Laboratory of Oil and Gas Reservoir and Exploitation; Chengdu University of Technology; Chengdu 610059; China); |
| Abstract: | As a famous large-scale copper rich deposit in China,the Lala copper deposit in Huili of Sichuan Province is formed as a result of close influence brought by marine volcanic rocks of Palaeoproterozoic Hekou Group,which are characterized by high Nb/Y ratios(0.7~3.0) with minor rocks having relative low Nb/Y ratio,and can be concluded as alkali basalt rocks;on the diagrams of Nb/Th-Zr/Nb and Zr/Y-Nb/Y,HFSE values often fall in the neighborhood of EMI-enriched mantle within the range of OIB;the steep REE patte... |
| Keywords: | Lala copper deposit ore-bearing rock series geochemistry tectonic setting Huili Sichuan |
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