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| 陕西省略阳县杨家坝多金属矿区成矿作用地球化学示踪 | |
| 引用本文： | 赵甫峰,刘显凡,朱赖民,楚亚婷,李春辉,蔡永文,蔡飞跃.陕西省略阳县杨家坝多金属矿区成矿作用地球化学示踪[J].岩石学报,2010,26(5):1465-1478. |
| 作者姓名： | 赵甫峰 刘显凡 朱赖民 楚亚婷 李春辉 蔡永文 蔡飞跃 |
| 作者单位： | 1. 成都理工大学地球科学学院,成都,610059 2. 成都理工大学地球科学学院,成都,610059;南京大学内生金属矿床成矿机制研究国家重点实验室,南京,210093 3. 西北大学地质学系,西安,710069 |
| 基金项目： | 国家重点基础研究发展规划项目(2006CB403502)、国家自然科学基金项目(40773031)、南京大学内生金属矿床成矿机制研究国家重点实验室开放研究基金项目(14-08-3)和成都理工大学矿物学岩石学矿床学国家重点(培育)学科建设项目(SZD0407)联合资助 |
| 摘 要： | 本文以陕西省略阳县杨家坝多金属矿区为例,通过对该矿区岩(矿)石和各类脉体的岩相学、稀土和微量元素及流体包裹体地球化学示踪发现,多金属中重晶石的形成及硅化、碳酸盐化、滑石化、纤闪石化、绢云母化和绿泥石化和透闪石岩的含氟浅闪石及隐晶硅质玻璃和微晶硅质,这表明与成矿蚀变有关的热液流体是一种不同于一般地壳流体的富硅、钛、铁、碱质和挥发份,并具备熔体性质的成矿流体。各类样品的稀土元素配分模式明显富集LREE,在Ce、Eu、Yb异常的组合上也各具特征。LREE富集是地幔流体作用的显著特征之一;矿石和脉体的负Ce、正Eu和负Yb异常以及流体包裹体中H2O-C6H6成分,是高温还原地幔流体的重要标志;正Ce和负Eu异常的出现,以及Ce、Eu、Yb异常的减弱和消失则是壳幔混染叠加改造的显示。综合研究表明:矿区成矿过程可能统一受制于秦岭地区碰撞造山背景下具高温还原性质的地幔流体作用,且由此引发壳幔强烈混染的叠加改造作用在成矿过程中发挥了重要作用。 |
| 关 键 词： | 岩相学特征 微量元素特征 壳幔混染叠加改造 成矿作用地球化学 陕西略阳杨家坝 |
| 收稿时间： | 2009/12/27 0:00:00 |
| 修稿时间： | 3/1/2010 12:00:00 AM |
Geochemistry trace of metallization for polymetal field in Yangjiaba, Lueyang, Shaanxi Province |
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| Zhao FF,Liu XF,Zhu LM,Chu YT,Li CH,Cai YW and Cai FY.Geochemistry trace of metallization for polymetal field in Yangjiaba, Lueyang, Shaanxi Province[J].Acta Petrologica Sinica,2010,26(5):1465-1478. | |
| Authors: | Zhao FF Liu XF Zhu LM Chu YT Li CH Cai YW and Cai FY |
| Institution: | Institute of Earth Science, Chengdu University of Technology, Chengdu 610059, China;Institute of Earth Science, Chengdu University of Technology, Chengdu 610059, China;Department of Geology, Northwest University, Xi'an 710069, China;Institute of Earth Science, Chengdu University of Technology, Chengdu 610059, China;Institute of Earth Science, Chengdu University of Technology, Chengdu 610059, China;Institute of Earth Science, Chengdu University of Technology, Chengdu 610059, China;Institute of Earth Science, Chengdu University of Technology, Chengdu 610059, China |
| Abstract: | As the example of Yangjiaba polymetallic ore field in Lueyang area, Shaanxi Province, generation of baritite and later silication, carbonatization, talcization, uralitization, sericitization and chloritization and so forth are discovered by analyzing and studying of petrography. With fluorinated achromaite, crypto-crystal siliceous glass and aphanitic kiesel in tremolite, it indicates that hydrothermal fluid which is related to alteration of mineralization is mineralizing fluid, being rich in Si, Fe, Ti and alkali, volatile flux and characteristic of melt mass, which is different from general hydrothermal fluid of crust. The characteristics, as rich in LREE and different assembled abnormity of Ce and Eu and Yb, are found in ore and quartz-calcite veins and volcanic host from polymetal deposits by analyzing and studying their geochemistry of REE, trace element and fluid inclusions. It is concluded that the rich in LREE is one of the obvious characteristics for the action of mantle fluid. Anomalies of positive Eu and negative Ce and Yb in ore and veins and the H2O-C6H6 fluid from fluid inclusion in vein are the important symbols that the mantle fluid has the nature of high temperature and reduction. Existence of anomalies of positive Ce and negative Eu and Ce, Eu, Yb anomalies' weakening and disappearance are an expression as mixing and alteration of crust-mantle fluid. Comprehensive research indicates that poly-metallization is controlled by the mantle fluid being of the natures of high temperature and reduction and rich in LREE under the background of Qinling orogene.Overlying, which causes that the overlying alteration of strong mixing of crust-mantle fluid plays an important role in the poly-metallization. |
| Keywords: | Petrography Trace elements Overlying alteration of crust-mantle fluid mixing Mineralizing geochemistry Yangjiaba of Lueyang in Shaanxi Province |
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