| 浙江安吉铅锌多金属矿区细粒花岗岩的岩石化学、年代学及成矿意义探讨 |
| Received:December 17, 2010 Revised:June 22, 2012 点此下载全文 |
| 引用本文：XIE YuLing,TANG YanWen,LI YingXu,QIU LiMing,LIU BaoShun,LI Yuan,ZHANG XinXin,HAN YuDa,JIANG YanCen.2012.Petrochemistry, chronology and ore-forming geological significance of fine crystalline granite in Anji polymetallic deposit of Zhejiang Province[J].Mineral Deposits,31(4):891~902 |
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| Author Name | Affiliation | | XIE YuLing | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China | | TANG YanWen | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China | | LI YingXu | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China | | QIU LiMing | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China | | LIU BaoShun | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China | | LI Yuan | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China | | ZHANG XinXin | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China | | HAN YuDa | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China | | JIANG YanCen | School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目:本文是国土资源部公益性行业基金项目(编号:201011011)和十二五国家科技计划项目(编号: 2011BAB04B00)联合资助的成果 |
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| 中文摘要:文章在详细的野外地质调查、岩石学、岩石化学和锆石U-Pb定年结果基础上,对浙江安吉矿区细粒花岗岩的岩浆起源、侵位时代与成矿的关系及找矿指示意义等进行了较为深入的探讨。细粒花岗岩侵位时代晚于矿区的黑云母二长花岗岩、正长花岗岩和花岗闪长岩,侵位时代约在134 Ma左右,为中国东部晚侏罗世—早白垩世岩石圈活化及大规模成岩成矿作用的产物。岩石化学研究结果表明,细粒花岗岩属高钾钙碱性-钾玄岩、过铝质岩石系列,轻稀土元素相对富集,重稀土元素相对亏损,富集大离子亲石元素Rb、Th、U、K、轻稀土元素和Pb,明显亏损高场强元素Nb、Ta、Ti和P,显示较高的分异程度。据根锆饱和温度,计算其母岩浆结晶温度约在834.6~870.6℃。结合矿区已知的矿化和蚀变与细粒花岗岩的空间关系、细粒花岗岩岩石化学特征以及细粒花岗岩与矿石铅同位素研究结果,笔者认为,安吉铅锌多金属矿区铅锌钼矿化与细粒花岗岩具有密切的成因联系,细粒花岗岩与寒武系灰岩接触部位控制了矽卡岩型铅锌矿化的产出,这一成果对该区的进一步找矿勘查具有重要的指导意义。 |
| 中文关键词:地球化学 Pb-Zn多金属矿 细粒花岗岩 锆石U-Pb定年 成矿意义 浙江安吉 |
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| Petrochemistry, chronology and ore-forming geological significance of fine crystalline granite in Anji polymetallic deposit of Zhejiang Province |
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| Abstract:Based on ore deposit geology, petrogeochemistry and chronology of fine crystalline granite, this paper discusses the magma sources, intrusive age of fine crystalline granite and their genetic link with Pb-Zn mineralization in this area. The results indicate that the fine crystalline granite intruded into biotite monzonitic granite at about 134 Ma, which was consistant with lithosphere activation and large-scale diagenesis-metallogenesis event in East China. Petrochemical studies show that the fine crystalline granites belong to high-K calc-alkalic to shoshonitic series with peraluminous characteristics. Main and trace element compositions show a transitional character from type I to type S granite. The estimated magma temperatures are about 834.6~870.6℃ according to Zr saturation thermometer. The distribution of known mineralization in the ore district, the petrochemistry of fine crystalline granite and Pb isotopic analyses indicate that the Pb-Zn (Mo) mineralization has genetic link with this granite intrusion. The contact zone between fine crystalline granite and Cambrian limestone controls the skarn-type Pb-Zn mineralization. The results have important implications for exploration in this area. |
| keywords:geochenmistry Pb-Zn polymetallic deposit fine crystalline granite zircon U-Pb dating geological significance Anji of Zhejiang Province |
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