| 云南个旧高峰山花岗岩成因:锆石U-Pb年代学及地球化学约束 |
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| 引用本文： | 李肖龙,毛景文,程彦博,张娟.云南个旧高峰山花岗岩成因:锆石U-Pb年代学及地球化学约束[J].岩石学报,2012,28(1):183-198. |
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| 作者姓名： | 李肖龙 毛景文 程彦博 张娟 |
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| 作者单位： | 1. 中国地质大学地球科学与资源学院,北京,100083
2. 中国地质大学地球科学与资源学院,北京100083;中国地质科学院矿产资源研究所,北京100037 |
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| 基金项目： | 本文受国家自然科学基金重点项目(40930419)、国土资源部公益性行业科研专项(200911007-12)、云南锡业集团有限责任公司科研项目(2010-04A)、中央高校基本科研业务费专项资金资助(2-9-2010-21)、大型矿集区时空结构与巨量金属富集机理研究(1212011120994) 联合资助. |
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| 摘 要： | 高峰山花岗岩体位于个旧矿区东区高松矿田南部,为一隐伏岩体,岩性主要为中粒黑云母二长花岗岩。本文对该岩体进行年代学、地球化学研究以约束其形成时代和岩石成因。锆石LA-ICP-MS U-Pb定年获得的形成年龄为85.76±0.58Ma,即白垩纪晚期。地球化学数据显示,高峰山花岗岩具有高硅富碱的特点,属于准铝质到过铝质的高钾钙碱性花岗岩;并富集Rb、U、Ta、Pb、Nd,而亏损Ba、Nb、Sr、P、Zr、Eu、Ti;稀土元素总量为(∑REE)为146.7×10-6~236.1×10-6,铕负异常非常明显(δEu为0.03~0.11),具有类似M型的四分组效应。初步研究表明,高峰山花岗岩具有A2型花岗岩的特征,是地壳部分熔融形成的母岩浆经高程度的分离结晶作用形成的,是晚中生代华南西部岩石圈拉张伸展的地球动力学背景下,滇东南-桂西一带大规模岩浆活动-成岩事件的产物。
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| 关 键 词： | 高峰山花岗岩 锆石U-Pb年龄 地球化学 岩石成因 云南个旧 |
| 收稿时间： | 2011/8/15 0:00:00 |
| 修稿时间： | 2011/11/20 0:00:00 |
Petrogenesis of the Gaofengshan granite in Gejiu area, Yunnan Province: Zircon U-Pb dating and geochemical constraints |
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| LI XiaoLong,MAO JingWen,CHENG YanBo and ZHANG Juan.Petrogenesis of the Gaofengshan granite in Gejiu area, Yunnan Province: Zircon U-Pb dating and geochemical constraints[J].Acta Petrologica Sinica,2012,28(1):183-198. |
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| Authors: | LI XiaoLong MAO JingWen CHENG YanBo and ZHANG Juan |
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| Institution: | School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China;School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China;School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The Gaofengshan granite is located in the eastern part of the Gejiu ore district,Yunnan Province.The lithology of the granitoid is mainly medium grained biotite monzonitic granite.In this paper,zircon U-Pb dating and geochemistry of the Gaofengshan granite is studied to constrain its geochronology and petrogenesis.Zircon LA-ICP-MS dating yields an emplacement age of 85.76±0.58Ma,which suggests that this granite formed in the Late Cretaceous.Geochemically,this granite is silica riched in composition, with high content of alkali(Na 2 O+K2 O).It’s a metaluminous to peraluminous granite and belongs to the high-K calc-alkaline series, and characterized by enrichment of Rb,U,Ta,Pb,Nd and depletion of Ba,Nb,Sr,P,Zr,Eu,Ti.The abundance of∑REE varies in the range of 146.7×10 -6 to 236.1×10 -6 ,and it has intensely negative Eu abnormality(δEu=0.03～0.11).What’s more,it reflects a tetrad-like effect with a shape of"M".These features are coincident with A2 granite.Geochemical characteristics show that the parental magma of the Gaofengshan granite was derived from the partial melting of crust,and experienced a strong crystal fractionation process.New data of this study indicate that the Gaofengshan granite was one component of the large scale Late Cretaceous magmatism in western Cathaysia block,which viewed as under a regional lithospheric extension tectonic setting. |
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| Keywords: | Gaofengshan granite Zircon U-Pb age Geochemistry Petrogenesis Gejiu area Yunnan Province |
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