| 云南格咱岛弧岩浆成矿带铅同位素特征及成矿物质来源示踪 |
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| 引用本文： | 刘学龙,李文昌,尹光侯.云南格咱岛弧岩浆成矿带铅同位素特征及成矿物质来源示踪[J].现代地质,2012,26(3):445-452. |
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| 作者姓名： | 刘学龙 李文昌 尹光侯 |
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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;云南省地质调查局,云南昆明650051
2. 云南省地质调查局,云南昆明,650051 |
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| 基金项目： | 国家重点基础研究发展计划项目("973"课题)，中央高校基本科研业务费专项资金项目，中国地质调查局国土资源大调查项目 |
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| 摘 要： | 云南格咱岛弧成矿带是西南三江构造岩浆岩带的重要组成部分,是我国近年来新发现的铜多金属矿集区,产出有普朗超大型斑岩型铜矿、雪鸡坪中型斑岩型铜矿、红山大型矽卡岩-斑岩型铜矿等。测试结果表明,典型成矿斑岩体的矿石矿物铅同位素组成:206Pb/204Pb为17.680～19.165,207Pb/204Pb为15.453～15.773,208Pb/204Pb为37.730～39.654,铅同位素组成较为稳定,具有贫铀铅、富钍铅的特征。铅同位素组成与特征参数(Δβ与Δγ、V1与V2)之间具有明显的正相关性,依据铅构造模式判别和成因分类的综合分析,格咱岛弧成矿带的铅主要来源于地幔和下地壳,具壳幔混合来源的特征,其成矿作用与岩浆岩活动存在较为密切的关系。
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| 关 键 词： | 岛弧成矿带 铅同位素 成矿物质来源 格咱 云南 |
Lead Isotope Characteristics and Tracing Significance of Ore Metallogenic Material in Geza Arc Metallogenic Belt, Yunnan |
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| LIU Xue-long
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LI Wen-chang
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YIN Guang-hou.Lead Isotope Characteristics and Tracing Significance of Ore Metallogenic Material in Geza Arc Metallogenic Belt, Yunnan[J].Geoscience——Journal of Graduate School,China University of Geosciences,2012,26(3):445-452. |
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| Authors: | LIU Xue-long LI Wen-chang YIN Guang-hou |
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| Institution: | 1.School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China; 2.Yunnan Geological Survey,Kunming,Yunnan 650051,China) |
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| Abstract: | Geza arc is an important part of Yidun island arc in the southwest Sanjiang tectonic magmatic belts,located in the southern tip of the Yidun island arc,newly discovered copper polymetallic ore concentration area of China in recent years,in which Pulang super-large-sized porphyry copper deposits,Xuejiping medium-sized porphyry copper deposits,Hongshan large-sized skarn-porphyry copper deposits occur.The lead isotopic compositions of ore mineral,with 206Pb/204Pb ranging from 17.680 to 19.165,207Pb/204Pb ranging from 15.453 to 15.773,208Pb/204Pb ranging from 37.730 to 39.654,was relatively stable and charactered by depleted uranium,rich thorium.There was a significant positive correlation between lead isotopic composition and characteristic parameters(Δβ and Δγ,V1 and V2).Based on the lead structural pattern recognition and the original classification of comprehensive analysis,the lead isotope of Geza island arc metallogenic belt is mainly derived from the mantle and the lower crust,with the crust-mantle mixed source characteristics.The mineralization is closely related with magmatic activities. |
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| Keywords: | arc metallogenic belt lead isotope metallogenic material source Geza Yunnan |
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