| Geochemical Studies of Sodium Enriched Metavolcanite Series in the Area of Longbohe Copper Deposit,Yunnan Province,SW China：Nd,Sr and Pb Isotopic Characteristics and Chronology |
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| 引用本文： | 常向阳,朱炳泉,莫向云.Geochemical Studies of Sodium Enriched Metavolcanite Series in the Area of Longbohe Copper Deposit,Yunnan Province,SW China：Nd,Sr and Pb Isotopic Characteristics and Chronology[J].中国地球化学学报,2002,21(2):163-169. |
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| 作者姓名： | 常向阳 朱炳泉 莫向云 |
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| 作者单位： | [1]GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Wushan,Guangzhou510640,China [2]InstituteofGeology,YunnanBureauofNon－FerrousGeologyandExploration,Kunming,650051,China |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： |
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| 关 键 词： | 地球化学 钠富集规律 云南 钕 锶 铅 铜矿床 |
Geochemical studies of sodium enriched metavolcanite series in the Area of Longbohe copper deposit,Yunnan Province,SW China: Nd,Sr and Pb isotopic characteristics and chronology |
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| Chang?Xiangyang,Zhu?Bingquan,Mo?Xiangyun.Geochemical studies of sodium enriched metavolcanite series in the Area of Longbohe copper deposit,Yunnan Province,SW China: Nd,Sr and Pb isotopic characteristics and chronology[J].Chinese Journal of Geochemistry,2002,21(2):163-169. |
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| Authors: | Chang Xiangyang Zhu Bingquan Mo Xiangyun |
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| Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, 510640 Guangzhou, China;(2) State Key Lab. of Environmental Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(3) Institute of Geology, Yunnan Bureau of Non-Ferrous Geology and Exploration, 650051 Kunming, China |
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| Abstract: | The chronological data obtained by a variety of dating methods have confirmed that the sodium enriched metavolcanite series
in the area of the Longbohe copper deposit at Jinping, Yunnan Province, was formed during the Proterozoic (its Pb−Pb isochron
age=1595±75 Ma), corresponding to the Dahongshan Group sodium enriched metavolcanites. The Sm−Nd isochron age of 1336±46Ma
should represent the time at which this series of volcanic rocks experienced spilitization in response to sodium metasomatism,
equivalent to the time of sedimentation of the Ailaoshan Group and Yashan Group rocks. The Rb−Sr ages of the volcanic rocks
and the Pb−Pb ages of copper ores have recorded the events of strong dynamic metamorphism and of strong reworking-metallogenesis
of copper during the Jinningian period. Similarities in forming age, rock assemblage and isotopic characteristics between
the sodium enriched metavolcanite series and the Dahongshan Group sodium enriched metavolcanite series have provided new clues
to the exploration of the Dahongshan-type copper deposits in this area.
Granted jointly by the National Natural Science Foundation of China (Nos. 49702022, 40073001) and the State 973 Program (No.
G1999043215). |
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| Keywords: | geochronology Proterozoic sodium enriched metavolcanite Longbohe copper deposit |
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