| Application of Lead Isotopes to Geochemical Exploration of Gold Deposits in Baoban , Hainan Province, China |
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| 作者姓名： | 常向阳 朱炳泉 俞受鋆 夏萍 |
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| 作者单位： | [1]DepartmentofEnvironmentalSciences,GuangzhouUniversity,Guangzhou510405,China [2]GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Wushan,Guangzhou510640,China [3]DepartmentofGeosciences,ZhongshanUniversity,Guangzhou510275,China |
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| 基金项目： | theNationalNaturalScienceFoundationofChina (GrantNo .4970 2 0 22)，theState“973”Program (G1 9990 4 32 1 5) |
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| 摘 要： | Lead isotopes have been widely applied in geochemical exploration and evaluation of ore deposits, as well as in ascertaining the age of mineralization and the source of ore fluids.Long-term practice showed that the method of lead isotope targeting is somewhat efficient for macroscopic evaluation of forecasting areas, but not powerful enough for for ecasting concealed orebodies. As the contents of U and the variation of U/Pb ratio sharply decrease with depth in the lithosphere, U-Th-Pb isotopic differentiation must have occurred during the crust-mantle e-volution. Lead isotopic ratios show a wide variation range, varying in the front of mineralizationand shallow-derived ores, but maintaining very stable in the major orebody and being usuallyclose to the average isotopic composition of the crust and mantle of the continent block fromwhich the ores were derived. Therefore, the lead isotopic composition can serve as a measure for identifying the position of mineralization. The lead isotope geochemistry was applied to the ex-ploration and evaluation of the Baoban gold deposits of Hainan Province, China. The an alyticalresults of ore veins and adjacent rocks showed that there is a correlation between the lead isotopedata and the position of orebody. Based on the experience from the Baoban gold deposits and other ore deposits in Yunnan Province, an exploration principle has been established, that is,positive anomalies of lead isotope eigenvectors for prospecting deep-seated orebodies and nega-tive anomalies of eigenvectors for enlarging lateral exploration surrounding the known deposit.The ore beds in the Erjia and Beiniu mining districts should be as signed to the deep part of the orebody and those in the Tuwaishan mining district should be the shallow part, so ore beds cor-responding to those in the Erjia and Beiniu mining districts may be found in the Tuwaishan min-ing district.
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| 关 键 词： | 铅同位素 地球化学探测 金矿床 海南 |
| 收稿时间： | 12 June 2002 |
Application of lead isotopes to geochemical exploration of gold deposits in Baoban Hainan Province,China |
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| Chang?Xiangyang,Zhu?Bingquan,Yu?Shoujun,Xia?Ping.Application of Lead Isotopes to Geochemical Exploration of Gold Deposits in Baoban , Hainan Province, China[J].Chinese Journal of Geochemistry,2003,22(3):244-252. |
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| Authors: | Chang Xiangyang Zhu Bingquan Yu Shoujun Xia Ping |
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| Institution: | (1) Department of Environmental Sciences, Guangzhou University, 510405 Guangzhou, China;(2) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Wushan, Guangzhou, China;(3) Department of Geosciences, Zhongshan University, 510275 Guangzhou, China |
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| Abstract: | Lead isotopes have been widely applied in geochemical explora tion and evaluation of ore deposits, as well as in ascertaining the age of miner alization and the source of ore fluids. Long-term practice showed that the meth od of lead isotope targeting is somewhat efficient for macroscopic evaluation of forecasting areas, but not powerful enough for forecasting concealed orebodies. As the contents of U and the variation of U/Pb ratio sharply decrease with dept h in the lithosphere, U-Th-Pb isotopic differentiation must have occurred duri ng the crust-mantle evolution. Lead isotopic ratios show a wide variation range , varying in the front of mineralization and shallow-derived ores, but maintain ing very stable in the major orebody and being usually close to the average isot opic composition of the crust and mantle of the continent block from which the o res were derived. Therefore, the lead isotopic composition can serve as a measur e for identifying the position of mineralization. The lead isotope geochemistry was applied to the exploration and evaluation of the Baoban gold deposits of Hai nan Province, China. The analytical results of ore veins and adjacent rocks show ed that there is a correlation between the lead isotope data and the position of orebody. Based on the experience from the Baoban gold deposits and other ore de posits in Yunnan Province, an exploration principle has been established, that i s, positive anomalies of lead isotope eigenvectors for prospecting deep-seated orebodies and negative anomalies of eigenvectors for enlarging lateral explorati on surrounding the known deposit. The ore beds in the Erjia and Beiniu mining di stricts should be assigned to the deep part of the orebody and those in the Tuwa ishan mining district should be the shallow part, so ore beds corresponding to t hose in the Erjia and Beiniu mining districts may be found in the Tuwaishan mini ng district. |
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| Keywords: | lead isotope geochemical exploration gold deposit Hainan Province |
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