| Lead in K－Feldspar and Its Relations to Rb Metallogenesis |
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| 引用本文： | 张乾,刘志浩,裘愉卓,高计元,王一先.Lead in K－Feldspar and Its Relations to Rb Metallogenesis[J].中国地球化学学报,2003,22(2):107-115. |
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| 作者姓名： | 张乾 刘志浩 裘愉卓 高计元 王一先 |
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| 作者单位： | [1]InsitituteofGeochemistry,ChineseAcademyofSciences,Guiyang550002,China [2]GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Wushan,Guangzhou510640,China |
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| 基金项目： | JointlygrantedbythePre selectedProject( 95 Yu 2 5)undertheClimbingProgramsponsoredbytheChinaNationalScienceandTechnologyMinistryandtheStateKeyBasicResearchProgram (G19990 43 2 0 8) |
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| 摘 要： | In intermediate-acid magmatic rocks,alkaline magmatic rocks,gneisses and migmatitic rocks K-feldspar is a rock-forming rock in which the contents of Pb are highest,just 2-10 times those of the whole rock,3-16 times those of mica minerals and 6-32 times those of quartz.The lowest contents of K-feldspar are recognized in Early Proterozoic and Achaean rocks,with Pb in the K-feldspar accounting for less than 10% of that in the whole rock;in post Middle Proterozoic alkaine magmatic rocks,K-feldspar-rich granites and metamorphic rocks the contents of K-feldspar tend to increase,with the proportion granites and metamorphic rocks the contents of K-feldspar tend to increase,with the proportion of Pb over that in the whole rock being obviously increased.In the alkaline rocks in which K-feldspar accounts for 50%-70% of the total in the whole rock,the contents of Pb in K-feldspar account approximately for 70%-95% of the total lead in the whole rock.Being accessible to hydrothermal alteration in the late periods,K-feldspar was conversed to sericite,calcite,quartz,etc.In the process of such conversion the lead would be leached out and then find its way into fluid phase.This kind of trans-formation can provide sufficient ore-forming material for later Pb metallogenesis.
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| 关 键 词： | 岩石 铅矿床 铷 钾长石 地球化学 金属成矿作用 流体相 |
Lead in K-feldspar and its relations to PB metallogenesis |
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| Zhang Qian,Liu Zhihao,Qiu Yuzuo,Gao Jiyuan,Wang Yixian.Lead in K-feldspar and its relations to PB metallogenesis[J].Chinese Journal of Geochemistry,2003,22(2):107-115. |
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| Authors: | Zhang Qian Liu Zhihao Qiu Yuzuo Gao Jiyuan Wang Yixian |
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| Institution: | (1) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, 510640 Guangzhou, China |
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| Abstract: | In intermediate-acid magmatic rocks,alkaline magmatic rocks,gneisses and migmatitic rocks K-feldspar is a rook-forming rock in which the contents of Pb are highest,just 2-10 times those of the whole rock,3-16 times those of mica minerals and 6-32 times those of quartz.The lowest contents of K-feldspar are recognized in Early Proterozoic and Achaean rocks,with Pb in the K-feldspar accounting for less than 10% of that in the whole rock;in post-Middle Proterozoic alkaline magmatic rocks,K-feldspar-rich granites and metamorphic rocks the contents of K-feldspar tend to increase,with the proportion of Pb over that in the whole rock being obviously increased.In the alkaline rocks in which K-feldspar accounts for 50%-70%of the total in the whole rock,the contents of Pb in K-feldspar account approximately for 70%-95% of the total lead in the whole rock.Being accessible to hydrothermal alteration in the late periods,K-feldspar was conversed to sericite,calcite,quartz,etc.In the process of such conversion the lead would be leached out and then find its way into fluid phase.This kind of trans-formation can provide sufficent ore-forming material for later Pb metallogenesis. |
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| Keywords: | rock K-feldspar Pb-bearing potential variation characteristic metallo- genesis |
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