| 陕西煎茶岭金矿区的岩石及成矿时代研究 |
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| 引用本文： | 黄婉康,甘先平.陕西煎茶岭金矿区的岩石及成矿时代研究[J].地球化学,1996,25(2):150-156. |
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| 作者姓名： | 黄婉康 甘先平 |
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| 作者单位： | 中国科学院广州地球化学研究所，有色金属总公司西北地勘局７１１总队，有色金属总公司西北地质研究所 |
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| 摘 要： | 陕西煎茶岭矿区的超基性岩体侵位后，在后期强烈的构造－岩浆活动及富ＣＯ２流体作用下，超基性岩蚀变为纤胶蛇纹岩。后来在绿片岩一低角闪岩相的条件下发生了叶蛇纹石化的进变质作用，与此同时，基性基蚀变为异剥钙榴岩。钠长斑岩中钠长石的Ｋ－Ａｒ年龄为３７２Ｍａ。它表明矿区内酸性岩浆主要时期是在３３７－４００Ｍａ之间。与金矿化关系密切的铬水云母Ｋ－Ａｒ年龄是１４４Ｍａ。它暗示本矿区的金矿化有可能形成于中－晚燕山期
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| 关 键 词： | 金矿床 钾 氩 同位年龄 岩石 成矿时代 |
A STUDY OF PETROLOGY AND METALLOGENETIC EPOCH OF GOLD IN JIANCHALING DEPOSIT,SHAANXI PROVINCE |
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| Huang Wankang,Gan Xianping,Shan Zuxiang,Chen Lixiang,Liu Yan.A STUDY OF PETROLOGY AND METALLOGENETIC EPOCH OF GOLD IN JIANCHALING DEPOSIT,SHAANXI PROVINCE[J].Geochimica,1996,25(2):150-156. |
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| Authors: | Huang Wankang Gan Xianping Shan Zuxiang Chen Lixiang Liu Yan |
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| Abstract: | After the emplacement of ultrabasic rock in Jianchaling gold mine area,Shaanxi Province,the harzburgites were altered to serpentites under the action of CO2-rich fluid during the later structure-magma stage.Then,the progressive metamorphism of antigorite were happened in the rocks on the condition of green schist to low amphibolite facies,and the mafic rock in the area were metamorphized to form the rodingite.The K-Ar isotope age of albite phenocryst in albitophyre vein is 372Ma,while that of the ground mass in the rock is 337Ma.It means that the acid magmatic activity occurred mainly during 337-400Ma in this area.The K-Ar isotope age of chrome-hydromica associated with the gold mineralization is 144Ma.This implies that the metallogenetic epoch of gold in Jianchaling might be happened in Middle to Later Yanshan movement and related to the later tension of the deep-rift.The gold deposit related to the altered ultramafite of ophiolite is formed by the repeated actions of structure-magma in that structure zone over a long period of time. |
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| Keywords: | gold deposit K-Ar isotope age ultrabasic rock albitophyre |
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