| 晋北火山岩型金银矿床同位素地球化学特征 |
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| 引用本文：李兆龙,张连营,骆华宝.1994.晋北火山岩型金银矿床同位素地球化学特征[J].地球学报,15(1,2):145-151. |
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| 中文摘要:晋北地区是浅成低温热液金银矿床重要分布区。金银矿床与火山岩岩体密切相关。与成矿有关的石英斑岩、石岗斑岩基 Rb-Sr等时线年龄为136-167Ma，为燕山早中期产物，（87Sr/86Sr）。为0.7058-0.7065，属幔壳混源型。铅同位素资料表明，支家地银矿和刁泉银、金、铜矿铅同位素组成与高于庄组白云岩及有关次山岩岩石铅组成相似，可能均属壳幔混合源。耿庄金矿铅同位素属异常铅。金银矿床的δ34S值分布范围为-0.8‰-+9.6‰,算术平均值为3.8‰，为岩浆热液型特征。成矿流体氢氧同位素及碳酸盐的碳氧同 |
| 中文关键词:火山岩型金银矿床 同位素地球化学 晋北 |
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| Isotope geochemistry of volcanic Au-Ag deposits in north shanxi province |
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| Abstract:In the North Shanxi occur many epithermal Au-Ag eposits which are closely related to volcanic and sub-volcanic rocks,especially to quartz porphyrite and granitic porphyrite.Their Rb-Sr ischrone age of 130-167 Ma indicate that the rocks are products of middle Yanshanian period and their initial 87Sr/86Sr of 0.7058-0.7065 suggests that they are the products of mixing of crust and mantle.The Pb isotope composition of the silver ore in the Zhijiadi Mine and the Ag-Au-Cu ore on the Diaoquan Mine is comparable to those of dolomite of Gaoyuzhang Formation and the relavent subyolcanics,probably ferived from mixed sources of crust and mantle. The Pb isotope data of Au-ore from the Gengzhuang Mine is considered to be abnormal.The δ34S values of these deposits range from -0.8‰ to 9.6‰ (arithmatic average of 3.85‰),showing characteristics of volcanic hydthermal mineralization. The δ18OH2O of ore fluid value decreases with evolution as result of more meteoric water incorporation into metallogeny. |
| keywords:Au-Ag deposits of volcanic type isotope geochemistry North Shanxi |
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