| 晋北火山岩型金银矿床同位素地球化学特征 |
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| 关键词:Au-Ag deposits of volcanic type isotope geochemistry North Shanxi |
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| Isotope geochemistry of volcanic Au-Ag deposits in north shanxi province |
| 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. |
| LI Zhao-long,ZHANG Lian-ying,LUO Hua-bao.1994.Isotope geochemistry of volcanic Au-Ag deposits in north shanxi province[J].Acta Geoscientica Sinica,15(1,2):145-151. |
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