| 李兆龙,张连营,骆华宝.晋东北地区中生代次火山岩及金银成矿作用地球化学[J].地质找矿论丛,1995,(1):1-8 |
| 晋东北地区中生代次火山岩及金银成矿作用地球化学 |
| ISOTOPE GEOCHEMISTRY OF VOLCANIC Au-Ag DEPOSITS IN NORTH SHANXI PROVINCE |
| 投稿时间：1994-01-01 修订日期：1995-01-01 |
| DOI：10.6053/j.issn.1001-1412.1995.1. 001 |
| 中文关键词: 次火山岩 金银矿床 地球化学 |
| 英文关键词: |
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| 摘要点击次数: 1071 |
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| 中文摘要: |
| 晋东北地区是金银矿床成矿有利地区,本文通过该区次火山岩Rb-Sr同位素及次火山岩和金银矿的稳定同位素研究,揭示了次火山岩和金银矿的生成时代及它们成因的内在联系,并指出了找矿标志。 |
| 英文摘要: |
| In the North Shanxi province occur many epithermal Au-Ag deposits which are closely related to volcanic and sub volcanic rocks, especially to quartz porphyrite and granitic porphyrite.Rb Sr isochron age of 130-167 Ma indicate that the rocks are product of middle Yanshanian Period and 87Sr/86Sr=0.7058-0.7065 suggests that they are the products of mixation of crust and mantle.Pb isotope composition of silver ore in Zhijiadi Mine and Ag-Au-Cu ore in Diaoquan Mine is comparable to those of dolomite of Gaoyuzhuang Formation and the relavent subvolcanics, probably derived from mixed sources of crust and mantle.Pb isotope analysis of Au ore from Gengzhuang Mine is considered abnormal Pb.δ34S value of electrum is ranged as -0.8+9.6%(arithmatic average of 3.85%) riched in δ34S showing characteristics of volcanic hydrothermal minerals.Ore fluid δ18OH2O value decreases with evolution as a result of more meteoric water incorporation into metallogeny. |
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