| 北祁连山寒山金矿床成矿作用同位素地质年代学 |
| |
| 关键词:altered rock type gold deposit geochronology for mineralization magmatic activity and mi-neralization Hanshan North Qianlian Mountains |
| 基金项目:国土资源部“九五”资源与环境科技攻关项目“北祁连山西段铜、多金属矿产成矿条件及找矿预测研究”（编号：95-2-004） |
|
| 摘要点击次数: 2767 |
| 全文下载次数: 2544 |
| 摘要: |
| Isotopic Geochronology of the Ore-forming Process in the Hanshan Gold Deposit of the North Qilian Mountains |
| The Hanshan gold deposit, located in Anxi County within the western part of the Qinlian Mountains, is a typical epithermal and intermediate-shallow altered rock type gold deposit with gold orebodies produced in the shear zone. It occurs in Lower Ordovician andesitic-dacitic pyroclastic rocks and is controlled by the ductile-brittle shear zone. According to the mineral assemblage and the intercalation relationship, the ore-forming process of the primary hydrothermal phase can be divided into five mineralization stages. Among them, the gold-arsenomarcasite-quartz stage and the gold-stylotyp-polymetallic sulfide stage are the major gold-forming stages. Chronologic studies show that the Rb-Sr isochron age of auriferous quartz at the gold-arsenomarcasite-quartz stage is 372±8 Ma and that of thermally altered rock is 339±10 Ma. These data suggest that the igneous intrusion and the ore-forming process took place between Late Devonian and Early Carboniferous, corresponding to the period when the North Qianlian Mountains were formed and extended inland. It is therefore considered that the ore-forming process resulted from the “trinity” joint action of postorogenic structure-magma-fluids. |
| YANG Jian-guo,YANG Lin-hai,REN You-xiang,LI Zhi-pei,SONG Zhong-bao.2005.Isotopic Geochronology of the Ore-forming Process in the Hanshan Gold Deposit of the North Qilian Mountains[J].Acta Geoscientica Sinica,26(4):315-320. |
| 查看全文 查看/发表评论 下载PDF阅读器 |