| 蒙古国额尔登特特大型铜-钼矿床年代学与成因研究 |
| |
| 关键词:geochronology host intrusions porphyry Cu-Mo deposit Erdenet Mongolia |
| 基金项目:国家科技支撑课题 (编号: 2007BAB25B02)；地质调查项目(编号: 1212010911029) |
|
| 摘要点击次数: 4919 |
| 全文下载次数: 7990 |
| 摘要: |
| Geochronology and Origin of the Erdenet Superlarge Cu-Mo Deposit in Mongolia |
| The Erdenet ore deposit is a superlarge porphyry Cu-Mo deposit discovered in Mongolia in the 1960’s. Zircon dating with U-Pd SHRIMP and LA-MC-ICP-MS methods suggests that the host quartz diorite was emplaced at ca. 240 Ma, coeval with the ore-forming age (241.0±3.1 Ma, MSWD=1.02)dated by the molybdenite Re-Os isochron. It is thus thought that the main magmatism and mineralization took place at the end of the early Triassic and the beginning of the middle Triassic. Element geochemistry and Nd-Sr isotopes imply that quartz diorite, granodiorite, andesite and lamprophyre intruded under the island arc, and derived their materials from the upper mantle or melted younger lower crust. Sulfur and lead isotopic features and initial Os values suggest that the ore-forming materials were mainly derived from the host quartz diorite and granodiorite. The ore-forming process of the Erdenet porphyry Cu-Mo deposit was related to the subduction resulting from the closure of the Mongolia-Okhotsk ocean. |
| JIANG Si-hong,NIE Feng-jun,SU Yong-jiang,BAI Da-ming,LIU Yi-fei.2010.Geochronology and Origin of the Erdenet Superlarge Cu-Mo Deposit in Mongolia[J].Acta Geoscientica Sinica,31(3):289-306. |
| 查看全文 查看/发表评论 下载PDF阅读器 |