| 内蒙古大井铜多金属矿床脉岩LA-ICP-MS锆石U-Pb定年及成矿时代 |
| |
| 引用本文： | 刘铭涛,刘建明,薛春纪,陈向平,陈志国,冯宝山. 内蒙古大井铜多金属矿床脉岩LA-ICP-MS锆石U-Pb定年及成矿时代[J]. 地质通报, 2019, 38(8): 1306-1313 |
| |
| 作者姓名： | 刘铭涛 刘建明 薛春纪 陈向平 陈志国 冯宝山 |
| |
| 作者单位： | 天津华北地质勘查局, 天津 300170,中国科学院地质与地球物理研究所, 北京 100029,中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083,天津华北地质勘查局, 天津 300170,天津华北地质勘查局, 天津 300170,天津华北地质勘查局, 天津 300170 |
| |
| 基金项目： | 地方政府委托中国科学院地质与地球物理研究所项目《赤峰市有色金属成矿规律研究》 |
| |
| 摘 要： | 内蒙古林西县大井矿床是与次火山岩有关的热液脉型矿床,矿体受NW向、NWW向断裂控制,产出在二叠系林西组中。用LA-ICP-MS技术,测得成矿前的霏细岩脉和安山玢岩脉中的锆石~(206P)b/~(238)U年龄分别为164.1±0.8Ma(MSWD=0.60,n=16)和253.8±1.1Ma(MSWD=0.96,n=14)。其中霏细岩锆石年龄表明,其形成可能与西伯利亚板块和蒙古-华北板块之间的鄂霍茨克洋碰撞造山有关;安山玢岩可能与华北板块与西伯利亚板块碰撞造山有关。通过成矿前脉岩的锆石年龄,可以限定大井矿床的成矿时代晚于164Ma。结合前人研究结果,推测大井铜多金属矿床的形成主要受控于晚侏罗世—早白垩世岩浆活动。
|
| 关 键 词： | 大井 LA-ICP-MS锆石U-Pb定年 成矿年代 晚侏罗世-早白垩世 霏细岩 安山玢岩 |
| 收稿时间： | 2018-04-07 |
| 修稿时间： | 2018-08-22 |
LA-ICP-MS zircon U-Pb dating of dikes in the Dajing copperpolymetallic deposit and a discussion on the metallogenic epoch |
| |
| LIU Mingtao,LIU Jianming,XUE Chunji,CHEN Xiangping,CHEN Zhiguo and FENG Baoshan. LA-ICP-MS zircon U-Pb dating of dikes in the Dajing copperpolymetallic deposit and a discussion on the metallogenic epoch[J]. Geologcal Bulletin of China, 2019, 38(8): 1306-1313 |
| |
| Authors: | LIU Mingtao LIU Jianming XUE Chunji CHEN Xiangping CHEN Zhiguo FENG Baoshan |
| |
| Affiliation: | Tianjin North China Geological Exploration Bureau, Tianjin 300170, China,Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China,State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China,Tianjin North China Geological Exploration Bureau, Tianjin 300170, China,Tianjin North China Geological Exploration Bureau, Tianjin 300170, China and Tianjin North China Geological Exploration Bureau, Tianjin 300170, China |
| |
| Abstract: | The Dajing deposit was previously regarded as a magmatic hydrothermal type deposit.The orebodies are controlled by the NW-and NWW-trending faults and occur in Permian Linxi Formation. The zircon samples collected during the research were dated by using LA-ICP-MS zircon U-Pb method, and the authors obtained the following results:the zircon U-Pb ages are 164.1±0.8Ma (MSWD=0.60, n=16) and 253.8 ±1.1Ma (MSWD=0.96, n=14) for felsite dikes and andesite porphyry dikes, respectively. Felsite dikes were formed in a collisional setting probably related to the closure of Mongolia-Okhotsk Ocean and post collision, while andesite porphyry dikes were formed in a tectonic setting possibly related to the collision between Siberian Plate and North China Plate. Based on the zircon U-Pb ages of dikes obtained, the authors have reached the conclusion that the ore-forming process of the Dajing polymetallic deposit occurred later than 164Ma. The most intense volcanic-magmatic activities of the Da Hinggan Mountains took place during Middle Yanshanian period. It is therefore held that the ore-forming process of the Dajing polymetallic deposit occurred approximately in Late Jurassic-Early Cretaceous. |
| |
| Keywords: | Dajing LA-ICP-MS zircon U-Pb dating metallogenic epoch Late Jurassic-Early Cretaceous felsite andesite porphyry |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
|
点击此处可从《地质通报》下载全文 |
|
