| Single grain Rb-Sr dating of euhedral and cataclastic pyrite from the Qiyugou gold deposit in western Henan, central China |
| |
| 作者姓名： | HAN YiGui LI XiangHui ZHANG ShiHong ZHANG YuanHou CHEN FuKun |
| |
| 作者单位： | [1]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China; [2]Laboratory for Radiogenic Isotope Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China [3]The College of Earth Sciences, Jilin University, Changchun 130061, China |
| |
| 基金项目： | Supported jointly by the National Natural Science Foundation of China (Grant No.40032010-B) and the National Basic Research Program of China (Grant No.2006CB403505) |
| |
| 摘 要： | The Rb-Sr isotopic dating of pyrite mineral from ore deposits can directly provide mineralization age. However, many geological factors may affect the Rb-Sr isotopic system,which baffles application of this method. Employing ultra-low procedural blank Rb-Sr method,we have dated pyrites separated from the No. 4 breccia pipe of the Qiyugou gold deposit,western Henan Province. Single grains of euhedral pyrite crystal with few microcracks yield an isochron age of 126 ± 11 Ma, which represents time of the main mineralization stage of the deposit. Pyrite grains of cataclastic type show nevertheless scattered Rb-Sr isotopic composition and no reasonable isochron can be defined. Crystal morphology and mineral inclusion studies reveal that Rb and Sr of pyrite mineral probably are preserved mainly in biotite, K-feldspar, and sericite mineral inclusions. The dating results likely suggest that cataclastic pyrite is not suitable for the Rb-Sr dating due to modification of the Rb-Sr isotopic system by later hydrothermal activity of fluid.
|
| 关 键 词： | 硫化铁矿 年代测定 铷 锶 形成时间 |
| 收稿时间： | 6 December 2006 |
| 修稿时间： | 2006-12-062007-04-13 |
Single grain Rb-Sr dating of euhedral and cataclastic pyrite from the Qiyugou gold deposit in western Henan,central China |
| |
| HAN YiGui LI XiangHui ZHANG ShiHong ZHANG YuanHou CHEN FuKun.Single grain Rb-Sr dating of euhedral and cataclastic pyrite from the Qiyugou gold deposit in western Henan, central China[J].Chinese Science Bulletin,2007,52(13):1820-1826. |
| |
| Authors: | Han YiGui Li XiangHui Zhang ShiHong Zhang YuanHou Chen FuKun |
| |
| Institution: | (1) State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China;(2) Laboratory for Radiogenic Isotope Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;(3) The College of Earth Sciences, Jilin University, Changchun, 130061, China |
| |
| Abstract: | The Rb-Sr isotopic dating of pyrite mineral from ore deposits can directly provide mineralization age. However, many geological
factors may affect the Rb-Sr isotopic system, which baffles application of this method. Employing ultra-low procedural blank
Rb-Sr method, we have dated pyrites separated from the No. 4 breccia pipe of the Qiyugou gold deposit, western Henan Province.
Single grains of euhedral pyrite crystal with few micro-cracks yield an isochron age of 126 ± 11 Ma, which represents time
of the main mineralization stage of the deposit. Pyrite grains of cataclastic type show nevertheless scattered Rb-Sr isotopic
composition and no reasonable isochron can be defined. Crystal morphology and mineral inclusion studies reveal that Rb and
Sr of pyrite mineral probably are preserved mainly in biotite, K-feldspar, and sericite mineral inclusions. The dating results
likely suggest that cataclastic pyrite is not suitable for the Rb-Sr dating due to modification of the Rb-Sr isotopic system
by later hydrothermal activity of fluid.
Supported jointly by the National Natural Science Foundation of China (Grant No. 40032010-B) and the National Basic Research
Program of China (Grant No. 2006CB403505) |
| |
| Keywords: | pyrite Rb-Sr dating single grain ultra-low procedural blank Qiyugou |
| 本文献已被 维普 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |
|
