| 鄂东南地区Cu-Au-Mo-(W)矿床的成矿时代及其成矿地球动力学背景探讨：辉钼矿Re-Os同位素年龄 |
| 点此下载全文 |
| 引用本文：谢桂青，毛景文，李瑞玲，张祖送，赵维超，屈文俊，赵财胜，魏世昆.2006.Metallogenic epoch and geodynamic framework of Cu-Au-Mo-(W) deposits in Southeastern Hubei Province: Constraints from Re-Os molybdenite ages [J].Mineral Deposits,25(1):43~52 |
| Hits: 3853 |
| Download times: 3400 |
|
| 基金项目:国家自然科学重点基金（40434011）、国家自然科学青年基金（40402011）、中国地质调查局项目（200310200081）、中国地质大学地质过程与矿产资源国家重点实验室基金(GPM40504)、中国科学院创新项目(KZCX3_SW_125)、中国科学院地球化学研究所开放研究实验室基金（200402）和中国博士后项目 |
|
| 中文摘要:鄂东南地区Cu-Au-Mo-(W)矿床是长江中下游地区金属成矿带的重要组成部分。本文利用Re-Os同位素定年方法对该地区5个典型矿床（丰山洞铜钼金银多金属矿床、阮家湾钨铜钼矿床、千家湾铜金矿床、铜绿山铜铁金钼多金属矿床和铜山口铜钼矿床）进行了成矿时代的研究，获得其辉钼矿Re-Os同位素年龄分别为（144.0±2.1）Ma、（143.6±1.7）Ma、（137.7±1.7）Ma、（137.8±1.7）～（138.1 ±1.8）Ma和（143.5±1.7）～（142.3±1.8）Ma，代表各矿床的成矿时代。研究结果表明，鄂东南矿集区内的Cu-Au-Mo-(W)矿床与铜陵、安庆、九瑞矿集区内的矿床几乎是同时形成的，成矿时代可能主要集中于（140±5）Ma，相当于晚侏罗世_早白垩世。在综合已有的岩石学、地球化学和地球物理学资料的基础上，笔者认为，这一成矿事件的深部动力学过程可能是处于中国东部南北向印支期构造域向北东向古太平洋构造域大转折的背景下，与软流圈上涌和玄武质岩浆底侵而导致壳幔同熔有关。 |
| 中文关键词:地质学 Re-Os同位素年龄 辉钼矿 Cu-Au-Mo-(W)矿床 地球动力学背景 鄂东南地区 |
| |
| Metallogenic epoch and geodynamic framework of Cu-Au-Mo-(W) deposits in Southeastern Hubei Province: Constraints from Re-Os molybdenite ages |
|
|
| Abstract:Cu-Au-Mo- (W) deposits in southeastern Hubei Province constitute one of the important areas in the Middle-Lower Yangtze River metallogenic belt. Re-Os ages for molybdenite provide constraints on the ore_forming epoch of Late Mesozoic Cu-Au-Mo-(W) mineralization. Molybdenites from the Fengshangdong Cu-Mo-Au-Ag deposit, the Ruanjiawan W-Cu-Mo deposit, the Qianjiawan Cu-Au deposit, the Tonglushan Cu-Fe-Au-Mo deposit and the Tongshanko Cu-Mo deposit yield ages of (144.0±2.1) Ma, (143.6±1.7) Ma, (137.7±1.7) Ma, (137.8±1.7)～(138.1±1.8) Ma and (143.5±1.7)～(142.3±1.8) Ma, respectively. These data and other highly precise isotopic ages available for Cu-Fe-Au polymetallic deposits in the Middle-Lower Yangtze River metallogenic belt such as molybdenite Re-Os ages and mica 40Ar-39Ar ages in the literature demonstrate that Cu-Au-Mo- (W) deposits in Tongling, Anqing, Jiurui and eastern Hubei ore cluster areas were formed at of (140±5) Ma, reflecting an important ore_forming episode in this belt. Previous petrological and geophysical data as well as metallogenic ages and their relation to the magmatism and geodynamic framework indicate that largescale Cu-Au-Mo- (W) deposits were developed during the tectonic transformation from the NS-trending compressional regime to NE-trending extension, which resulted from asthenospheric upwelling and basaltic magma underplating in the Late Jurassic_Early Cretaceous period in East China. |
| keywords:geology, Re-Os isotope age, molybdenite, Cu-Au-Mo- (W) deposit, geodynamic framework, southeastern Hubei Province |
| View Full Text View/Add Comment Download reader |
