| 滇西北衙金多金属矿床锆石U-Pb和辉钼矿Re-Os年龄及其地质意义 |
| |
| 引用本文： | 和文言,莫宣学,喻学惠,和中华,董国臣,刘晓波,苏纲生,黄雄飞.滇西北衙金多金属矿床锆石U-Pb和辉钼矿Re-Os年龄及其地质意义[J].岩石学报,2013,29(4):1301-1310. |
| |
| 作者姓名： | 和文言 莫宣学 喻学惠 和中华 董国臣 刘晓波 苏纲生 黄雄飞 |
| |
| 作者单位： | 1. 中国地质大学地质过程与矿产资源国家重点实验室,地球科学与资源学院,北京100083
2. 云南黄金矿业集团股份有限公司,昆明,650224 |
| |
| 基金项目： | 本文受国家重点基础研究发展计划项目(2009CB421002);国土资源部公益性行业科研专项(200911007-3)和地质过程与矿产资源国家重点实验室开放基金(GPMR2011)联合资助. |
| |
| 摘 要： | 北衙金多金属矿床位于金沙江-哀牢山富碱斑岩带中段,近年来在矿产勘查中取得重大突破,金储量已达超大型矿床规模,并伴生铁、铜、银、铅、锌等金属矿种.本文通过对矿区内石英正长斑岩进行锆石LA-ICP-MS U-Pb定年,确定其成岩年龄为36.48±0.26Ma；并对矽卡岩型矿体中的辉钼矿样品进行Re-Os同位素定年,首次获得北衙金多金属矿床高精度的成矿年龄为36.87±0.76Ma,测试结果显示成岩与成矿年龄基本一致.辉钼矿中Re含量指示成矿作用与岩浆壳幔混合作用有关.北衙金多金属矿床成岩和成矿年龄与哀牢山-金沙江富碱斑岩成矿带的成岩与成矿作用年龄相一致(40 ～ 35Ma),表明其形成受控于相同的地球动力学背景,是在印度与欧亚大陆碰撞背景下,构造体制发生转变,导致加厚下地壳或上地幔的部分熔融而引起的岩浆-热液-成矿事件.
|
| 关 键 词： | 成矿背景 锆石U-Pb年龄 Re-Os同位素年龄 北衙金多金属矿床 滇西 |
| 收稿时间： | 2012/10/7 0:00:00 |
| 修稿时间： | 2013/1/20 0:00:00 |
Zircon U-Pb and molybdenite Re-Os dating for the Beiya gold-polymetallic deposit in the western Yunnan Province and its geological significance |
| |
| HE WenYan,MO XuanXue,YU XueHui,HE ZhongHu,DONG GuoChen,LIU XiaoBo,SU Gangsheng and HUANG XiongFei.Zircon U-Pb and molybdenite Re-Os dating for the Beiya gold-polymetallic deposit in the western Yunnan Province and its geological significance[J].Acta Petrologica Sinica,2013,29(4):1301-1310. |
| |
| Authors: | HE WenYan MO XuanXue YU XueHui HE ZhongHu DONG GuoChen LIU XiaoBo SU Gangsheng and HUANG XiongFei |
| |
| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Yunnan Geology and Mineral Resources Co. Ltd, Kunming 650224, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Yunnan Geology and Mineral Resources Co. Ltd, Kunming 650224, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
| |
| Abstract: | The Beiya gold-polymetallic deposit lies in the middle of the Cenozoic Jinshajiang-Ailaoshan alkali-rich intrusion belt in the western Yunnan Province. It is a representative ore deposit in studying Himalaya epoch mineralization and shows bright future for further prospecting. The first highly precise dating of the rock-forming and mineralization in Beiya gold-polymetallic deposit is provided in this paper. The U-Pb LA-ICP-MS dating of the zircon from Hongnitang quartz syenite porphyry yields an age of 36.48±0.26Ma. Re-Os dating of molybdenite separated from the skarn ore bodies gives a model age of 36.87±0.76Ma. These ages suggest that the mineralization in the Beiya gold-polymetallic deposit is genetically associated to the quartz syenite porphyry. The Re contents of molybdenite indicate that the ore-forming materials are derived from mantle and crust. Based on the same ages of the rock-forming and mineralization in Beiya gold-polymetallic deposit and other deposits in jingshajiang-Ailaoshan metallogenic belt, it is proposed that these deposits all occurred under the background of India-Eurasia collision when the tectonic regime changing make the thickened lower crust and upper mantle melt partially. |
| |
| Keywords: | Metallogenetic setting Zircon U-Pb age Re-Os age Beiya gold-polymetallic deposit Western Yunnan Province |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《岩石学报》浏览原始摘要信息 |
| 点击此处可从《岩石学报》下载免费的PDF全文 |
|
