内蒙古东乌旗沙麦钨矿床的成矿时代

李俊建; 付超; 唐文龙; 李惠民; 林源贤; 张彤; 王守光; 赵泽霖; 党智财; 赵丽君

内蒙古东乌旗沙麦钨矿床的成矿时代

1. 中国地质调查局天津地质调查中心, 天津 300170;
2. 内蒙古自治区地质调查院, 内蒙古呼和浩特 010020;
3. 中国地质科学院研究生部, 北京 100037

收稿日期: 2015-10-23

修回日期: 2016-02-29

刊出日期: 2016-04-15

The metallogenic age of the Shamai wolframite deposit in Dong Ujimqin Banner, Inner Mongolia

1. Tianjin Center, China Geological Survey, Tianjin 300170, China;
2. Inner Mongolia Bureau of Geological Survey, Hohhot 010020, Inner Mongolia, China;
3. Graduate School of Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 23 October 2015

Revised Date: 29 February 2016

Publish Date: 15 April 2016

摘要

摘要: 内蒙古东乌旗沙麦钨矿位于贺根山断裂带以北的兴蒙造山系二连-东乌旗弧盆带内,为岩浆期后高温热液黑钨矿石英脉型矿床。采用黑钨矿Sm-Nd同位素分析获得黑钨矿的形成年龄为137.9±1.7Ma,采用TIMS锆石U-Pb同位素定年获得赋矿黑云母花岗岩的形成年龄为139.1±0.93Ma,据此提出,沙麦钨矿床的形成时代为燕山晚期,这与区域上大兴安岭西坡主要金属矿床的形成年龄数据相吻合。黑钨矿的初始ε_Nd值为正值,与中亚造山带内大量花岗岩的ε_Nd值均为正值的特点相一致,表明其来源于亏损地幔源。
Abstract: The Shamai wolframite deposit in Dong Ujimqin Banner of Inner Mongolia is located within the Erlian-Dong Ujimqin Banner arc-basin belt in the Da Hinggan Mountains-Inner Mongolia orogenic belt south of the Ergenshan fault. It is a postmagmatic high-temperature hydrothernal deposit. In this paper, wolframite Sm-Nd isotope analysis of the deposit yielded an ore formation age of 137.9±1.7Ma, whereas TIMS zircon U-Pb dating of samples from the wall rock biotite granite yielded a petrogenetic age of 139.1±0.93Ma. These isotopic ages indicate that the mineralization of Shamai wolframite deposit occurred in late Yanshanian, consis-tent with the age of the formation of the main ore deposits on the west slope of the Da Hinggan Mountains regionally. Consistent with the positive initial ε_Nd value of granites scattered in central Asian orogenic belt, the initial ε_Nd value of the wolframite is posi-tive, indicating a depleted mantle source.
- wolframite /
- biotite granite /
- zircon U-Pb age /
- Sm-Nd isotope age /
- Shamai

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内蒙古东乌旗沙麦钨矿床的成矿时代

1. 中国地质调查局天津地质调查中心, 天津 300170;2. 内蒙古自治区地质调查院, 内蒙古 呼和浩特 010020;3. 中国地质科学院研究生部, 北京 100037

The metallogenic age of the Shamai wolframite deposit in Dong Ujimqin Banner, Inner Mongolia

1. Tianjin Center, China Geological Survey, Tianjin 300170, China;2. Inner Mongolia Bureau of Geological Survey, Hohhot 010020, Inner Mongolia, China;3. Graduate School of Chinese Academy of Geological Sciences, Beijing 100037, China

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1. 中国地质调查局天津地质调查中心, 天津 300170;
2. 内蒙古自治区地质调查院, 内蒙古呼和浩特 010020;
3. 中国地质科学院研究生部, 北京 100037

1. Tianjin Center, China Geological Survey, Tianjin 300170, China;
2. Inner Mongolia Bureau of Geological Survey, Hohhot 010020, Inner Mongolia, China;
3. Graduate School of Chinese Academy of Geological Sciences, Beijing 100037, China