| 冈底斯成矿带东段的电性结构特征研究 |
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| 引用本文： | 王刚,魏文博,金胜,张乐天,董浩,谢成良,郭泽秋.冈底斯成矿带东段的电性结构特征研究[J].地球物理学报,2017,60(8):2993-3003. |
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| 作者姓名： | 王刚 魏文博 金胜 张乐天 董浩 谢成良 郭泽秋 |
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| 作者单位： | 1. 中国地质大学(北京)地球物理与信息技术学院, 北京 100083;2. 地质过程与矿产资源国家重点实验室, 北京 100083 |
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| 基金项目： | 国家深部探测技术与实验研究专项（SinoProbe-01-01及SinoProbe-01-02），中央高校基本科研业务费专项资金（53200859526）和地下信息探测技术与仪器教育部重点实验室（中国地质大学，北京）开放课题项目（GDL1501）共同资助. |
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| 摘 要： | 冈底斯成矿带为我国著名的成矿区域,其东段存在一系列规模较大的矿床.为了研究冈底斯成矿带东段的电性结构特征,对覆盖主要矿集区的大地电磁测深数据进行全面的处理分析,通过二维与三维反演的综合对比得到了可靠的电性结构模型.结合其他地质与地球物理资料,对电性结构模型进行分析得到冈底斯成矿带东段的矿床分布规律:矿床主要分布在地壳浅表的电性分界面附近;中地壳高导体可能通过上地壳隐伏的南-北向断裂控制着与地壳伸展作用有关的矿床;南-北向张性构造与东-西向逆冲-推覆构造的交汇部位可能是冈底斯成矿带东段重要的成矿区域;下地壳可能受到软流圈物质上涌的影响发生部分熔融,从而与中地壳的高导体共同影响地壳浅部的成矿作用.
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| 关 键 词： | 冈底斯成矿带东段 电性结构 大地电磁测深 矿床分布规律 |
| 收稿时间： | 2016-11-19 |
A study on the electrical structure of eastern Gangdese metallogenic belt |
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| WANG Gang,WEI Wen-Bo,JIN Sheng,ZHANG Le-Tian,DONG Hao,XIE Cheng-Liang,GUO Ze-Qiu.A study on the electrical structure of eastern Gangdese metallogenic belt[J].Chinese Journal of Geophysics,2017,60(8):2993-3003. |
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| Authors: | WANG Gang WEI Wen-Bo JIN Sheng ZHANG Le-Tian DONG Hao XIE Cheng-Liang GUO Ze-Qiu |
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| Institution: | 1. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China;2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The famous Gangdese metallogenic belt hosts many large ore deposits within its eastern part. In order to examine the electrical structure of this region, the magnetotelluric data covering the main ore deposits were carefully processed and analyzed. A reliable electrical model was obtained using both two-dimensional and three-dimensional inversions. Combined with other geological and geophysical observations, our electrical model reveals that the ore deposits distribution can be interpreted as: (1) Ore deposits are located in electrical boundaries in the shallow crust. (2) The conductors observed in middle crust may have played a key role in the distribution of ore deposits, through buried north-south direction faults in the upper crust. (3) We propose that the intersection regions of north-south extensional structures and east-west thrust can be regarded as important metallogenic zones. (4) The lower crust may have been influenced by the asthenospheric upwelling and then became partially melted. The partially melted lower crust, together with the conductors in middle crust may have controlled the mineralization process in the upper crust. |
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| Keywords: | Eastern Gangdese metallogenic belt Electrical structure Magnetotellurics Ore deposits distribution |
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