| 安徽贵池矿集区深部精细结构——来自综合地球物理探测结果的认识 |
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| 引用本文： | 邵陆森,刘振东,吕庆田,严加永,张昆,赵金花,祁光,张亚伟.安徽贵池矿集区深部精细结构——来自综合地球物理探测结果的认识[J].地球物理学报,2015,58(12):4490-4504. |
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| 作者姓名： | 邵陆森 刘振东 吕庆田 严加永 张昆 赵金花 祁光 张亚伟 |
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| 作者单位： | 1. 中国地质科学院矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100037;2. 中国地质科学院地球深部探测中心, 北京 100037;3. 中国地质科学院地球物理地球化学勘查研究所, 河北廊坊 065000 |
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| 基金项目： | 地质大调查项目(1212011220243),国家科技专项(SinoProbe-03)与科技支撑计划项目(2011BAB04B01)联合资助. |
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| 摘 要： | 安徽贵池矿集区是长江中下游成矿带中重要的铜多金属矿集区,随着浅表找矿难度的加大,急需了解矿集区深部结构为深部找矿提供深部找矿提供指示.为揭示贵池矿集区深部地壳结构格架、控岩、控矿构造和岩浆系统的空间结构,深化对成矿作用的认识,在该区实施了两条长度各约60km垂直于构造走向的反射地震和MT探测剖面,通过对MT数据有针对性的去噪和反演,获得了研究区10km以浅的地电结构;通过对反射数据的层析反演静校正、叠前保幅多域去噪、精细速度分析和叠前时间偏移等处理,获取了该地区地壳结构的地震成像剖面.结合区域地质构造背景和针对性处理的区域重磁数据,对两条综合探测剖面的反演处理结果进行了分析与解释,研究发现了本区地层的构造反射特征、地壳结构特征和Moho特征,厘定了盖层与基底之间的区域滑脱面、中下地壳滑脱面和Moho面的深度和形态.发现了地壳上冲和俯冲的反射特征,可能是华夏块体与扬子块体晋宁期发生板内碰撞的痕迹.高坦断裂是一个深达地壳级的断裂,其南北两侧具有不同的重磁特征、电性结构特征和地震反射特征,该断裂可能是深部流体上涌的通道,岩浆和地幔热液沿断裂上涌并沿地层和裂隙侵入中上地壳,形成岩基或岩体,或与围岩发生强烈矿化作用形成贵池矿集区多金属矿床.
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| 关 键 词： | 贵池矿集区 深部结构 反射地震 大地电磁 高坦断裂 电性结构 莫霍面 |
| 收稿时间： | 2015-05-06 |
Deep fine structure of Guichi Ore concentrated area: The understanding of the integrated geophysical detection results |
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| SHAO Lu-Sen,LIU Zhen-Dong,LV Qing-Tian,YAN Jia-Yong,ZHANG Kun,ZHAO Jin-Hua,QI Guang,ZHANG Ya-Wei.Deep fine structure of Guichi Ore concentrated area: The understanding of the integrated geophysical detection results[J].Chinese Journal of Geophysics,2015,58(12):4490-4504. |
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| Authors: | SHAO Lu-Sen LIU Zhen-Dong LV Qing-Tian YAN Jia-Yong ZHANG Kun ZHAO Jin-Hua QI Guang ZHANG Ya-Wei |
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| Institution: | 1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. China Deep Exploration Center—SinoProbe Center, Chinese Academy of Geological Sciences, Beijing 100037, China;3. IGGE, Hebei Langfang 065000, China |
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| Abstract: | For the purpose of revealing the deep tectonic background, the crustal structure framework, the spatial structure of magma system and the deep conductivity structure of Guichi ore concentrated area, two magnetotelluric (MT) sounding and seismic reflection profiles each about 60 km long have been conducted perpendicular to geologic strike. The underground conductivity structures extending from the shallow surface down to 10 km have been worked out after denoising and inversion. The regional crustal structure seismic imaging section is gained based on the tomographic static, prestack multi-domain noise attenuation, fine velocity analysis and prestack time migration. In combination with regional geological tectonic setting and the results of regional magnetic and gravity data, the inversion processing results of two comprehensive profiles are analyzed and explained. The formation of the tectonic reflection characteristics, characteristics of crust structure and the characteristics of Moho are founded through the work. The decollement surface between the cover and basement, the detachment surface between middle and lower crust and the depth and type of Moho are confirmed. It is found that the reflection characteristics of the earth's crust and the subduction are the traces of plate collision between the Cathaysia block and the Yangtze block occurred within Jinning period. The Gaotan fault is a fracture deep into the earth's crust, the characteristics of magnetic and gravity, the electrical characteristics and the seismic reflection characteristics are different beside the fault. it is believed that the fault is the upwelling channel of the deep fluid. The mantle hydrothermal and magma intrusive into upper crust along the fracture and formed the batholith or rock mass along the strata and fractures. The polymetallic deposits in Guichi ore concentrated area are formed by the strong mineralization with surrounding rock. |
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| Keywords: | Guichi ore concentrated area Deep structure Reflection seismic Magnetotelluric Gaotan fault The electrical structure Moho surface |
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