| 长江中下游成矿带岩浆-成矿系统深部背景和过程的电性结构约束 |
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| 引用本文： | 张昆,吕庆田,满祖辉,兰学毅,郭东,陶龙,赵金花.长江中下游成矿带岩浆-成矿系统深部背景和过程的电性结构约束[J].岩石学报,2022,38(2):573-583. |
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| 作者姓名： | 张昆 吕庆田 满祖辉 兰学毅 郭东 陶龙 赵金花 |
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| 作者单位： | 中国地质科学院, 北京 100037;中国地质调查局中国地质科学院地球深部探测中心, 北京 100037;中国地质科学院, 北京 100037;中国地质调查局中国地质科学院地球深部探测中心, 北京 100037;中国地质大学(武汉), 武汉 43007;安徽省勘查技术院, 合肥 230041 |
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| 基金项目： | 本文受安徽省公益性地质工作项目（2018-g-1-4）、国家自然科学基金项目（42174087）与国家重点研发计划项目（2016YFC0600201）联合资助. |
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| 摘 要： | 长江中下游成矿带是我国重要的铁铜金属"仓库",然而,关于矿体密集分布成因的深部背景研究仍存较多争议,前人相继提出了碰撞变形、俯冲变形、构造机制转换等多种解释模型.本文基于成矿系统概念和前人对成矿系统各组成要素的研究成果,分析长江中下游成矿带内宁芜、庐枞、南陵-宣城和安庆-贵池矿集区的深部电性结构,并发现成矿带地壳深部普...
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| 关 键 词： | 岩浆-成矿系统 长江中下游成矿带 下地壳部分熔融 深部背景和过程 物质迁移 |
| 收稿时间： | 2021/8/17 0:00:00 |
| 修稿时间： | 2021/12/8 0:00:00 |
Electrical constraints on the deep setting and process of magma-mineral system in the Middle-Lower Reaches of Yangtze Metallogenic Belt |
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| ZHANG Kun,LüQingTian,MAN ZuHui,LAN XueYi,GUO Dong,TAO Long,ZHAO JinHua.Electrical constraints on the deep setting and process of magma-mineral system in the Middle-Lower Reaches of Yangtze Metallogenic Belt[J].Acta Petrologica Sinica,2022,38(2):573-583. |
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| Authors: | ZHANG Kun LüQingTian MAN ZuHui LAN XueYi GUO Dong TAO Long ZHAO JinHua |
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| Institution: | Chinese Academy of Geological Sciences, Beijing 100037, China;China Deep Exploration Center, China Geological Survey & Chinese Academy of Geological Sciences, Beijing 100037, China;Chinese Academy of Geological Sciences, Beijing 100037, China;China Deep Exploration Center, China Geological Survey & Chinese Academy of Geological Sciences, Beijing 100037, China;China University of Geosciences(Wuhan), Wuhan 43007;Geological Exploration Technology Institute of Anhui Province, Hefei 230041, China |
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| Abstract: | The Middle-Lower Reaches of Yangtze Metallogenic Belt is an important "warehouse" of iron and copper metals in China. However, there are still disputes over the deep setting of genesis of ore bodies and its dense distribution, including collision deformation, subduction deformation and tectonic mechanism transformation. Considering about the previous points of the mineral system, we analyze the deep electrical structure of Ningwu, Luzong, Nanling-Xuancheng and Anqing-Guichi ore districts in the study region, and find a widespread conductive system in the crust. From the observations, two associated structures can be inferred with magma-mineral system:(1) The large-scale conductive layer in the lower crust indicates the space of partial melting of crustal material and underplating material mixing from the upper mantle; (2) The vertically conductive belts represent the ore controlling tunnels connected with the deep conductive layer. The structures indicate a homologous electrical feature for the iron-copper mineral system in our study area. Based on the geo-electrical models and the previous geophysical and geochemical study results, we suggest that the mixed material of the lower crust and upper mantle not only provided magmatic hydrothermal solutions for the widely distributed medium-acid magmatic rocks in the region, but also served as the material source of metals for this mineral system. Moreover, the tunnels controlled the diagenesis and mineralization in the upper crust, following the regional stress conversion. We then estimated the development time of these tunnels, and suggest the transformation of regional tectonic system has experienced ca. 10Myr, including two stages. In the early stage, the migration path of copper bearing hydrothermal solution was long and narrow, leading to mixing with more crustal materials. In the late stage, the migration channel of iron bearing hydrothermal solution was wider, lacking of secondary crust-mantle interaction. |
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| Keywords: | Magma-mineral system The Middle-Lower Reaches of Yangtze Metallogenic Belt Partial melting in the lower crust Deep setting and process Mineral migration |
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