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引用本文:罗凡,严加永,付光明,王昊,陶鑫,罗磊. 华南地区地壳厚度变化及对成矿类型的制约:来自卫星重力数据的约束[J]. 中国地质, 2019, 46(4): 759-774.
LUO Fan,YAN Jiayong,FU Guangming,WANG Hao,TAO Xin,LUO Lei. Crust thickness and its apocalyptic of mineralization in South China: Constraint from Satellite Gravity data[J]. Geology in China, 2019, 46(4): 759-774(in Chinese with English abstract).
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华南地区地壳厚度变化及对成矿类型的制约:来自卫星重力数据的约束
罗凡1,2,3, 严加永2,3, 付光明1,2,3, 王昊2,3, 陶鑫1,2,3, 罗磊1,2,3
1.东华理工大学地球物理与测控技术学院, 江西 南昌 330013;2.中国地质科学院, 北京 100037;3.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
摘要:
华南地区是中国金属矿产资源的“大粮仓”,分布有多个多金属成矿带。多金属成矿带的形成常伴随着地下特殊的深部背景和过程,通过莫霍面深度的计算,对华南地区的地壳厚薄变化所反映的壳幔耦合关系进行研究,可为探索华南地区地下巨量金属资源的形成与演变过程提供参考。本文首先基于球坐标的重力解算方法对高阶卫星重力场模型EIGEN-6C4的数据进行校正,得到华南地区的卫星布格重力异常。然后采用改进的Parker-Oldenburg方法进行变密度界面反演,获得华南地区莫霍面起伏特征。最后结合区内不同成矿带的范围和前人发表的地质、地球化学等资料,探讨华南地区不同成矿带的成矿物质来源与莫霍面起伏的关系。认为长江中下游和钦杭东段处于莫霍面隆起区域的成矿带,幔源物质对其成矿作用起主导地位,形成以铜、铁为主的多金属矿床;南岭、武夷、钦杭西段及鄂西—湘西位于莫霍面隆-陷交替区域的成矿带,成矿与壳、幔源物质的相互作用密切相关,最终形成钨、锡、金、银、铅锌等多金属矿床。
关键词:  卫星重力数据  球面重力校正  变密度界面反演  莫霍面深度  华南地区
DOI:10.12029/gc20190407
分类号:
基金项目:中国地质调查局项目(DD20160082,DD20190012)、国家自然基金项目(41574133,41630320)、国家重点研发计划(2016YFC0600201)及中国地质科学院基本科研业务费专项经费(YYWF201526)联合资助。
Crust thickness and its apocalyptic of mineralization in South China: Constraint from Satellite Gravity data
LUO Fan1,2,3, YAN Jiayong2,3, FU Guangming1,2,3, WANG Hao2,3, TAO Xin1,2,3, LUO Lei1,2,3
1.School of Geophysics and Measurement-control Technology, East China University of Technology, Nanchang 330013, Jiangxi, China;2.Chinese Academy of Geological Sciences, Beijing 100037, China;3.China Deep Exploration Center, China Geological Survey & Chinese Academy of Geological Sciences, Beijing 100037, China
Abstract:
Mineral resources in South China are abundant with the distribution of multiple polymetallic metallogenic belts. The formation of polymetallic metallogenic belts was often accompanied by a special deep background and the underground process. Studying the crust-mantle coupling relationship reflected by the crustal thickness based on the Moho depth calculation can provide a reference for exploring the formation and evolution of underground massive metal resources in South China. In this paper, the data of high-order satellite gravity field model EIGEN-6C4 was corrected based on the gravity calculation method of spherical coordinates, and the satellite Bouguer gravity anomaly was obtained in South China. Then the modified Parker-Oldenburg method was used to perform the variable density interface inversion, and the characteristics of the Moho surface in South China were revealed. Finally, based on the ranges of different metallogenic belts in the area and the geological and geochemical data available, the authors investigated the relationship between the source of ore-forming materials and the formation mechanism of Moho surface undulations in different metallogenic belts in the study area. It is estimated that the middle and lower reaches of the Yangtze River and the eastern part of the Qinhang area are located in the metallogenic belt of the Moho surface uplift area. In addition, mantle source materials played a dominant role in its metallogenesis, forming a polymetallic deposit mainly composed of copper and iron. The Nanling, Wuyi, western section of Qinhang and western Hubei-Xiangxi are located in the metallogenic belt of the Moho facetocclusion zone. The ore-forming process was closely linked to the interaction of the shell and mantle source, forming tungsten, tin, gold and silver, lead and zinc and other polymetallic deposits.
Key words:  satellite gravity data  spherical gravity correction  variable density interface inversion  Moho depth  South China