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地质力学学报:2021,27(4):497-528
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华南重要成矿区带中生代构造变形及其控岩控矿机理
(1.中国地质大学(北京)地球科学与资源学院, 北京 100083;2.中国地质科学院矿产资源研究所, 北京 100037;3.中国地质科学院地质力学研究所, 北京 100081)
Mesozoic tectonic deformation and its rock/ore-control mechanism in the important metallogenic belts in South China
(1.School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;2.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;3.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China)
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投稿时间:2021-04-09    修订日期:2021-06-05
中文摘要: 华南大陆中生代以来受华北板块、西南缘特提斯洋以及东部古太平洋板块会聚作用形成了多序次的构造变形及多期岩浆与成矿事件,并造就了多个重要的多金属成矿区带。文章在梳理成矿区带典型矽卡岩型矿床矿化期次、矿体分布及成矿机理等关键科学问题的基础上,利用构造变形序次及其控岩控矿的规律性完善了典型矿床成矿过程及成因机理。通过对闽西南铁多金属成矿带、赣东北塔前-赋春钨铜多金属成矿带以及滇东南老君山钨锡矿集区开展构造变形解析,结合已有研究成果,厘定出相对完整的印支期、中晚侏罗世及白垩纪3期变形序列,但其作用时限、构造性质、规模强度及变形样式却表现不一。通过构造控岩分析并结合已有同位素年代学得出,不同成矿区带都存在与变形序列相一致的岩浆或变质热事件,进而利用变形序列与岩浆期次对应规律明确了与马坑式铁多金属矿床、朱溪钨铜矿床以及南秧田钨矿床相关的多期岩浆活动。在此基础上识别出多阶段矿化事件并提出3个典型矿床都存在多期叠加复合成矿的认识。从构造对矿床就位机制控制的角度分析了马坑式矿床分散多变矿体、朱溪矿床垂向大跨度矿化及深部巨型矿体、南秧田矿床层-脉叠加矿体分别受赋矿地层褶皱拆离、大规模双重逆冲以及2期构造变形复合控制的机理。文章最后探讨了不同阶段华南重要成矿区带构造变形及岩浆成矿的动力学背景。
Abstract:Since the Mesozoic, the convergence of the Tethys ocean plate and the Paleo-Pacific plate on the South China block has resulted in the multi-sequence tectonic deformation as well as the multi-stage magmatic and metallogenic events, and has formed many important polymetallic metallogenic belts in South China. In this context, mineralization stages, distribution of ore bodies and metallogenic mechanisms of typical skarn deposits in metallogenic areas were sorted out. And then the mineralization processes and genetic mechanisms of typical deposits are completed using the sequence of tectonic deformation and its rock/ore-control regularity. A structural deformation analysis was made on the southwestern Fe polymetallic metallogenic belt, the northeastern Jiangxi Taqian-fuchun W-Cu metallogenic belt and the Laojunshan W-Sn ore concentration area to set up three relatively complete periods of deformation sequence during the Indosinian period, the middle-late Jurassic and the Cretaceous, combined with previous research results; however, the three deformation sequences differ in duration of tectonics, structural property, scale and strength, and deformation style. The analysis of rock-control by tectonics together with the existing isotope chronology data both revealed that the magmatic or metamorphic thermal events were consistent with the deformation sequence occurred in each mineralization zone, and then the multi-stage magmatic events related to the Makeng-type Fe polymetallic deposit, the Zhuxi W-Cu deposit and the Nanyangtian W deposit were clarified using the corresponding laws between deformation sequence and magmatic stage. On this basis, we identified the multi-stage mineralization events and supposed that multi-stage superposition occurred in the mineralization process of all three typical deposits. From the point of view of structural control over the emplacement mechanism of the ore deposit, this paper analyzed the mechanism of the decentralized polymorphic orebody of the Makeng-type deposit, the vertical large-span mineralization and deep giant orebody of the Zhuxi deposit, and the stratiform-vein superposition orebody of the Nanyangtian deposit, which are controlled by the folding detachment of the ore-bearing strata, the large-scale thrust duplex and the two-stage tectonic compounding respectively. The dynamic background of tectonic deformation and magmatic mineralization in the important metallogenic belts of South China at different stages were discussed.
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基金项目:国家自然科学基金项目(41772069);国家重点研发计划项目(2016YFC0600509);中国地质调查局地质调查项目(12120113089600,12120114028701,1212011085472)
引用文本:
张达,李芳,贺晓龙,等,2021.华南重要成矿区带中生代构造变形及其控岩控矿机理[J].地质力学学报,27(4):497-528.DOI:10.12090/j.issn.1006-6616.2021.27.04.045
ZHANG Da,LI Fang,HE Xiaolong,et al,2021.Mesozoic tectonic deformation and its rock/ore-control mechanism in the important metallogenic belts in South China[J].Journal of Geomechanics,27(4):497-528.DOI:10.12090/j.issn.1006-6616.2021.27.04.045

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