多期构造变形事件对吉林南部大横路Cu- Co矿床富集成矿的制约
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本文为国家自然科学基金项目(编号92062214)、国家重点研发计划项目(编号2022YFC2903502)、中国地质调查项目(编号DD22021649)和中国地质科学院基本业务费项目(编号JB2304)联合资助的成果


Constraints of multi- stage tectonic deformational events on enrichment and mineralization of the Dahenglu Cu- Co ore deposit in southern Jilin Province
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    摘要:

    钴矿是重要的战略性金属矿产资源之一,对其成矿作用(如构造与成矿的关系)进行深入的研究能为前期指导找矿提供理论依据。本文对中国东部吉林白山市三道沟镇三岔河村大横路Cu- Co矿开展了相关工作,包括野外构造解析、钻孔- 岩芯资料分析、钻孔薄片综合矿物分析系统(TIMA)实验和区域相关岩石年代学等。构造解析显示大横路Cu- Co矿围岩变形包括层片交切、S1面理和褶劈理等构造要素。钻孔- 岩芯资料分析矿区发育大量F2紧闭褶皱、逆冲断层及断层相关褶皱、倒转褶皱F2等。钻孔、探槽薄片样品TIMA实验显示含Co流体大量富集于低角度逆冲断裂、倒转褶皱韧性剪切域和断层相关褶皱转折端处。这些工作显示走向为NE的低角度逆冲断裂及断层相关褶皱对大横路Cu- Co矿的富集起到关键的控制作用。相关年代学工作,结合前人研究及大量区域地质资料表明:① 矿区内逆冲断层及褶皱等控矿构造要素为古元古代构造事件的产物;② 中生代构造事件对成矿作用的制约(Cu- Co矿的再富集)可能来自于白垩纪大规模的伸展作用。

    Abstract:

    Cobalt ore deposit is one of the significant strategic metal minerals. The in- depth study of its mineralization (such as the relationship between structure and mineralization) can provide the theoretical basis for guiding ore prospecting. Based on the research of Dahenglu Cu- Co mine in Sanchahe Village, Sandaogou Town, Baishan City, Jilin Province, China, the field structural deciphering, drilling and core data analysis, TIMA test of drilled sections and regional rock chronology are mainly carried out. Structural deciphering shows that the country rock of Dahenglu Cu- Co mine includes bedding- cleavage interaction, S1 cleavage, and crenulation cleavage. A large number of F2 closed folds, thrust faults, and their related asymmetric folds, and overturned folds are developed in the Dahenglu Cu- Co mine based on drilling holes and cores analysis. TESCAN Integrated Mineral Analyzer (TIMA) experiments of thin section samples from boreholes and exploratory trenches show that Co- containing fluids are enriched in the low- angle thrust faults, the ductile shear domain of overturned folds, and the hinge zone of fault- related folds. These works show that the NE low- angle thrust fault and fault- related fold play a key role in controlling the enrichment of the Dahenglu Cu- Co deposit. Combined with previous studies, a large number of regional geological data, and the relevant geochronological data show that: ① the ore- controlling structures such as thrust fault and fold in the mine area are the products of the Paleoproterozoic tectonic event. ② The restriction of Mesozoic tectonic events on mineralization (Cu- Co ore re- enrichment) may come from the large- scale extension produced by the Cretaceous tectonic event.

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田忠华,刘福来,刘超辉,朱志勇,王慧宁.2023.多期构造变形事件对吉林南部大横路Cu- Co矿床富集成矿的制约[J].地质学报,97(11):3673-3695.
TIAN Zhonghua, LIU Fulai, LIU Chaohui, ZHU Zhiyong, WANG Huining.2023. Constraints of multi- stage tectonic deformational events on enrichment and mineralization of the Dahenglu Cu- Co ore deposit in southern Jilin Province[J]. Acta Geologica Sinica,97(11):3673-3695.

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  • 收稿日期:2023-03-18
  • 最后修改日期:2023-06-07
  • 录用日期:2023-06-07
  • 在线发布日期: 2023-12-13