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1. 贵州省地质矿产勘查开发局106地质大队
2. 中国地质大学(武汉)地球科学学院
3. 中国地质大学(武汉)资源学院
4. 贵州大学资源与环境工程学院
5. 贵州大学喀斯特地质资源与环境教育部重点实验室
Published:2025
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李源洪, 杜红毅, 陈军, et al. 贵州余庆地区层间破碎带热液型重晶石矿床地球化学特征与成因分析[J]. Bulletin of Geological Science and Technology, 2025, 44(3): 122-133.
李源洪, 杜红毅, 陈军, et al. 贵州余庆地区层间破碎带热液型重晶石矿床地球化学特征与成因分析[J]. Bulletin of Geological Science and Technology, 2025, 44(3): 122-133. DOI: 10.19509/j.cnki.dzkq.tb20240350.
热液型重晶石因其高品质而成为近些年的重点勘查对象。位于扬子克拉通中部的武陵-苗岭一带是我国主要的热液重晶石成矿区,已成为重要钡资源基地。近些年,在贵州黔北新发现了受上寒武统娄山关群白云岩与下奥陶统桐梓组底部页岩接触部位控制的重晶石矿体,矿体延伸稳定,具有较大的成矿潜力,但其特殊热液成矿机制尚未开展系统研究,制约了进一步的勘查部署工作。以贵州余庆地区热液型重晶石为研究对象,开展了系统的岩相学、主微量元素地球化学和硫同位素组成分析研究。野外地质调查表明,硅(碎屑岩)-钙(白云岩)界面产生的层间破碎带及张性裂隙是该区重晶石的主要控矿构造。元素地球化学分析表明,围岩白云岩样品δCe呈现无异常特征(平均1.06),而重晶石样品呈明显的δCe负异常(平均0.66),揭示重晶石在氧化条件下形成。(Cu+Zn)与Sr元素协变关系和Y/Ho比值指示成矿物质可能来自寒武系富Ba的碳酸盐岩(含膏岩)地层。同样重晶石硫同位素组成(δ
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SVCDT为30.94‰~41.27‰)也指示硫主要来自寒武系海相蒸发岩。综合前人研究认为,构造运动驱使盆地流体发生运移,并萃取富Ba蒸发岩地层,在层间断层(硅-钙界面)与大气降水混合,形成重晶石矿床。研究成果为重晶石矿床的勘查提供重要参考。
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