前寒武纪VMS与BIF铁矿床共生组合研究进展
发布时间：2018-08-31 15:51
【摘要】：VMS和BIF铁矿作为两种重要的矿床类型,在前寒武纪常常以共生组合方式赋存于古老克拉通内的表壳岩系中,是早期地球构造和环境演化耦合作用的产物。该组合不仅记录了当时特定的构造及大气和海洋环境,而且两者也是全球铜、铁、铅、锌等金属的重要来源,因此,开展VMS与BIF共生组合的研究具有重大科学价值和经济意义。前人研究表明,前寒武纪VMS与BIF集中出现于~2.7 Ga和~1.9 Ga,与同时期地幔柱活动和地壳增生的高峰相对应,两者共生时BIF通常产出于VMS外围或上盘,但在矿体空间展布上具有此消彼长的关系;研究还认为,前寒武纪地幔柱活动诱发的海底扩张、海底和地表强烈的火山活动形成的多重热液系统,可同时为VMS和BIF提供物质来源,海水的硫逸度、氧逸度及大气的氧含量是影响VMS与BIF空间分布及VMS硫同位素组成的重要因素。目前,VMS与BIF共生组合研究取得了较大进展,但仍存在一些问题:缺乏典型共生实例的精细解剖,已有共生模型缺乏详细的矿床成因机制研究支撑,对两者共生组合产出的构造背景和古海洋环境仍存在不同认识。华北克拉通的清原和五台新太古代绿岩带发育有较大规模的VMS与BIF铁矿共生现象,对其开展详细研究工作将为解决上述问题提供借鉴。
[Abstract]:As two important ore deposit types, VMS and BIF iron ore deposits occurred in a symbiotic assemblage in the Precambrian in the ancient cratonic crust rock series, which is the product of the coupling of early tectonic and environmental evolution. The combination not only recorded the specific tectonic and atmospheric and marine environments at that time, but also was an important source of copper, iron, lead, zinc and other metals in the world. Therefore, it is of great scientific value and economic significance to study the symbiotic association of VMS and BIF. Previous studies have shown that the Precambrian VMS and BIF concentrations occurred in the Precambrian region of 2.7 Ga and 1. 9 Ga, corresponding to the peak of mantle plume activity and crustal accretion in the same period, and that BIF usually occurred in the outer or upper disk of VMS when they were symbiotic. However, the spatial distribution of the orebodies is related to each other, and it is also believed that the Precambrian mantle plume induced undersea expansion, the strong volcanic activity on the sea floor and the surface of the earth formed multiple hydrothermal systems, The sulfur fugacity, oxygen fugacity and atmospheric oxygen content of seawater are important factors affecting the spatial distribution of VMS and BIF and the composition of VMS sulfur isotope. At present, great progress has been made in the study of BIF symbiotic assemblage, but there are still some problems, such as the lack of fine anatomy of typical symbiotic examples, and the lack of detailed research support on the genetic mechanism of ore deposits in the existing symbiotic models. The tectonic background and paleo-marine environment of the symbiotic assemblage are still different. In the Qingyuan and Wutai NeoArchean greenstone belts of North China Craton there is a large scale symbiosis between VMS and BIF iron ore. The detailed research work will provide reference for solving the above problems.
【作者单位】： 中国科学院矿产资源研究重点实验室中国科学院地质与地球物理研究所;中国科学院大学地球科学学院;中国有色集团抚顺红透山矿业有限公司;中国地质大学地球科学与资源学院;
【基金】：国家自然科学基金项目“晚太古代清原绿岩带BIF与VMS矿床的成因联系及沉积环境”(批准号:41572076) “973”项目“华北克拉通前寒武纪重大地质事件与成矿”(批准号:2012CB416601)联合资助
【分类号】：P618.31
[Abstract]:As two important ore deposit types, VMS and BIF iron ore deposits occurred in a symbiotic assemblage in the Precambrian in the ancient cratonic crust rock series, which is the product of the coupling of early tectonic and environmental evolution. The combination not only recorded the specific tectonic and atmospheric and marine environments at that time, but also was an important source of copper, iron, lead, zinc and other metals in the world. Therefore, it is of great scientific value and economic significance to study the symbiotic association of VMS and BIF. Previous studies have shown that the Precambrian VMS and BIF concentrations occurred in the Precambrian region of 2.7 Ga and 1. 9 Ga, corresponding to the peak of mantle plume activity and crustal accretion in the same period, and that BIF usually occurred in the outer or upper disk of VMS when they were symbiotic. However, the spatial distribution of the orebodies is related to each other, and it is also believed that the Precambrian mantle plume induced undersea expansion, the strong volcanic activity on the sea floor and the surface of the earth formed multiple hydrothermal systems, The sulfur fugacity, oxygen fugacity and atmospheric oxygen content of seawater are important factors affecting the spatial distribution of VMS and BIF and the composition of VMS sulfur isotope. At present, great progress has been made in the study of BIF symbiotic assemblage, but there are still some problems, such as the lack of fine anatomy of typical symbiotic examples, and the lack of detailed research support on the genetic mechanism of ore deposits in the existing symbiotic models. The tectonic background and paleo-marine environment of the symbiotic assemblage are still different. In the Qingyuan and Wutai NeoArchean greenstone belts of North China Craton there is a large scale symbiosis between VMS and BIF iron ore. The detailed research work will provide reference for solving the above problems.
【作者单位】： 中国科学院矿产资源研究重点实验室中国科学院地质与地球物理研究所;中国科学院大学地球科学学院;中国有色集团抚顺红透山矿业有限公司;中国地质大学地球科学与资源学院;
【基金】：国家自然科学基金项目“晚太古代清原绿岩带BIF与VMS矿床的成因联系及沉积环境”(批准号:41572076) “973”项目“华北克拉通前寒武纪重大地质事件与成矿”(批准号:2012CB416601)联合资助
【分类号】：P618.31
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