豫西南地区铜矿成因类型及成矿规律

    Genetic types and ore-forming laws of copper deposits in southwestern Henan Province

    • 摘要: 豫西南地区是河南省重要的多金属成矿区,为进一步在该区实现铜矿找矿突破,在收集豫西南地区典型铜矿地质资料并对典型矿床及矿点开展详细地质调查的基础上,通过对比成矿物质来源、成矿流体等特征,探讨研究区铜矿的成因类型,总结豫西南地区铜矿的成矿规律。研究表明豫西南地区包含3种铜矿成因类型: ①块状硫化物型,其矿体主要产于二郎坪群细碧-石英角斑岩系,并受NWW向压扭性断裂、韧性剪切变质带及次级断裂带控制; ②斑岩-矽卡岩型,其矿体主要产于秦岭群雁岭沟组大理岩、斜长角闪片麻岩、花岗片麻岩中,次级断裂带是控矿和储矿的有利部位,燕山期花岗岩、花岗斑岩及其附近也是矿化有利部位; ③中低温热液充填型,其矿体沿构造破碎带展布,产状与构造蚀变带一致。豫西南地区铜矿的成矿时间主要集中于加里东期和燕山期,以燕山期为主。结合构造和岩体控矿规律,划分出4处成矿有利区。研究成果可为豫西南地区铜矿找矿提供参考。

       

      Abstract: The southwestern Henan Province is an important polymetallic mineralization area. To further achieve breakthrough in copper ore exploration in this region, the authors conducted the study based on the typical copper deposits data in the southwestern Henan Province, and the exploration work at typical deposits and mineral occurrences. The mineral sources and ore-forming fluids were compared in this research to explore the different genesis types of the copper deposits in this area and summarize the mineralization laws of the copper deposits in the southwestern Henan Province. The research indicated that copper deposits in the southwestern Henan Province contained three different genetic types. The first one is blocky sulfide type, whose ore bodies are mainly produced in the diabase quartz porphyry series of Erlangping Group, and are controlled by the NWW-trending compressive-torsional fault, ductile shear metamorphic zone and secondary fault zones. The second one is porphyry-skarn type, whose ore bodies are mainly produced in Qinling Group Yanlinggou Formation marble, plagioclase amphibolite gneiss, granite gneiss. The secondary fault zone is a favorable location for ore control and storage, while Yanshanian granite and granite porphyry veins and their surrounding areas are favorable locations for mineralization. The third one is medium low temperature hydrothermal filling type, whose ore bodies are all controlled by structures, and its occurrence is consistent with the tectonic fracture zone. The mineralization time of copper deposits in the southwestern Henan Province is concentrated in Caledonian period and Yanshanian period, with Yanshanina period being the main one. Finally, based on the structure and the ore-controlling patterns of the rock mass, four favorable areas for mineralization were identified. This research could provide references for copper prospecting in the southwestern Henan Province.

       

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