| 高卓龙,宁钧陶,刘文浩,孙华山,康博.湘东北矿集区井冲铜钴矿床关键控矿因素研究[J].矿产勘查,2026,17(1):95-110 |
| 湘东北矿集区井冲铜钴矿床关键控矿因素研究 |
| Research on key controlling factors of Jingchong copper-cobalt deposit in Northeast Hunan Province, China |
| 投稿时间：2025-03-18 |
| DOI：10.20008/j.kckc.202601008 |
| 中文关键词: 铜钴矿 控矿因素 井冲 湘东北 |
| 英文关键词: copper-cobalt ore deposit ore-controlling factors Jingchong northeast Hunan Province |
| 基金项目:本文受湖南省浏阳市鑫磊矿业开发有限公司委托项目“浏阳井冲铜钴矿床三维地质建模及找矿预测”资助。 |
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| 摘要点击次数: 216 |
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| 中文摘要: |
| 井冲铜钴矿床是湘东北矿集区的一个典型热液脉型铜钴多金属矿床，目前对其关键控矿因素仍存在较大争议。本文基于构造-地球化学剖面测量和容矿断裂下盘花岗质糜棱岩的锆石 U-Pb定年及 Hf同位素测试，深入探讨岩浆岩和断裂构造的控矿贡献。结果显示，井冲铜钴矿床成矿时间晚于连云山花岗岩体的就位，且连云山岩体为 S型花岗岩，岩浆为中等氧化-还原性状态，不具备成铜钴矿床的能力，因此连云山花岗岩体不是该矿床的关键控矿因素。经过矿区的长平断裂带是一个多期活动的大型断裂带，其早白垩世张性活动时间与井冲矿床的成矿时间一致，且铜钴矿体产出受长平断裂张性活动派生的次级共轭裂隙控制，因此长平断裂带是井冲铜钴矿床的关键控矿因素。上述结果表明，井冲铜钴矿床是一个受长平断裂带控制的热液脉型矿床，成矿与连云山花岗岩体无成因联系，成矿物质可能来自连云山岩群结晶基底，下一步找矿工作需要更加关注断裂带内的反倾裂隙。 |
| 英文摘要: |
| The Jingchong copper-cobalt deposit represents a typical hydrothermal vein-type polymetallic de-posit within the mineralization concentration area of northeast Hunan Province, China. The identification of key ore-controlling factors remains contentious. This study conducts detailed geological investigations and zircon U-Pb dat-ing and Hf isotope analysis of granitic mylonite from the footwall of the ore-bearing fault. Based on these analyses,this paper identifies the contributions of magmatic rocks and fault structures to mineralization. The results suggest that the mineralization of the Jingchong copper-cobalt deposit postdates the emplacement of the Lianyunshan gran-ite massif. Furthermore, the Lianyunshan granite massif is classified as an S-type granite, with its magma exhibitinga moderately oxidizing-reducing state, which lacks the potential to form copper-cobalt deposits. Consequently, theLianyunshan granite massif is not a critical ore-controlling factor for this deposit. Conversely, the Changping faultzone, which traverses the mining area, is identified as a large, multi-phase active fault zone. Its Early Cretaceous ex-tensional activity period aligns with the mineralization age of the Jingchong deposit. The ore-hosting fractures aresecondary conjugate fractures derived from the extensional activity phase of the Changping fault. Therefore, theChangping fault zone is the critical factor controlling the Jingchong Cu-Co deposit. These findings demonstrate thatthe Jingchong Cu-Co deposit is a hydrothermal vein-type deposit controlled by the Changping fault zone. The min-eralization process shows no genetic relationship with the Lianyunshan granite massif. Instead, the ore-forming ma-terials may originate from the crystalline basement of the Lianyunshan Group. The next exploration work should paymore attention to the anti-dip fissure in the fault zone. |
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