黄金科学技术 ›› 2023, Vol. 31 ›› Issue (4): 531-545.doi: 10.11872/j.issn.1005-2518.2023.04.118
• 矿产勘查与资源评价 • 下一篇
Juntao NING(),Baoliang HUANG(),Guojun DONG,Yueqiang ZHOU,Zhuolong GAO,Bo KANG
摘要:
湘东北地区热液型钴多金属矿床赋存于长沙—平江断裂带下盘的构造热液蚀变岩带内,目前对带内钴的赋存形式及含钴矿物的认识并不充分,因此制约了对该带钴成矿机制的理解。详细的矿相学观察、TIMA和电子探针分析结果表明:黄铁矿是横洞矿区重要的含钴矿物,具有复杂的结构特征,表现为富钴黄铁矿呈环带状或不规则状交代核部贫钴黄铁矿,富钴黄铁矿Co含量高达3.52%,Ni含量低于0.09%,富钴黄铁矿的形成与流体耦合的溶解再沉淀机制有关。辉砷钴矿是金塘钴多金属矿区最主要的载钴矿物,呈他形粒状产出或被包裹在毒砂内,颗粒大小为3~45 μm,Co含量为9.51%~23.21%,Ni含量为5.52%~15.24%。结合井冲矿区已有工作,提出在连云山地区从控矿断裂带南西到北东方向,含钴矿物存在由辉砷钴矿向黄铁矿转变,且辉砷钴矿中Co含量升高、Ni含量降低,而黄铁矿中Co含量降低,这一变化趋势可能与成矿流体的运移方向和物理化学条件(如pH值和硫逸度等)有关。结合湘东北地区钴(多金属)矿床(点)严格受长沙—平江断裂带控矿,提出连云山地区深大断裂的南西侧可作为今后湘东北钴矿勘查的重点方向。
中图分类号:
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