黄金科学技术 ›› 2024, Vol. 32 ›› Issue (6): 1002-1015.doi: 10.11872/j.issn.1005-2518.2024.06.041
• 矿产勘查与资源评价 •
Xiaogang WANG1(), Feng YU1, Fei JIA1, Songbai LIU2, Yongyong SHAO1
摘要:
李洞沟金矿是近年来在陕西汉中碑坝地区基底盖层中发现的首个内生金矿床,已圈出金矿体20余条,矿体长度为70~1 400 m,平均厚度为0.31~9.80 m,金品位为0.83×10-6~21.21×10-6,已达中型规模。通过开展野外地质调查工作,系统梳理了矿体地质特征,结合矿石镜下鉴定,对李洞沟金矿的矿石类型、矿物组合、成矿期次和成矿阶段进行了细致研究,总结了该矿床的控矿条件和成矿规律。研究结果表明:李洞沟金矿床的矿体主要受NNE向断裂控制,矿石类型以角砾岩型和石英脉型为主,属于构造蚀变岩型+石英脉型金矿床;该金矿经历了赋矿层位形成、早期金矿形成、富集成矿和表生风化剥蚀4个成矿阶段;基于研究结果,提出了新的找矿思路,即浅部在石英绢云母片岩内寻找石英脉型金矿体,中—深部寻找由大理岩层间破碎带控制的角砾岩型和石英脉型金矿体。上述认识能够为矿区探边扩量提供必要的勘查依据,也为区域寻找同类型金矿提供有益参考。
中图分类号:
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