湖南常宁市鳌头铅锌矿床地质特征及成因探讨
2020-08-06田磊,杜云,邹源
田磊,杜云,邹源



文章编号:1672-5603(2020)02-21-5
摘 要 鳌头铅锌矿床位于塔山岩体西北侧外接触带。已发现的2条矿脉皆产于硅化断层破碎带中,矿脉产状严格受断层产状控制,矿脉的形成与硅化、方解石化等蚀变关系密切。通过分析该矿床的成矿地质背景,并根据矿脉的产出部位、形态特征、围岩蚀变、矿石结构构造、矿物组合等方面的特征,推断该矿床为中温热液充填交代型矿床。
关键词 铅锌矿床;地质特征;成因探讨;鳌头
中图分类号:P618.42 文献标识码:A
Geological Characteristics and Genetic Discussion of Aotou Lead-zinc deposit in Changning, Hunan Province
Tian Lei , Du Yun , Zou Yuan
(Hunan Institute of Geological Survey , Changsha Hunan 410116)
Abstract: Aotou lead-zinc deposit is located in the outer contact zone at the northwest side of Tashan intrusion. The two veins that have been found all occur in silicified fault broken zone,and their occurrence are strictly controlled by the fault. The formation of the veins is closed related with silicification and calcitization. By analyzing the ore-forming geological setting of the deposit, and according to the location, morphology, wall rock alteration, ore texture and structure, mineral composition and other characteristics of the veins, infer the deposit as a mesothermal filling metasomatic deposit.
Keywords: lead-zinc deposit; geological characteristics; genesis of deposit; Aotou
南岭成矿带内花岗岩广泛发育,与之有关的有色金属、稀有金属等矿床十分的丰富[1-4]。湖南境内的阳明山—塔山—大义山东西向构造岩浆带位于南岭成矿带西段北缘,主要岩体有阳明山、塔山、大义山岩体,大义山岩体出露区域内分布众多矿床(点),因此以往的地质找矿工作着重在该区域内开展,取得了重要进展和众多成果[5]。与大义山岩体毗邻的塔山岩体区域内地质工作基础较薄弱,区域内矿床研究程度较低,尚未发现大中型金属矿床。通过开展“湖南上堡地区矿产远景调查”项目,在塔山岩体区域取得了较好的找矿突破,鳌头铅锌矿为本次工作新发现的矿床,笔者通过对鳌头铅锌矿床的地质特征分析,探讨了矿床成因,对今后塔山地区的找矿工作有一定的指示意义。
1 区域地质概况
本区位于华南造山带的北西缘,是湘东南主要的成矿远景区之一[6]。
区域内出露的地层较齐全,除志留系、三叠系缺失外,寒武系至第四系均有出露,其中寒武系、奥陶系、泥盆系及石炭系出露面积较大。……
