湘西北下光荣矿区铅锌矿床主要地球化学特征  

Main geochemical characteristics of lead-zinc deposits in Xiaguangrong ore district,northwestern Hunan

作　　者：匡文龙[1] 刘新华[1] 陈年生[2] 余沛然[2] 陈新跃[1] 

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南省地质矿产勘查开发局405队,湖南占首416007

出　　处：《地质科学》2008年第4期685-694,共10页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：湖南省自然科学基金资助项目(编号:06JJ50075);中国地质调查局项目(编号:200110200022)的部分成果

摘　　要：湘西北洛塔矿田下光荣矿区中的铅锌矿床主要赋存于下奥陶统的南津关组、分乡组及红花园组中,层控特征明显。矿床地球化学特征分析表明矿质主要来自造山带,硫质主要来源于同沉积的海水硫酸盐。大气降水等组成的含矿热卤水在地下流动的过程中,不断萃取地层中的金属成份,并在温度降低的同时,沉淀富集金属物质成份,有用组份主要以氯的络合物方式进行搬运,主成矿期的成矿温度为108～197℃,矿床成因类型属层控型低温热液矿床。加里东期和燕山期的改造则决定了矿床的现今分布格局和矿体的赋存状态及产状。The lead-zinc deposits in Xiaguangrong ore district of Luota Ore Field, northwestern Hunan, occurred in the Nanjinguan, Fengxiang and Honghuayuan Formations in age of Early Ordovician, with an obvious feature of stratabound ore deposit. Based on field survey and measurements of Pb, O and S isotopes, the ore-bearing formation and later reformation were discussd in the paper. The geochemical characteristics of the lead-zinc deposits revealed that the metal originated from intracontinent collision orogen, and the sulphide substance sourced from syndeposited seawater sulphates mainly. The mineralization was formed by the circulation of hot brine, which came from meteoric water and absorded the metal substance from the surrounding strata in its flowing process. The main mineralization constituent was transited in a form of chlorine complex, and the temperature in main mineralization period was 108 -197 ℃. The genetic type of the lead-zinc deposit was strata-bound ore deposit with low temperature and hot fluid in this area. The reformation in the Caledonian and Yanshanian played an important role in distributional framework of ore deposits and the shapes and occurrences of ore bodies.

关 键 词：矿床地球化学 层控铅锌矿床 后期改造 下光荣矿区 湘西北 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]