湘西北地区青竹界重晶石矿地质特征及成因探讨  

Geological characteristics and genesis of the Qingzhujie barite deposit in northwest Hunan

作　　者：凌跃新 曾广乾 李泽泓 梁恩云 LING Yuexin;ZENG Guangqian;LI Zehong;LIANG Enyun(Geological Survey Institute of Hunan Province,Changsha 410014,Hunan,China)

机构地区：[1]湖南省地质调查所,湖南长沙410116

出　　处：《矿产与地质》2024年第6期1038-1048,共11页Mineral Resources and Geology

基　　金：中国地质调查局地质调查项目(No.12120115028901,No.12120114066201)。

摘　　要：湘西北地区青竹界重晶石矿位于扬子板块东南缘之湘北断褶带上,湘西—鄂西钨锑金―铅锌铜―铁锰多金属成矿带中段内。本文在已有的地质资料的基础上,分析该矿床的成矿地质条件和稀有元素和微量元素地球化学特征,探讨矿床成因。结果表明:该矿床矿体(层)赋存于奥陶志留系龙马溪组微―薄层状碳质硅质岩中,呈透镜状、结核状产出,产状与围岩一致,具同步褶皱。矿物组合简单,矿石品位富,w(BaSO_(4))可达76.08%。根据与典型热液喷流沉积型矿床在矿体产出部位、形态特征、矿物成分、结构构造以及元素地球化学等方面的特征对比,判断其矿床成因类型为热液喷流沉积型重晶石矿床。The Qingzhujie barite mine in the northwestern Hunan region is located on the Xiangbei fault-fold belt at the southeastern edge of theYangtze Plate,within the central section of the Xiangxi-Hubei tungsten-antimony-gold-lead-zinc-copper-iron-manganese polymetallic mineralization belt.Based on existing geological data,this paper analyzes the ore-forming geological conditions and the geochemical characteristics of rare and trace elements of the deposit,and discusses its genesis.The results show that the ore body(layer) is hosted in the Ordovician-Silurian Longmaxi Formation,which consists of micro-thin layers of carbonaceous siliceous rocks.The ore body appears as lenticular and nodular forms,with an occurrence consistent with the surrounding rock,exhibiting synchronous folding.The mineral assemblage is simple,and the ore grade is rich,with w(BaSO_(4)) reaching up to 76.08%.By comparing the location,morphological characteristics,mineral composition,structural features,and elemental geochemistry of the ore body with those of typical hydrothermal exhalative sedimentary deposits,it is determined that the genetic type of the deposit is a hydrothermal exhalative sedimentary barite deposit.

关 键 词：重晶石矿 地质特征 矿床成因 龙马溪组 湘西北 

分 类 号：P619.251[天文地球—矿床学]