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湘西北地区青竹界重晶石矿地质特征及成因探讨

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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(BaSO4)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.
Geological characteristics and genesis of the Qingzhujie barite deposit in northwest Hunan
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 sur-rounding rock,exhibiting synchronous folding.The mineral assemblage is simple,and the ore grade is rich,with w(BaSO4)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 hydro-thermal exhalative sedimentary deposits,it is determined that the genetic type of the deposit is a hydrother-mal exhalative sedimentary barite deposit.

barite depositgeological characteristicsgenesis of the depositLongmaxi Formationnorthwest-ern Hunan

凌跃新、曾广乾、李泽泓、梁恩云

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湖南省地质调查所,湖南长沙 410116

重晶石矿 地质特征 矿床成因 龙马溪组 湘西北

2024

矿产与地质
桂林矿产地质研究院

矿产与地质

CSTPCD
影响因子:0.42
ISSN:1001-5663
年,卷(期):2024.38(6)