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