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Ore-control factors and genesis of Huoshiya barite-fluorite deposit in Pengshui,Chongqing,China

ZOU Hao1,XU Zhan-zhang2,ZHANG Shou-ting1, FANG Yi1,GAO Feng1,ZENG Zhao-fa1 1.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences,Beijing 100083,China; 2.Institute of Mineral Resources Exploration and Comprehensive Evaluation, Chengdu University of Technology,Chengdu 610059,China  
This paper selects the Huoshiya barite-fluorite deposit in Pengshui of Chongqing from the barite-fluorite metallogenic belt in the southeast of Sichuan as the object of study and discusses the ore-control factors and the genesis of the deposit.The results show that the stratum and the structure control the formation of the deposit together.The main host rocks of the deposit are Fenxiang Formation and Honghuayuan Formation of Lower Ordovician.There are two groups of structures,that is,the NE trend structure and NW trend structure.The NE trend structure is the structure as passage-way for ore fluid,and the NW trending is the ore-distributing and ore-hosting faults.The ore body occurs in the NW compresso-shear faults.The minerals in the studied are clear.The ore minerals are fluorite and barite,and the gangue mineral is mainly calcite.The ore textures are mainly euhedral,subhedral,anhedral,etc.The ore structures are the shapes of lump,banded,punctate,agglomerate,brecciated,etc.The mineral alteration is weak and calcitization is the main kind.The ore-forming elements such as Ba,S,Ca,F are leached,resolved and extracted by precipitated water and formation water,and then concentrated in the hydrothermal fluids.The structure and the temperature and pressure gradient of strata make the fluids upwelling,but the Dawan Group shale layer with thickness of hundreds of meters,blocks the fluids upwelling and make them stand in the Lower Ordovician limestone and the deep strata,making the BaSO4 and CaF2 crystallized and mineralized in these strata.
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