Analysis On Ore-controlling Factors Of Baimadong Uranium Deposit In Guizhou

Guizhou Baimadong uranium polymetallic deposit(504)is one of the typical carbon-silica mudstone-type uranium deposits in China.Guizhou Province is located in the south of the ?Central Guizhou Uplift? of the ?Yangtze Plate and the North of Guizhou Tailong?,and is located on the southwestern margin of the Yangtze Plate.The predecessors have conducted in-depth research on the ore-forming geological background and genesis of the deposit,but the research on ore-controlling factors is relatively weak.In-depth study of ore-controlling conditions is of great significance for the deepening of the genesis of the deposit and the subsequent prospecting work.Based on the field geological survey,this paper mainly studies the geological structure characteristics and ore-controlling rules of the deposit through the comprehensive study of borehole,tunnel data,geophysical structure interpretation and element geochemical analysis results.The spatial distribution of the main ore-controlling structures,the coupling relationship between the deep and shallow structures and the control of the uranium deposits are discussed.The ore-controlling factors of the Baimadong uranium deposit are mainly: black rock series,fault structure,Hydrothermal cryptoexplosive breccia and black alteration.Get the following results:(1)The Cambrian Niutitang Formation and the Qingxudong Formation black rock series in the Baimadong mining area belong to the ?uranium source layer? and provide space for the enrichment of ore-forming elements and control the ore-bearing horizon.(2)In the region,the Baimadong fault is located in the west of the Nayong-Guiyang deep fault,which is a good channel for the migration of ore-bearing hydrothermal fluids,and controls the distribution of mineralization zones in the region.Due to the multi-stage tectonic movement,the slip system and the fracture zone between the secondary folds provide enrichment space for the ore-bearing hydrothermal fluid,which controls the distribution of regional mineralization points to some extent.The multi-level of the Baimadong fault on the plate The slip-off structural part and the secondary-transversal end of the fold across the fold form an inter-layer structure system,which is a favorable part of the ore-bearing hydrothermal migration and rich integration.The Baimadong fault and the rhinoceros cave fault controlled the distribution of the ore body of the Baimadong deposit to a certain extent,forming its north-south boundary.(3)The formation of hydrothermal cryptoexplosive breccia provides both heat and source for the ore body and space for the occurrence of the ore body.The hydrothermal cryptoexplosive breccia body is an important prospecting indicator in the mining area;(4)In space,the breccia belt,ore body and black alteration are related to each other.Black alteration is closely related to the ore body,especially the black altered silicified rock developed on both sides of the fault controls the ore body.Distribution.(5)It is easy to form an inter-layer fracture zone between the Dolomites of the Upper Sinian Dengying Formation and its upper hoofed pond group and the fine clastic group of the lower Doushantuo Formation,and there is the possibility of rich ore bodies.An important object of the ore-forming space.The uranium,mercury,molybdenum and polymetallic elements in the region are enriched in the southeast,so it is possible to consider finding hidden ore bodies in the southern part of the mine.