Geology and genesis of the Dahuangshan REE-Nb-Fe polymetallic mineralization zone in Karakoram Range

The study on geology and genesis of the rare earth niobium iron titanium polymetallic mineralization zone in Dahuangshan, Kunlun Mountain, Kara can provide the basis for the exploration work in this area.Based on detailed field geological survey and summarizing of the geological characteristics of the Dahuangshan RE-Nb-Fe-Ti deposit, together with microscopic identification and geochemical analysis, the genetic types and mineralization of the iron ore are discussed.The analysis of structural deformation after metallogenic period can lead to the prediction of orebody location and prospecting target generation.The depositional environment of the ore-bearing formation in the Dahuangshan REE-Nb-Fe-Ti mineralization belt is littoral-shallow sea carbonate platform facies.The mineralization zone is located in the upper part (limestone Formation) of the Pasi Group (ore-bearing argillaceous limestone), and extends over 30 km in the area, two mineralized bodies (Ⅰ-1, Ⅰ-1) were found in the west section, and seven mineralized bodies (Ⅱ-1~Ⅱ-7) were found in the east section, Single mineralized bodies are generally 170-2000 m long and 10-32 m thick.whose attitude is consistent with strata.The ore assaying show that the mineralized bodies contain RE-Nb-Fe-Ti and other metallogenic elements.The genetic type of the deposit is offshore marine sedimentary type.The ore source is lateritic weathering crust in ancient continental area.It is presumed that the original rock is rapidly transported by mixing fluid of sediment gravity flow and colloidal solution, and rapidly unloaded and accumulated by event sedimentation in coastal zone.After the metallogenic period, the ore-bearing formation underwent intense structural transformation.The mineralized layer and the ore-bearing formation were deformed synchronously with various ore-controlling structures.The eastern part of the ore-bearing formation is characterized by a compound-superimposed fold structure, while the western part is characterized by a compression fault block-steeply dipping monoclinic structure.This area shows great prospecting potential.Through further mineral geological work, it is expected to achieve important prospecting breakthroughs for Fe, Al and Ti, especially rare and rare earth elements.After the metallogenic period, the ore-bearing structure underwent a strong structural transformation, and formed a fault-fold belt with NWW direction on the whole.The compound-superimposed inverted "S" fold structure developed in the belt constituted the most characteristic ore-controlling structural style in the area. This area shows great prospecting potential.Through further mineral geological work, it is expected to achieve important prospecting breakthroughs for Fe, Al and Ti, especially rare and rare earth elements.