Study on mineralization characteristics and alteration mineralization mechanism and ore-controlling structure at Jiling uranium deposit in Longshoushan of Gansu
Jiling uranium deposit is one of the typical deposits in Longshoushan area,Gansu Province.Con-ducting in-depth research on this deposit is beneficial to guide the prospecting work in other areas within the region.This paper has combined the previous exploration data in the past years and research achievement to summarize the uranium mineralization characteristics of Jiling deposit systematically.Based on this,the geo-chemistry of rock and ore zone and the ore-controlling structures is analyzed to explore for the alteration min-eralization mechanism and structural ore-controlling mechanism.The study result indicates that Jiling depos-it is located near the contact zone controlled by Malugou fault.From the rock mass to ore body,there is a zonation phenomenon of porphyritic granite-non-mineralized sodium metasomatic rock-anomalous sodium metasomatic rock-mineralized sodium metasomatic rock-ore-bearing sodium metasomatic rock.The ore de-velopment is mainly characterized by sodium feldspathization,hematitization,carbonatization and chloritiza-tion.The mineralization process is experienced for two stages of hydrothermal alteration,namely,early-stage of magmatic hydrothermal autometasomatism and late-stage superimposed external circulating fluid mineralization enrichment alteration,with the typical alteration feature sodium of feldspathization and hema-titization.In terms of spatial distribution,the ore bodies are controlled by Malugou fault and its secondary faults.Due to the complexity of Malugou fault,through the investigation of extensive deep drilling holes,it is currently considered that Malugou fault can be roughly divided into two parallel faults,F101 and F105,in-fluenced by the residual body of Paleoproterozoic Baijiazui Formation marble.These two faults converge into a steeply dipping fault at the apex of the deep residual body.Comprehensive analysis suggests that the sec-ondary faults of Malugou fault are ore-controlling structures.The area between the main and secondary fault structures is the most favorable zone for uranium mineralization and it will also be the important prospecting area for the exploration work in the future.
Jiling uranium depositnatrium metasomatismmalugou faultLongshoushan area
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