The Organism-organic Matter-fluid Metallogenetic Study On Shihongtan Uranium Deposit In Turpan-Hami Basin Xinjiang

This research project is scientific research project in uranium geology production which was approved to carry out by China nuclear industry geology bureau.On the basis of geological investigation in the field, sampling, samply analysising, simulated test , data processing, inductive and synthesize, the report analysed in a systematic way epigenetic alteration geochemical , isotope geochemical, hydrogeochemical, organic geochemical, organism geochemical characteristic of ore-locating hosting rock in the Shihongtan uranium deposit in Turpan-Hami basin. The author thinks that ore-locating hosting rock originated from southern Jueluotage mountain, the precursor type is mainly granite. the rock in different geochemical belt is same in provenance and tectonic environment. The rock was formed in edge of passive continent, and is product of law-temperature diagenesis action. Organic matter and organism participated in early diagenesis action and epidiagenetic metallogenesis. In weak compression tectonic environment of southwest Turpan-Hami basin, the geochemical horizontal zonation was formed in the ore-locating hosting rock by organism-organic matter-fluid mutual action. The zonation is divided into completely-oxidized, incompletely-oxidized, redox and primary zone in proper order. The zonation was expressed in regularity variation of rock texture and structure, colour, altered mineral, major elements, Ree, U, Th/U, U/Ra, S, organic matter, microbial species and quantity. The nature and source of groundwater in ore-bearing aquifer is analysed by means of major ion composition , Ree andδ¹³OδD, author think that present metallogenetic fluid is exogene origin , and origined from bed rock crevice-water of Jueluotage mountain. When groundwater runoffs in aquifer , the sulphate reduction reaction took place and strong reduced gas H₂S, CH₄, H₂ were formed by way of organism and organic matter mutual interaction. Through study on vitrin reflection power, H/C, O/C, carbon isotope of kerogen, the author think that organic matter mother-material type is sapropelic humus. organic matter is under attritus and bright brown coal stage. Hydrocarbon-generation model is biochemical gas-generation stage. Uranium content in rock is positive correlativity with soluble organic, acidolysis hydrocarbon. The microbial in different geochemical environment of rock culured and distinguished, in addition, microbial oxidation and reduction uranium simulated test proved that microbial may not only live and breed in poisonous and high content uranium ore, imple layer oxidation zone to develop and uranium to dissolve and migrate, but control uranium concentration to form deposit and place by way of biological geochemical impling uranium to reduct and precipitate by changing Eh—pH of fluid which use hydrocarbon origined from organic matter biological decomplexation as carbon resourse. This conclusion enriches metallogenetic theory of layer oxidation zone sandstone type uranium deposit, but has important practical significance in finding this kind of deposit, in-situ leach and environment harness. According to studying on biological marke chemical compound, deposit geological feature of this deposit, as well as formation condition and model of typical layer oxidation zone sandstone type uranium deposit abroad, the paper think that hydrocarbon belongs to contemporaneous reductive, does not origined from upper coal- seam and oil-gas field close to this uranium deposit, which play important role in metallogenetic process, clear that uranium deposit and coal, gas-oil is coexitence energy resources in different place of identical basin. Author poses that braided river dene in the middle Jurassic Xishanyao formation is key position for uranium exploration in the Ai-ding lake belt, must attach importance to study on local structure and mineralized information relation with layer oxidation zone, like this, goal of enlargement prospecting and the enhancement for prospecting benefical may be achieved. The result of study were proved in deposit exploration, the good ore-searching result was obtained. four commercial mineralized holes were new found. the uranium amount of resources increased xxxx tons.