流体包裹体在东胜砂岩铀矿成矿研究中的应用

he reduction explains the main mechanism of the precipitation of uranium mineral bed. Dongsheng sandstone-type uranium deposit’s reducing agents can be one of oil, gas, coal and uranium or some of them. Systematic study of organic petrology and testing of gas inclusion indicates that： in the formation of sandstone uranium only exist a few vitrain or clarain bands, and the inclusions were mainly gas-liquid fluid inclusions with minor oil fluid inclusions. Therefore, Dongsheng sandstone-type uranium deposit’s reducing agents can not be coal or oil. The frequency of grains containing oil inclusions (GOI) are less than 1% in most of the samples, the maturity of Mesozoic Stratum is been in critical mature status (0.40%~0.55VRo), and there are not oil source rocks around Dongsheng sandstone-type uranium deposit. Also, liquid hydrocarbons are not the uranium deposit’s reducing agents. Tracing of inclusion’s hydrogen and oxygen stable isotopes of carbonate cement and lower C-O isotopes indicate that, the main reducing agents for uranium mineralization of Dongsheng sandstone-type uranium deposit are organic hydrocarbon gas, which is rich in organic hydrocarbon gas such as CH4.