This paper is the result of mineral exploration engineering.[Objective]The faded alteration of uranium-bearing rock series in the redbed is closely related to reductive alteration,and the analysis of the characteristics of faded alteration and its genetic fluid is of great significance for understanding the uranium ore-forming fluids and ore-forming mechanism.[Methods]This study is based on analyzing the sedimentary characteristics and faded alteration characteristics of sandstones in Luohe Formation by means of core logging,element geochemical test,electron microscope scanning,electron probe analysis,XRF scanning and core infrared spectrum scanning.[Results]The sandstones in the Luohe Formation are basically formed in aeolian sedimentary with oxidation conditions mineral assemblages enriched in uranium minerals,pyrite and gypsum but little trivalent iron oxides,and uranium and sulfur elements show obvious migration.Then,the redox state of sandstone and the correlation between uranium mineralization and faded alteration were discussed.[Conclusions]The main body of Luohe Formation sandstone was formed in aeolian deposits under oxidation conditions,and its color,Fe2O3/FeO,Th/U and Cu/Zn reflect that the environment has been changed from oxidation to reduction with the increase of sandstone faded degree.The characteristics of the consistency between faded alteration and uranium mineralization in Luohe Formation in space,mineral association and redox state suggest that their genesis is related to the same reducing fluid.
关键词
砂岩型铀矿/褪色蚀变/矿产勘查工程/洛河组/彭阳地区/鄂尔多斯盆地
Key words
sandstone type uranium deposit/faded alteration/mineral exploration engineering/Luohe Formation/Pengyang area/Ordos Basin
维普
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