Sedimentary facies of the Lower Jurassic Sangonghe Formation and its relationship with uranium mineralization in Mengqiguer area of Yili Basin, Xinjiang
Chen Fenxiong1, 2, Nie Fengjun1, Zhang Chengyong1, Zhang Zhanfeng2
1 School of Earth Science,East China University of Technology,Nanchang 330013,Jiangxi; 2 Geologic Party No.216,CNNC,Urümqi 830011,Xinjiang
Abstract：Mengqiguer deposit is a large sandstone type uranium deposit discovered in recent years in Yili Basin of Xinjiang. Baesd on the lithology,sedimentary structures,sedimentary sequence,outcrop description and profile comparison,we explained the conditions and mechanism of uranium mineralization of the Lower Jurassic Sangonghe Formation in the study area. It is suggested that the fan delta front facies is the main type of sedimentary facies,including underwater distributary channel,distributary interchannel,underwater crevasse splay etc.,while the river mouth bar is not developed. The influence of sedimentary microfacies on uranium mineralization in the study area is mainly manifested in four aspects:(1)The sand body connectivity provided the spale for ore-forming fluid migration. (2)The underwater distributary channel sand is the main factor controlling the oxidation zone. (3)The sand body variation caused by changes of sedimentary microfacies made the ore body wider,thicker and uranium grade increase. (4)The mudstone skylight caused by underwater crevasse splay is one of the key factors in crossflow forming.
Chen Fenxiong,Nie Fengjun,Zhang Chengyong et al. Sedimentary facies of the Lower Jurassic Sangonghe Formation and its relationship with uranium mineralization in Mengqiguer area of Yili Basin, Xinjiang[J]. JOPC, 2016, 18(5): 833-842.
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