高校地质学报2016，Vol.22Issue(1)：53-59,7.DOI:10.16108/j.issn1006-7493.2015029
东胜铀矿砂岩中方解石富集及铀矿成因
The Enrichment of Calcite and the Genesis of Uranium Deposits in Dongsheng Uranium Sandstone
摘要
Abstract
Research on calcite in Dongsheng uranium area is carried out including the enrichment characteristics, inorganic carbon and oxygen isotopes, neighboring gas reservoirs inclusions trapping pressure, organic carbon isotopes and 3He/4He ratios. The results show that there is a close relationship between Dongsheng uranium mineralization and deep natural gas. The δ13C values range from-19.6‰to-1.11‰and theδ18O values range from-17.13‰to-9.00‰in calcite. The values ofδ13C vary widely, maybe due to the influence of surface water and deep natural gas. The gas reservoirs inclusion trapping pressures decreased from the deep to the superficial part and from southwest to northeast in northern Ordos Basin, indicating that natural gas has supplied sufficient reducer for the conversion of uranium necessary for the formation of large-scale uranium. The 3He/4He ratio in natural gas indicates that Dongsheng Zhiluo uranium sandstone has no meaningful contribution from mantle fluids. The evidence shows that the calcite is a result of joint actions of surface water and deep gas in Dongsheng uranium sandstone, suggesting that Dongsheng large-scale uranium deposit was formed by the effect of cryogenically mixed mineralization.关键词
方解石/碳氧同位素/3He/4He比值/东胜铀矿Key words
calcite/carbon and oxygen isotopes/3He/4He ratio/Dongsheng uranium deposit分类
天文与地球科学引用本文复制引用
冯乔,秦宇,付锁堂,柳益群,周鼎武..东胜铀矿砂岩中方解石富集及铀矿成因[J].高校地质学报,2016,22(1):53-59,7.基金项目
海外及港澳学者合作研究基金(41428201) （41428201）
国家重点基础研究发展计划"973"项目(2003CB214603)资助 （2003CB214603）
