Uranium enrichment in a paleo-karstic bauxite deposit, Yunfeng, SW China: Mineralogy, geochemistry, transport – deposition mechanisms and significance for uranium exploration
作者: Yongzhen LongGuoxiang ChiJianping LiuDexian ZhangHao Song
作者单位: 1Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
2School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
3Department of Geology, University of Regina, Saskatchewan, S4S 0A2, Canada
4Chengdu University of Technology, Chengdu, 610059, China
刊名: Journal of Geochemical Exploration, 2018, Vol.190 , pp.424-435
来源数据库: Elsevier Journal
DOI: 10.1016/j.gexplo.2018.04.010
关键词: Paleo-karsticBauxite depositUranium mineralsEPMARaman spectroscopyYunfengGuizhou
原始语种摘要: Abstract(#br)Elevated concentrations of uranium have been found in many bauxite deposits, but the status of uranium in the ores and the mechanisms of enrichment have not been well understood. In this paper, we report a new case of uranium enrichment in a paleo-karstic bauxite deposit at Yunfeng, southwestern China, present electron probe micro-analyzer (EPMA) and Raman spectroscopic evidence for the presence of separate U-minerals, and propose a model in which uranium was enriched through successive processes from chemical weathering through early to burial diagenesis. The Yunfeng bauxite ores, developed in Lower Carboniferous mudrocks overlying Middle to Upper Cambrian carbonate rocks, contain 18.0 to 62.4 ppm (average 35.1 ppm) U, which is much high than the abundances in average...
全文获取路径: Elsevier  (合作)
影响因子:1.952 (2012)

  • geochemistry 地球化学
  • exploration 勘探
  • uranium 
  • deposit 沉积
  • karstic 岩溶的
  • transport 输运
  • significance 显著性
  • enrichment 富集
  • spectroscopy 分光学
  • minerals 矿物