世界核地质科学2026，Vol.43Issue(2)：239-258,20.DOI:10.3969/j.issn.1672-0636.2026.02.003
塔里木盆地巴楚地区阿图什组砂岩型铀矿成矿流体特征研究
Study on the characteristics of ore-forming fluids of sandstone-type uranium deposits in the Atushi formation,Bachu area,Tarim basin
摘要
Abstract
In recent years,profitable sandstone-type uranium mineralization has been discovered in the variegated red sandstone of Pliocene Atushi formation in the southern Bachu uplift,Tarim basin,indicating significant prospecting potential in this region.However,no research was reported on the source,nature,and evolution mechanism of the ore-forming fluids in this area.Therefore,the authors comprehensively applied petrographic thin section identification,scanning electron microscopy observation,major and trace element geochemistry,and stable isotope testing to systematically study the characteristics of sandstone uranium ore-forming fluids in the Bachu area.The findings are as follows:1)The sandstone of the Atushi formation is predominantly yellow in its primary depositional state,whereas the U-bearing sandstone and mineralized sandstone exhibit obvious recrystallization of micritic calcite,dolomitization,and higher organic matter contents,indicating the presence of late-stage alkaline organic hydrothermal fluid alteration.Coffinite occurs in organic matter and altered mica,while pitchblende occurs in quartz dissolution pores,reflecting that the ore-forming fluids are related to alkaline organic hydrothermal fluids.2)The geochemical characteristics of organic carbon,major elements,trace elements,and rare earth elements are significantly different from those of traditional infiltration-type(interlayer oxidation zone-type)sandstone uranium deposits,indicating that the ore-forming fluids are not uranium-bearing oxygenated groundwater but deep-derived organic reducing fluids.3)Comparison of carbon isotopes of extract group components shows that the organic fluids were originated from Cambrian source rocks,which are enriched in ore-forming elements such as U and can provide material sources for shallow uranium mineralization.In conclusion,it is considered that the ore-forming fluids in the Niaoshan area of the Bachu uplift are alkaline organic reducing hydrothermal fluids derived from deep Cambrian source rocks.This study not only enriches the theory of sandstone-type uranium mineralization but also provides certain geological basis for uranium exploration in this region.关键词
砂岩型铀矿/成矿流体/巴楚隆起/鸟山地区/阿图什组Key words
sandstone-type uranium deposit/ore-forming fluid/Bachu uplift/Niaoshan area/Atushi formation分类
天文与地球科学引用本文复制引用
张浩,卢武轩,秦明宽,郭强,刘念,武勇,杨文龙,王守玉,王远盛,丁桐..塔里木盆地巴楚地区阿图什组砂岩型铀矿成矿流体特征研究[J].世界核地质科学,2026,43(2):239-258,20.基金项目
国家重点研发计划项目"煤系战略性金属矿产的精细勘查技术与协同勘探模型"(编号:2021YFC2902004)、中核集团研发平台稳定支持科研项目(编号:地YFPT2402)和核工业北京地质研究院自主研发项目(编号:地ZY2504)联合资助 Supported jointly by the National Key R&D Program of China"Fine Exploration Technology and Collaborative Exploration Model for Strategic Metal Mineral Resources in Coal Measures"(No.2021YFC2902004),and the CNNC R&D Platform Project(No.地YFPT2402),the independently developed project of the BRIUG(No.地ZY2504) （编号:2021YFC2902004）
