铀矿地质2025，Vol.41Issue(3)：403-423,21.DOI:10.3969/j.issn.1000-0658.2025.41.028
准噶尔盆地东部北三台凸起新近系沙湾组铀成矿特征及找矿方向
Uranium Metallogenic Characteristics and Prospecting Direction in Neogene Shawan Formation of Beisantai Uplift in the Eastern of Junggar Basin
摘要
Abstract
Beisantai uplift is located at the transitional zone between the Central Depression and Eastern Uplift in the southeastern margin of Junggar Basin,exhibiting a general north-high-south-low topography,the primary target horizon is the uranous Neogene Shawan Formation.Based on field geological surveys,borehole logging,and integrated well logging,this study investigated the uranium mineralization characteristics and future prospecting directions of Shawan Formation by means of petrographic identification,grain size analysis,chemical analysis,scanning electron microscopy(SEM),and electron probe microanalysis(EPMA).The research achievements include:clastic rocks in Shawan Formation are dominated by lithic sandstone and lithic arkose,with moderate to poor sorting.Probability cumulative curves and C-M diagrams indicate strong hydrodynamic conditions during deposition,characteristic of proximal source rapid transport and accumulation.Mineralized core segments exhibit a weak epigenetic oxidation environment.Both oxidized sandstone and bluish-gray ore-bearing sandstones show Fe³⁺/Fe²⁺ ratios>1,low organic carbon content,and elevated total sulfur in reduced sandstones,suggesting the post-depositional alteration by hydrocarbon-related fluids from deep petroleum systems.Uranium occurs predominantly as coffinite,with minor uranous titanium oxides.Coffinite develops as granular aggregates or massive clusters in intergranular pores,partially filling the dissolution pores or fractures in detrital grains.It also occurs as colloidal or veinlet forms around large colloidal pyrite,displaying replacement or encapsulation relationships.Uranium mineralization in Shawan Formation is closely linked to hydrocarbon activity,whose migration pathways are the unconformity surfaces,fault systems,and secondary fractures and the migration enhances the reducing capacity of sand bodies,promoting uranium enrichment and precipitation.Therefore,future exploration should prioritize areas with hydrocarbon enrichment,fault zones,sand body development,and epigenetic alteration.关键词
铀成矿特征/找矿方向/沙湾组/北三台凸起/准噶尔盆地Key words
uranium mineralization characteristics/prospecting direction/Shawan Formation/Beisantai uplift/Jungar Basin分类
天文与地球科学引用本文复制引用
吴声明,陈念楠,唐湘飞,贾为卫,张树新..准噶尔盆地东部北三台凸起新近系沙湾组铀成矿特征及找矿方向[J].铀矿地质,2025,41(3):403-423,21.基金项目
中国核工业地质局项目"新疆准噶尔盆地铀矿资源调查评价与勘查(编号:202406) （编号:202406）
新疆自治区重大科技专项"新疆准噶尔铀成矿带成矿规律与勘查增储研究"(编号:2024A03003) （编号:2024A03003）
"新疆准噶尔盆地卡姆斯特及外围地区铀矿资源调查评价"(编号:202406-3) （编号:202406-3）
"新疆及藏北地区低工作程度及空白区铀矿资源远景评价"(编号:202348-2) （编号:202348-2）
江西省东华理工大学研究生创新基金"准噶尔盆地西缘车排子凸起新近系砂岩型铀矿矿物学特征及成矿机理研究"(编号:YC2024-B204)联合资助. （编号:YC2024-B204）
