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金塔盆地北缘野马井地区东部凹陷为典型的山间凹陷，目前铀矿地质研究程度极低。为突破传统“大盆地、大砂体、找大矿”思路，探索富铀岩体周缘小型凹陷的铀成矿潜力，采用地质剖面测量、地面能谱测量、电磁剖面测量、土壤氡气面积测量以及微量元素分析与扫描电镜分析等综合技术，系统分析了该区砂岩型铀成矿条件。结果显示：凹陷周缘大面积出露石炭纪富铀二长花岗岩(地表捡块样铀含量最高达102×10-6)，且下白垩统赤金堡组自身具铀预富集特征，铀源条件优越；凹陷整体呈向斜构造，发育于“U”型汇水构造中，赤金堡组具“泥-砂-泥”结构，砂体垂向厚度一般介于40～260 m之间，后生蚀变以潜水氧化和地表淋滤为主；地表放射性强度高(砂岩平均铀含量91.9×10-6，最高217×10-6)，土壤氡气异常区分布面积大，地表矿石中可识别出沥青铀矿、锐钛矿和方钍石等铀及伴生矿物。上述研究证实该凹陷铀成矿条件优越，成矿类型为沉积成岩+潜水氧化，但成矿规模可能有限。研究可为西北地区同类小型盆地(凹陷带)的砂岩型铀矿找矿提供参考和借鉴。
Abstract：The eastern sag in the Yemajing area of northern Jinta basin is a typical intermontane depression,where the uranium geological research is currently limited. To explore the uranium mineralization potential of small depressions surrounding uranium-rich pluton, this study systematically analyzed the sandstone-type uranium metallogenic conditions in this area using comprehensive techniques including geological profile surveying, ground gamma spectrometry, electromagnetic survey, areal soil radon gas measurement, trace element analysis, and scanning electron microscopy. The results show that uranium-rich Carboniferous monzogranites(surface grab samples uranium content up to 102×10-6) are widely exposed around the depression, and the Lower Cretaceous Xiagou formation itself exhibits pre-enrichment uranium characteristics,indicating superior uranium source conditions. The depression as a whole exhibits a synclinal structure developed within a “U”-shaped catchment configuration. The Xiagou formation has a “mudsand-mud” sequence, with vertical sandstone thickness generally ranging from 40 to 260 m, and the epigenetic alterations are dominated by phreatic oxidation and surface leaching. The surface radioactivity is high(average uranium content of sandstone 91.9×10-6,maximum 217×10-6),and the soil radon anomaly is of extensive area. Uranium and associated minerals such as pitchblende, anatase, and thorianite can be identified in surface ores. The above findings confirm that this depression has favorable uranium metallogenic conditions, with the mineralization type being sedimentary-diagenetic plus phreatic oxidation(basal paleochannel type), but the mineralization scale may be limited. This research provide a reference for sandstone-type uranium exploration in similar small basins(depression zones) in northwestern China.
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基本信息:
中图分类号:P619.14
引用信息:
[1]张字龙,王凤岗,周俊杰,等.金塔盆地北缘野马井地区东部凹陷砂岩型铀成矿条件综合分析[J].世界核地质科学,2026,43(04):690-701.
基金信息:
核技术研发科研项目（编号：地H2501）资助~~
2026-06-25
2026-06-25
2026-06-25