Academic Journal
柴达木盆地西南缘古-新近系砂岩型铀矿化特征 与成矿条件分析.
| العنوان: | 柴达木盆地西南缘古-新近系砂岩型铀矿化特征 与成矿条件分析. (Chinese) |
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| Alternate Title: | Characteristics and Metallogenic Conditions of Paleo-Neogene Sandstone-type Uranium Mineralization in the Southwestern Margin of Qaidam Basin. (English) |
| المؤلفون: | 王贵, 陈擎, 陈云杰, 陈斌, 邵恒博 |
| المصدر: | Uranium Geology; 2024, Vol. 40 Issue 6, p1042-1052, 11p |
| Abstract (English): | In order to analyze the metallogenic potential of sandstone type uranium deposit in Paleogene-Neogene in the southwestern margin of Qaidam Basin, the source conditions, structure, sedimentary formation, hydrogeology, epigenetic alteration and uranium mineralization characteristics in the study area were studied . It was concluded that Oligocene Lower Ganchaigou Formation, Miocene Upper Ganchaigou Formation, Lower Youshashan Formation, Pliocene Upper Youshashan Formation and Shizigou Formation are the main prospecting target layers for sandstone-type uranium deposits and with good prospecting prospects. During the Oligocene-Pliocene, the Qaidam area became a large-scale depression basin and developed river and delta sedimentary systems. Among them, large-scale braided channels and fan-shaped sand bodies were formed in the southwestern margin. The sand body was thick, with stable mud-sand-mud structure, the uranium source was abundant, and the recharge -run off -discharge dynamic system was well developed. The reduction capacity of the sand body is favorable for the formation of infiltration-exudation composite uranium mineralization. The uranium mineralization in the area can be roughly divided into two stages: the Paleocene-Miocene pre-enrichment stage by sedimentary diagenesis and the infiltration-exudation composite genetic uranium metallogenic stage since the Late Pliocene. Genetically, uranium mineralization is of great potential in the southwestern margin of Qaidam Basin [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): | 为了分析柴达木盆地西南缘古-新近系砂岩型铀成矿潜力, 文章针对研究区的铀源条件、构造、沉 积建造、水文地质、后生蚀变及铀矿化特征等进行研究后, 认为区内古-新近系具有较好的砂岩型铀矿找矿前 景。渐新统—上新统沉积期, 柴达木盆地转为大型坳陷盆地阶段, 盆地内发育河流、三角洲沉积体系, 其中在 西南缘发育有规模较大的辫状河道及扇状砂体, 砂体厚度大, 泥-砂-泥结构稳定, 铀源丰富, 补-径-排水动力 体系发育完善; 同时区内广泛发育的油气为铀成矿提供了充足的还原介质, 增加了砂体的还原容量, 形成了层 间氧化-油气还原复成因的铀矿化。区内铀成矿作用大致可分为: 古新世-中新世沉积成岩预富集阶段和上新世 晚期以来的层间氧化-油气还原的铀成矿阶段。 [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: | Complementary Index |
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