| 松辽盆地西南部上白垩统姚家组原生黏土矿物组合特征及其找铀意义 |
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| 关键词:clay minerals primary minerals fluid trajectory Yaojia Formation sandstone type uranium deposit Qianjiadian area |
| 基金项目:国家重点基础研究发展计划(973计划)“中国北方巨型砂岩铀成矿带陆相盆地沉积环境与大规模成矿作用”(编号: 2015CB453000);中国地质调查局项目“油气田勘查区砂岩型铀矿调查与勘查示范”(编号: DD20160128) |
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| 摘要点击次数: 1932 |
| 全文下载次数: 1965 |
| 摘要: |
| Characteristics of Primary Clay Minerals in the Upper Cretaceous Yaojia Formation of Southwest Songliao Basin and Their Significance |
| Clay minerals are important products of the epigenetic ore-forming fluid’s water-rock reaction in sandstone type uranium deposits. In this paper, using the core spectrum scanning technique as the main research method in combination with such means as field geological logging, polarizing microscope and scanning electron microscopy (SEM), the authors conducted for the first time systematic alteration mineral mapping of 88 drill holes in the Qianjiadian uranium deposit as well as the neighboring areas and extracted information of the main clay minerals and ferric iron oxides. The result shows that the primary clay mineral assemblage of Yaojia Formation, which is the main uranium-producing layer, is “illite+illite and montmorillonite immiscible layer (or montmorillonite)”, with only a small amount of kaolinite and chlorite. These features are similar to characteristics of clay minerals in northern Songliao Basin, being the palaeoclimate response in the sedimentary period. However, the content of kaolinite has an obvious positive correlation with that of uranium minerals in the ore section, which is an important indicator of the locus of the ore-forming fluid. The ore-forming information of clay minerals and ferric iron oxides of primary sandstone tends to exhibit stratified or rhythmic variation, whereas the information of clay minerals and trivalent iron oxides often exhibit “ongue shape” or “normal curve” features. These characteristics serve as important criteria to judge the color of the original sandstone and trace the epigenetic metallogeny, thus having great significance for the study and prospecting of sandstone type uranium deposits. |
| LI Jian-guo,JIN Ruo-shi,ZHANG Bo,MIAO Pei-sen,YANG Kai,LI Hong-liang,WEI Jia-lin,AO Cong,CAO Min-qiang,ZHANG Hong-liang,ZHU Qiang.2018.Characteristics of Primary Clay Minerals in the Upper Cretaceous Yaojia Formation of Southwest Songliao Basin and Their Significance[J].Acta Geoscientica Sinica,39(3):295-305. |
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