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- Title
松辽盆地南部海力锦铀矿床姚家组下段 黏土矿物特征及其铀成矿意义.
- Authors
宁君; 李继木; 卢天军; 佟术敏; 张亮亮; 王海涛; 黄少华
- Abstract
Clay minerals are important to the study of geochemical environment of the ore-bearing layer of sandstone-type uranium deposits and the investigation of fluid-rock reaction process. The lower member of Yaojia Formation in Hailijin deposit that was recently discovered in the Qianjiadian sag was studied with microscopy, X-ray diffraction, scanning electron microscopy, and energy spectrum to examine the petrographic characteristics of rocks in various petro-geochemical zones, and the clay mineral combination, content and microscopic morphology. The results showed that the native clay mineral assemblage of red and gray mudstone in the lower member of Yaojia Formation were mainly composed of high content illite-smectite mixed-layer and low levels kaolinite, which was consistent with the arid and warm paleoclimate condition during the deposition period. The content of clay minerals of mudstone is positive or negative correlated indicating that they underwent mutual-transformation during the diagenetic evolution. The clay minerals of the sandstones with different geochemical properties are all predominantly consisted of kaolinite, followed by illite-smectite mixed-layer, which are distinctly different from the mudstones. This was believed the result of post-exogenic exotic acidic fluid seepage alteration that occurred prior to the infiltration of regional interlayer oxidized water.No clear correlation was established between the uranium and clay minerals content. Combining the microscopic evidence of uranium-clay occurrence and the structural-fluid evolution history of the region,uranium in sandstone was suggested to be precipitated and enriched under the comprehensive action of various adsorption reductants. The modification from early-stage acidic and reducing foreign fluid was the key controlling factor for uranium mineralization of the lower member of Yaojia Formation that have primary weakly reductive capacity.
- Publication
Uranium Geology, 2023, Vol 39, Issue 2, p188
- ISSN
1000-0658
- Publication type
Article
- DOI
10.3969/j.issn.1000-0658.2023.39.017