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- Title
钱家店铀矿田草莓状黄铁矿特征及 其地质意义.
- Authors
东艳; 黄少华; 王鹏; 刘章月; 耿英英
- Abstract
Framboidal pytite play an important role in indicating paleoenvironment of sedimentary rocks. The main ore-bearing strata in Qianjiadian ore field are Qingshankou Formation and Yaojia Formation, which are primary red complex rock series. At present, there are great differences in the primary redox property of internal grey sand body deposition period, which directly affects the uranium exploration deployment in the region. In this paper, the occurrence characteristics, sulfur isotope and particle size characteristics of strawberry-like pyrite in grey sand were systematically studied, and the paleo-oxidation-reduction conditions of water body in target horizon during deposition-diagenesis period were inverted for the first time by analyzing its particle size characteristics, and then the significance of uranium mineralization was discussed. The results showed that framboidal pytite in grey sand body of Qianjiadian ore field was mainly formed in sedimentarydiagenetic period. The bulk of sulfur isotope-37.5 ‰ ~-23.4 ‰, is the produets of microbial reduction at low temperature. The particle size distribution of framboidal pytite in Yaojia Formation and Qingshankou Formation is respectively 1.6~28 μm, 0.8~52 μm, MD are 8.0 μm and 9.3 μm, MFD are 28 μm and 52 μm,respectively. The particles with particle size greater than 10μm accounted for 21.8 % and 28.3 %, respectively.The results showed that the particle size of framboidal pytite in Yaojia Formation was generally smaller than that in Qingshankou Formation, and Qingshankou Formation had a wide distribution range, but the two formations had similar statistical distribution laws of particle size. The binary diagrams of mean particle size versus standard deviation and skewness coefficient of framboidal pytite indicated that the paleowater body was hypo oxidized during the deposition of ore bearing target layer. This is one of the main reasons that no flank ore bodies was developed in the ore-bearing strata and only one ash stratum clamp redox zone occurred longitudinally in two red strata; the primary reduction capacity of the bottom grey sand body is limited, and it is not enough to form large-scale industrial uranium deposits, which suggest that the oil and gas seepage reduction in the Lower Cretaceous is the key factor and necessary condition for large-scale uranium mineralization of sandstone in the area.
- Publication
Uranium Geology, 2023, Vol 39, Issue 2, p202
- ISSN
1000-0658
- Publication type
Article
- DOI
10.3969/j.issn.1000-0658.2023.39.018