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阐明了松辽盆地西南部地质构造演化历史,指出蚀源区岩石和盆地构造演化史对形成富铀砂体和层间氧化带及提供铀源有利。确定了钱家店凹陷姚家组是该区寻找砂岩型铀矿的目的层。基于成矿条件分析,预测了成矿远景区;落实了一个具有相当规模的砂岩型铀矿床。基本查明了含矿地层的结构和砂体的特征、矿石物质成分和铀的存在形式、矿石伴生元素组成及综合利用价值。在成矿规律及矿床成因研究方面指出沉积成岩期铀的预富集是铀成矿的基础;层间氧化作用是后生再富集的决定因素;油气的还原作用是再富集的重要条件。铀矿石的U-Pb等时线年龄为53±3Ma和7±0Ma,与有利于层间氧化作用发育和铀成矿作用的干旱-半干旱的古气候期相符。确定了钱家店铀矿床是属于与油气二次还原作用有密切关系的层间氧化带型砂岩铀矿床,并建立了该类型铀矿床成矿模式。
The history of geological tectonic evolution in the southwestern Songliao Basin is clarified. It is pointed out that the tectonic evolution history of the rocks and basins in the source area is favorable for the formation of enriched uranium sand bodies and interlayer oxidation zones and the supply of uranium sources. It is confirmed that the Yaojia Formation in the Qianjiadian Depression is the target layer for finding sandstone-type uranium deposits in this area. Based on the analysis of metallogenic conditions, the prospecting area is predicted; a sandstone-type uranium deposit with a considerable scale is implemented. Basically identified the structure of the ore-bearing strata and sand body characteristics, the composition of ore and uranium form of material, associated elements of ore composition and comprehensive utilization value. It is pointed out that the pre-enrichment of uranium during depositional diagenesis is the basis of uranium mineralization in the study of metallogenic regularity and genesis of deposits. The inter-layer oxidation is the decisive factor for the subsequent enrichment. The reduction of oil and gas is an important condition for re-enrichment. The U-Pb isochron age of uranium ores is 53 ± 3 Ma and 7 ± 0 Ma, consistent with the arid-semiarid paleoclimate that favors the development of interlayer oxidation and uranium mineralization. It is confirmed that the Qianjiadian uranium deposit belongs to the interlayer oxidation zone type sandstone uranium deposit which is closely related to the secondary reduction of oil and gas, and the metallogenic model for this type of uranium deposit is established.