Metallogenic conditions and prospecting direction of sandstone-type uranium deposit of Sifangtai Formation in Qian'an area, Songliao Basin
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摘要: 【研究目的】松辽盆地中部腹地乾安地区四方台组砂岩型铀成矿条件研究相对薄弱。【研究方法】本文通过岩心、测井、地震、微量等数据的综合分析，在构造、建造和改造特征综合分析的基础上，系统总结乾安地区四方台组砂岩型铀矿的成矿要素。【研究结果】认为盆地中部乾安地区四方台组具备构造天窗、深大断裂、辫状河三角洲河道砂体、良好地层铀源条件与后生改造等基本成矿条件。在此基础上首次从渗入、渗出两个角度对乾安地区四方台组的铀成矿条件分别进行了系统梳理，认为四方台组同时具备渗入和渗出两种铀成矿条件，且渗出成矿占优。基于此构建了乾安地区四方台组渗出-渗入耦合铀成矿模式，认为浅部渗入流体和深部渗出流体的交汇部位是有利成矿区，提出让字镇—查干花一带四方台组的辫状河-辫状河平原河道砂体具有较大的成矿潜力，可作为盆地腹部铀矿勘查的优先探索方向。【结论】该研究首次将渗出成矿思路引入松辽盆地四方台组红杂色建造铀成矿条件的系统评价，改变了以往渗入角度评价目标层的单一思路，可有效拓展盆地腹地红杂色层的找矿思路，进而极大拓展盆地的找矿空间。Abstract: This paper is the result of mineral exploration engineering. [Objective] The study of uranium metallogenic conditions of Sifangtai Formation in the hinterland of Songliao basin is relatively weak. [Methods] Through comprehensive analysis of core, logging, seismic, trace and other data, the tectonics, stratigraphy and transformation of Sifangtai Formation in Qian'an area has been sorted and it is the first time to systematically summarize the uranium metallogenic elements of sandstone-type uranium deposits in the the hinterland of Songliao Basin. [Results]It shows that Sifangtai Formation in Qian'an area has favorable metallogenic conditions such as structural window, deep and large faults, braided river delta channel sand belts, good uranium source conditions and epigenetic transformation. It is considered that Sifangtai formation has both infiltration and exudative uranium metallogenic conditions, and exudative metallogeny is dominant. Based on these facts, the exudation-infiltration coupling Uranium metallogenic model of Sifangtai Formation in Qian'an area, Centrel Songliao Basin, has been constructed. Finally, it is proposed that the braided river to braided river plain channel sand in Rangzhi-Chaganhua Town has great uranium metallogenic potential, which as been predicted to be the most favorable object for further exploration. [Conclusions]This study is the first to introduce exudative metallogeny into the systematic evaluation of uranium mineralization conditions in Sifangtai Formations of the Songliao Basin, changing the previous single approach of evaluating the target layer from the perspective of infiltration metallogeny. It can effectively expand the exploration thinking of the red variegated formations in the hinterland of the basin, thereby greatly expanding the prospecting range in the Songliao Basin.
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