摘要:
【研究目的】近年来，北方砂岩型铀矿勘探进展迅速，白彦花铀矿为二连盆地川井坳陷新发现的中型规模砂岩型铀矿产地。通过对白彦花地区砂岩型铀矿系统研究，以期为二连盆地川井坳陷的砂岩型铀矿找矿预测和成矿规律研究提供一定价值的参考。【研究方法】本文在钻孔资料编录、编图研究、系统取样、镜下分析、地化数据整理等基础上，笔者阐述了矿区成矿地质条件、矿体分布、矿石特征以及川井坳陷的构造、沉积充填、流体作用等，讨论本区砂岩型铀矿成矿模式。【研究结果】研究区主要含矿层位为下白垩统赛汉组上段，矿体产状呈西高东低展布，且相对平缓，区域内铀矿化富集程度与隆起带边缘的低洼区域有着紧密的空间关系。铀矿物以铀石为主，主要赋存在灰色、深灰黑色砂砾岩中。区域内，主要发育辫状河-三角洲体系，砂体分布广泛，连通性较好，河道中心发育氧化还原带，成矿流体及还原性气体运移、铀源物质运移等为区域成矿提供有利条件。【结论】白彦花地区铀矿的成矿模式为下白垩统赛汉塔拉组上段沉积间断末期，来自白彦花隆起的富铀流体发生了潜水渗入作用形成了铀矿体，二连组沉积后白彦花凸起被沉积物所覆盖，适时发生了层间氧化成矿作用。
Abstract:
This paper is the result of mineral exploration engineering. [Objective] In recent years, the exploration of sandstone uranium ore in the north has progressed rapidly, and Baiyanhua uranium ore is a newly discovered medium-sized sandstone uranium ore source in the Chuanjing Depression of the Erlian Basin. The systematic study of sandstone uranium ore in Baiyanhua area is intended to provide some valuable references for the prediction of sandstone uranium ore search and the study of mineralization pattern in Chuanjing Depression of Erlian Basin. [Methods] Based on drilling data compilation, map compilation study, systematic sampling, microscopic analysis, and geochemical data compilation, the author elaborates the geological conditions of ore formation, ore body distribution, ore characteristics, and the tectonics, sedimentary filling, and fluid action of Chuanjing Depression in the mining area, and discusses the sandstone type uranium ore formation pattern in this area. [Results]The main ore-bearing level in the study area is the upper section of the Lower Cretaceous Saihan Formation, and the ore bodies are relatively gently spreading in the east and high west. The uranium minerals are mainly uraninite, mainly in gray and dark gray-black sand conglomerates. In the region, the braided riverdelta system is mainly developed, the sand bodies are widely distributed and well connected, and the redox zone is developed in the center of the river, which provides favorable conditions for regional mineralization by mineralizing fluids and reducing gas transport and uranium source material transport. [Conclusion] The mineralization pattern of uranium ore in Baiyanhua area is that the uranium-rich fluids from the Baiyanhua Bulge occurred at the end of sedimentary interruption in the upper part of the Lower Cretaceous Saihantala Formation, and the uranium ore bodies were formed by diving and infiltration of uranium-rich fluids from the Baiyanhua Bulge, and the Baiyanhua Bulge was covered by sediments after the deposition of the Erlian Formation, and interstratified oxidation mineralization occurred in due course.
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