地质调查与研究2016，Vol.39Issue(3)：169-176,183,9.
鄂尔多斯盆地东北部砂岩型铀矿常量元素地球化学特征及地质意义
Major elements geochemical characteristics of sandstone-type uranium deposit in north-east Ordos basin and its geological implactions
摘要
Abstract
The north-east Ordos basin is an important sandstone-type uranium mineralization province in our country. Uranium depostis are mainly hosted in the sandstones of the Jurassic Zhiluo formation. The characteristics of the major elements contents and its migration patterns during the uranium mineralization process of the purple red sandstone, green sandstone, mineralization stone, uranium ore and the gray sandstone were studied in this article. And the diagenesis and mineralization setting was also discussed based on the characteristics of the relevant major elements. The study indicats that SiO2, Al2O3 are the migration out components and CaO, MgO, K2O, Na2O, TFe2O3 are the migration in components which showing obvious activities of the major elements during the water-rock process. These major elements can be divided into 3 parts as activity (SiO2、Fe2O3、FeO、CaO), sub-activity (Al2O3、MgO、K2O、Na2O) and non-activity (TiO2、MnO、P2O5) based on the density of migration in and out. The tectonic setting of the uranium sandstone is active continental margin and continental island arc. The granodiorite in the Yinshan fold belt of the north Ordos basin may be its main sourcematerial. There is a certain positive correlation between the ratio of Fe2+/Fe3+and the uranium content in different types of sandstone samples. Uranium mineralization is strictly controlled by sage green, gray sandstone and it mainly occurred in the partial reduction on one side of the redox transitional environment. Part of the sage green sandstone has the characteristics of weak oxidizing environment which indicats a special metallogenic environment of the study area. The sage green sandstone can be used as important prospecting mark in this area.关键词
鄂尔多斯盆地/砂岩型铀矿/常量元素/地球化学特征/成岩成矿Key words
Ordos basin/sandstone uranium/major element/geochemical characteristic/diagenesis and mineral-ization分类
地质学引用本文复制引用
刘晓雪,汤超,司马献章,朱强,李光耀,陈印,陈路路..鄂尔多斯盆地东北部砂岩型铀矿常量元素地球化学特征及地质意义[J].地质调查与研究,2016,39(3):169-176,183,9.基金项目
中国地质调查项目“煤田勘查区砂岩型铀矿调查与勘查示范（DD20160127）；内蒙古东胜柴登南-布尔台地区铀矿地质调查（12120113075800）” （）
