新疆十红滩砂岩型铀矿床基本特征及成因分析  

Geological Characteristics and Genesis of the Shihongtan Sandstone-type Uranium Deposit, Xinjiang

作　　者：权志高 李占双 

机构地区：[1]核工业咸阳二○三研究所,712000

出　　处：《地质论评》2002年第4期430-436,共7页Geological Review

摘　　要：新疆十红滩铀矿床是中国近年发现的层间氧化带型砂岩铀矿床。该矿床位于吐鲁番—哈密盆地西南部的艾丁湖斜坡带西侧,赋矿地层为中侏罗统西山窑组辫状河—曲流河相的含煤碎屑岩系;矿体严格受发育于河道砂体中的层间氧化带前锋线控制,矿体形态呈卷状或板状;含矿岩石主要为灰—深灰色疏松和次疏松细—粗粒长石石英砂岩,铀主要以吸附形式存在;全岩Pb同位素测定的主成矿年龄为24 Ma。研究认为:晚侏罗世后,持续干热气候条件下,层间氧化带的充分发育,高含氧水在富铀地层砂体中持续向前运移,在富还原剂地球化学障形成铀沉淀富集,是该铀矿床的成因。The Shihongtan uranium deposit in Xinjiang is an interlayer oxidized zone type sandstone uranium deposit, which was found a few years ago in China. The deposit is located in the Aidinghu clinoform belt, west of the Turpan depression in the Turpan-Hami basin. The ore-hosting bed is coal-bearing detrital rocks of braided meandering stream facies in the Middle Jurassic Xishanyao formation. The orebodies are controlled strictly by the leading edges of interlayer oxidized zones, developed in fluvial sand bodies. The orebodies are curly or tabular in form. The ore-bearing rocks are mainly grey-dark grey, loose and sub-loose, fine-coarse feldspathic quartz sandstone. Uranium occurs in an adsorption manner. The main ore-forming age given by the whole-rock lead isotope assaying is 24 Ma. The authors consider that the genetic mechanism of the uranium deposit is as follows. After the Late Jurassic, interlayer oxidized zones were fully developed in a long-term xerothermic condition and highly oxygenated water moved forward continuously in sand bodies of uranium-rich strata. As a sequence, uranium was precipitated and enriched in geochemical barriers enriched in reduction agents to form such a uranium ore deposit

关 键 词：砂岩型铀矿床 层间氧化带 成因机制 新疆 吸附形式 铅同位素 赋矿地层 

分 类 号：P619.14[天文地球—矿床学]