东胜砂岩型铀矿微量元素地球化学特征初探

近年来 ,鄂尔多斯盆地在石油和天然气勘查取得重大进展的同时 ,在盆地北部东胜地区也发现了可地浸砂岩型铀矿床 ,标志着我国地浸砂岩型铀矿勘查取得了重要突破。从微量元素地球化学入手 ,初步总结了东胜地区砂岩型铀矿的微量元素地球化学特征 ,与新疆伊犁和中亚典型的层间氧化带型砂岩铀矿进行了对比 ,分析探讨了铀成矿作用 ,认为东胜砂岩型铀矿成矿作用虽与氧化还原过渡带有关 ,也具外生和深源双重性质的微量元素组合 ,不同于单一的外生水成层间氧化带型砂岩铀矿 ,铀成矿过程中有深部物质和含煤层气或油气流体参与。

TRACE ELEMENT GEOCHEMISTRY OF SANDSTONE-TYPE URANIUM DEPOSITS IN DONGSHENG AREA

In recent years, the in-situ leachable sandstone type-uranium deposits have been found in the Dongsheng area while great progress has been made the great progress in oil and natural gas exploration in the Ordos Basin. It has marked a breakthrough in exploration of the sandstone-type uranium deposits. In terms of trace element geochemistry, this paper summarized the trace element geochemical characteristics of the sandstone-type uranium deposits in the Dongsheng area. By comparing interlayer-oxidation zone sandstone uranium deposits with those in the Yili Basin, Xinjiang and Central Asia, and analyzing the minerogenesis of such uranium deposits, the authors think that the sandstone-type uranium deposits in Dongsheng are related to the intermediate zone of oxidation and reduction, but has associations with trace elements of external and deep sources. It is different from oxidation-zone sandstone uranium deposits in which other unboiled water was involved. Deep interior material and gas-generating coal or oil and gas-bearing fluid took part in minerogenetic process of uranium deposits.