库捷尔太铀矿床的生物标志化合物研究

Biomarker Compounds of Kujieertai Uranium Deposits

在研究砂岩型铀矿床时,发现铀与有机质的关系密切。通过对新疆伊犁盆地库捷尔太铀矿床的正烷烃、甾烷和萜烷等有机地球化学及生物标志化合物的研究表明,主峰碳数以C29,C31为主,具有明显的奇偶优势。因此,认为库捷尔太铀矿床中有机质的先质母体主要为高等植物,个别样品为混合物源输入。同时,笔者结合地质实际情况和某些生物标志化合物参数,判断该地区为淡水沉积环境,这种沉积环境有利于高等植物的生长和保存。而铀的富集与高等植物的繁盛有关。所以,这种沉积环境对铀的沉淀富集具有非常重要的作用,主要表现为还原沉淀和物理吸附。

In the study of sandstone type uranium deposits, it can be found that uranium is closely related to organic matter. This paper studies the alkane, steranes and terpanes of organic geochemistry and biomarkers of Kujieertai uranium deposits in Yili Basin. The results of these analysises shows the peaks of nalkanes is mainly at C29 or C31, and shows odd or even carbon member predominant. It indicates that the main source of organic matter of Kujieertai uranium deposits would be higher plants, and the exceptional sample's source of organic matter would be mixture. At the same time, based on geological facts and some biomarkers, it is considered that the sedimentary environment be fresh water environment. This environment is advatageous to growth and preservation of higher plants. Precipitation and enrichment of uranium is closely relative to bloom of higher plants, mainly acted as reducing agents and adsorbents.