摘要
以吐哈盆地SHT砂岩型铀矿床为研究对象,探讨了腐殖酸及其组分在铀成矿过程中的作用机理。在铀矿石中铀与有机质主要以腐殖酸吸附或腐殖酸盐形式存在。铀矿石中腐殖酸及其组分的分离实验数据进一步证实了腐殖酸,特别是其组分富啡酸与后生砂岩铀成矿富集作用的密切联系。报道了有机质在砂岩型铀矿床成矿过程中作用机理的新认识,即在氧化带有机质被氧化破坏,形成可溶性的铀腐殖酸络合物淋滤进入地下水,在地球化学过渡带以腐殖酸盐的形式沉淀下来,并造成过渡带矿石中有机碳含量的增高。
In many sandstone-type uranium deposits, it can be found that uranium is in coexistent relationship with organic matter. This paper, taking the SHT sandstone-type uranium deposit of Turpan-Hami Basin as an example, tries to ascertain the role of humic acids in concentrating uranium. Results showed that uranium concentration is closely related with the organic matter, and the organic matter in uranium ore is mainly in the form of humic acids adsorption and humate. And experimental research results of humic acids and their ingredients verify that the fulvic acid can play a more important role in concentrating uranium in the formation of sandstone-type uranium deposits. Authors suggest that in the mineralizing process of epigenetic sandstone-type uranium deposits, humic substances are destroyed and solubilized into groundwater in the oxidized sandstone zone. Some uranium could be transported by complexes of humic acids, and may be co-precipitated with humate at the geochemical barrier （redox front）. For this reason, the total mass fraction of organic carbon is often increased at the geochemical redox zone in sandstone-type uranium deposits.
出处
《世界核地质科学》
CAS
2006年第2期73-77,共5页
World Nuclear Geoscience
基金
国家"973"项目(2003CB214603)中国核工业地质局生产中的科研项目资助成果(地DD004)
关键词
砂岩型铀矿床
腐殖酸
富啡酸
成矿作用
sandstone-type uranium deposits
humic acids
fulvic acid
uranium metallogeny
