摘要
以吐哈盆地十红滩砂岩型铀矿床为例,利用U-Pb同位素体系演化特征,计算含矿砂岩和顶底板泥岩的原始铀质量分数及变化系数,认为赋矿地层沉积时就存在铀的预富集,同生沉积碎屑岩和泥岩都是本区重要的铀源。结合古水文地质演化和碳-氧同位素特征,认为成岩期泥岩压榨水携带铀进入砂岩含水层,在砂岩中产生铀的预富集。
By taking Shihongtan sandstone-type uranium deposit in Tulufan-Hami Basin as an example,parameters of U-Pb isotopic evolution system are used to calculate the initial uranium content and its variation coefficient of ore-hosted sandstone and its roof and floor mudstone.It is considered that uranium pre-enrichment occurred during ore-hosting strata formed,both the sandstone and mudstone could act as important uranium sources.According to the evolution of palaeo-hydrogeology and the characteristics of carbon and oxygen isotopes,water squeezed out from mudstone might carry uranium into sandstone in diagenetic stage and uranium was pre-enriched in sand bodies.
出处
《世界核地质科学》
CAS
2010年第3期130-133,共4页
World Nuclear Geoscience
关键词
原始铀含量
铀源
泥岩
压榨水
initial uranium content
uranium sources
mudstone
diagenetic water
