摘要
本文以华南容矿主岩为震旦-寒武系碳硅泥岩型铀矿床为例,探讨了铀矿化与有机质、放射生成热和红盆地的关系及矿床地球化学特征.文章认为:有机碳与铀之间存在着复杂的关系;高铀含量样品中脱碳化和褐红色铁染斑可能与放射性产生的热和强氧化基团有关;铀矿床与红盆地的密切时空关系在于红盆地形成时派生了层滑断裂,促成了含铀建造的改造成矿;表观无热液显示的铀矿床稀土元素特征与围岩迥然不同,表明铀和稀土元素都曾活动过,即使在典型的"沉积成岩型"铀矿床也是如此.
Taking carbonate-siliceous-pelitic uranium deposits hosted in Sinian and Cambrian, South China, as an example, this paper deals with the geochemical characteristics of the uranium deposits and the relationships of uranium mineralization to organic matter, radiogenetic heat and red basins. The results ate drawn as follows: a) there exists a complex relation between organic carbon and uranium: b) in the samples with high uranium content, decarbonation and oxidation specks of iron may be caused by radioactivity, which generates heat and particles with strong oxidizing ability; c) the relation between uranium deposits and red basins lies in that the formation of red basins-derived bedding slip faults which made uranium-bearing formations reworked and enriched into deposits; d) in the uranium deposits which have no hydrothermal display in apparence, uranium ores differ from wall rocks in the geochemistry of rare earth elements. This manifests that uranium and REE have been moved greatly, even in the typical sedimentary diagenetic uranium deposits.
出处
《地质找矿论丛》
CAS
CSCD
1992年第1期103-110,共8页
Contributions to Geology and Mineral Resources Research
