华南碳硅泥岩型铀矿床的地质特征分析

A PROBE ON GEOLOGICAL FEATURES OF CARBONATE-SILICEOUS-PELITIC URANIUM DEPOSITS IN SOUTH CHINA

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.