鄂尔多斯盆地北部砂岩型铀矿地球化学研究进展

摘要

This paper describes the progress of new research about sandstone-type uranium deposits from elemental geochemistry,isotopic geochemistry and organic geochemistry in the Northern Ordos Basin.Through elemental geochemistry,researchers understand the geochemical characteristics of ores and wall rocks,the geological environment of uranium mineralization and the relationship between ores and wallrock.The stage of uranium mineralization period was determined by isotopic geochronology.The researchers constructed the area＇s thermal history by fission tracks.Ore-forming age similar to thermal history suggests the link between the ore-forming and the tectonic evolution.The uranium source,the source of the ore-forming fluids and the role played by organic matter in uranium have been discussed by the comprehensive consideration of the results of isotopic geochemistry,organic geochemistry and fission track studies.%叙述了元素地球化学、同位素地球化学和有机地球化学等方面在鄂尔多斯盆地北部砂岩型铀矿的研究新进展。该区的研究成果丰硕。从元素地球化学的研究明确了矿石及其围岩的岩石地球化学特征,讨论了铀成矿的地质环境,围岩与铀成矿的关系。利用同位素地球化学的方法厘定了铀的成矿时代,利用裂变径迹的研究构建了该区的地质热力学演化历史,推测了成矿时代与构造演化历史之间的联系。综合同位素地球化学,有机地球化学和地质热力学演化等多方面的观点讨论了铀源和成矿流体的来源及有机质在铀成矿中发挥的作用。