The Research On The Relationship Between Organatic And The Mineralization Of Uranium In Ordos

Ordos Basin is one of the greatest Energy Mineral Deposits basins in China. Different epoch and kinds of Energy Mineral Deposits are concurrent here, so Ordos Basin provides a rich large-scale Experimental Site for geologic research. This paper based on the national project 973-"Several Kinds of Energy Mineral Concurrent And Accumulation Mechanical And Deposit Distribution"(2003CB214600), and got the recognitions through the research on Ordos Basin Energy Mineral Geochemical characters as follows:1. Ordos Basin was rich in coal, oil, gas, sandstone-type uranium deposit and other energy resources. On vertical, coal accumulated in the Perm-Carboniferous and Jurassic, oil and uranium deposited mainly in the Jurassic, and gas reservoir in the Ordovician and Permian. On horizontal, oil was located in the center and southern of the basin, uranium located in the edge, gas and coal were distributed the entire basin. In the process of the basin evolution, different types of energy overlaid on different tectonic units, including coal, gas and uranium combination, coal and gas combination, coal, oil and gas combination, and coal, oil, gas and uranium combination.2. Through the GC-MS analysis, Kerogen elements and biomarker compounds analysis, showed there was other high maturity degree organic matter (oil and so on) to intervene and more serious biodegradable in the purpose ore layer, and noted that in the process of uranium mineralization, the role of organic was obvious.3.Trace elements displayed different geochemical characteristics in the horizontal and vertical of the basin, siderophile elements showed enrichment in Dongsheng District and poor in Zhenyuan District. Rare-earth elements analysis showed that heavy and light rare-earth elements medium fractionation, and there was strong fractionation among the light rare-earth elements.4. Uranium enrichment had the close relationship with the deep organic fluid and organic. Organic, microbial and bacteria played an important role in the process of sandstone-type uranium deposits. Organic played a role of reduction, adsorption, cation exchange and coordination and microbial main played a role of absorption and reduction in the process of uranium enrichment.