Uranium mineralization related to mantle fluid: A case study of the Xianshi deposit in the Xiazhuang uranium orefield;

Mantle fluids in supercritical state possess high dissolving and diffusing capacity,which are the important transporting carrier of energy in earth interior,their chemical compositions vary in a large range with the evolution processes of mantle,and can be distinguished as the primitive fluid in upper mantle,the fluid of mantle metasomatism and etc.

Pb,Sr isotopic data of crude oil and organic matter show that in the Liaohe oilfield, only a little of crude oil is related to organic matter, most of crude oil is generated by crust mantle interaction between mantle fluids and Palaeozoic and Sinian marine carbonate rocks, the other major crude oil is formed by Fischer Tropsch synthesis of mantle fluids.

In this paper, the distribution, abundance and occurrence states of U in mantle xenoliths are studied by ~(235)U fission track method, and the movement of mantle fluids is revealed by means of U-tracer, which is a representative of incompatible elements in the mantle.

Results of the recent research show that volcanic-type and granite-type uranium deposits have both early and late phases of uranium mineralization,and the early phase uranium mineralization is characterized by metallogenetic features of mantle fluids.

The oil and gas resources in basin and mountain system emerge from the activity period of basalt magma under the effect of the mantle fluids.