Trace Elements and Sulfur Isotopes Characteristics of Pyrite in Hailijin Uranium Deposit and Their Implications to Ore-forming Properties,Songliao Basin
The ore-controlling gray sandstones of Hailijin uranium deposit are surrounded by oxidized sandstones on vertical,the ore body are in multi-stratiform and tabular shape,which is quite different from the traditional sandstone type uranium deposit of interlayer oxidation.In this paper,the characteristics of trace elements and sulfur isotopes of pyrite in the ore-bearing gray sandstones were collected to study the properties and sources of ore-forming fluid in Hailijin uranium deposit,the following understandings were obtained:1)Pyrite in ore-bearing layer of Hailijin uranium deposit mainly occurs in colloidal,framboid and granular forms,and the uranium minerals are often associated with colloidal or framboid pyrite in the organic cell cavity or intergranular pores of minerals.2)The characteristics of trace elements in pyrite show that the content of sulfurophilic elements such as As,Mo and Sb increases from the core to the edge,and Mo,Ni,Zn,Cu and Ba show a better positive correlation with U.These elements are generally difficult to precipitate and enrich in atmospheric precipitation,comparatively,they're enriched in deep reducing fluids generally.The δ34SV-CDT value of sulfur isotope shows a significant decrease from the core to the edge,indicating that the pyrite formation environment has changed greatly.It is suggested that the ore-forming fluid of Hailijin uranium deposit may derives from deep reducing fluid with a certain temperature.3)The uranium-rich hydrocarbon source rocks with large thickness and wide area are occurred in the southwest Songliao Basin,and the F1 fault in the southeast of Hailijin uranium deposit connected the deep uranium-rich hydrocarbon source rocks and ore-bearing layers.Therefore,it was believed that the ore-forming fluid of Hailijin uranium deposit may originated from the deep reducing fluid(uranium-rich hydrocarbon source rocks),and the ore-controlling gray sandstone was the reduction transformation of the primary oxidized sedimentary formation by the reducing fluid.
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