Influence of Alkali Metasomatic Mineralization on Liushuwan Uranium Deposit in Lushi Wulichuan Area,West Henan Province
In order to discuss the mineralization of the Liushuwan uranium deposit in the Lushi Wulichuan area,West Henan Province,whose distinct alkali metasomatic mineralization has direct directive significance for a new round of prospecting strategic action in West Henan metallogenic belt.Therefore,it tests Huichizi pluton and exteral granitic pegmatite by petrology,petrochemistry,isotope zircon,muscovite,molybdenite incasing the granitic pegmatite by LA-ICP-MS U-Pb,Ar-Ar and Re-Os to find their linkage to uranium mineralization.It is recognized that the alkali metasomatism of mantle-derived fluids records the uranium mineralization.In Early Paleozoic,mantle derived alkaline magma invaded,melted and metasomatized the Mesoproterozoic Qinling microblocks to produce the uranium-bearing I-type Huichizi pluton(429.4±5.3 Ma)and granitic pegmatite(418.7±2 Ma),which accumulates uranium sources and served as a carrier for uranium ore.Post the formation of the granitic pegmatitte,fluid derived mantle continuously intruded and alkali metasomatised the Qingling Group,the Huichizi pluton and the pegmatite,which could alter their contents including K+Na,SiO2,REE,Zr,Hf,Ti,etc.In that case,the U-Pb,Ar-Ar and Re-Os isotopic closed systems respectively for zircon,muscovite and molybdenite would be broken.Two types of uranium-bearing hydrothermal fluids,respectively Na-Zr-Hf rich and K-Nb-Ta rich,mantle derived magma successively metasomatized the peripheral pegmatite of the Huichizi pluton to contribute the final formed Liushuwan granitic pegmatite uranium deposit.In summary,the mantle derived magma induced alkali metasomatism is the fundamental factor to contribute the spatial allocation of the Liushuwan uranium deposit,the Huichizi pluton and the granitic pegmatite.The uranium-bearing hydrothermal solution derivated from the mantle-sourced magma is the direct factor to the uranium mineralization.The alkali metasomatism destroyed the geochemical signature and isotopic system of the Huichizi pluton and the granitic pegmatite.Uranium-bearing hydrothermal solution is the direct factor of uranium mineralization in Liushuwan uranium deposit.The understanding of alkali metasomatism induced uranium mineralization in Lushi Liushuwan West Henan,not only provides a new perspective for studying the mechanism of granitic pegmatite-type uranium mineralization,but also shed insights on predicting uranium mineralization and expanding the scope for prospecting.
Lushi of West HenanLiushuwan uranium depositpetrochemistryisotopic datingalkali metasomatic mineralizationore deposit geology
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