Fluid Characteristics and Mineralization Process of Cryptoexplosive Breccia-Type Li-Rb Ore Body in Weilasituo Deposit,Inner Mongolia
Three main types of ore bdies are well developed in the Weilasituo deposit,including alkaline granite type Sn-Rb ore body,cryptoexplosive breccia-type Li-Rb ore body,and quartz vein type Sn ore body.The cryptoexplosive breccia-type ore body was located between the other two types of ore bodies and was assumed as the key point to understand the process and genesis of the cryptoexplosive breccia-type ore body.This contribution mainly focuses on quartz crystals and fluid inclusions therein from the cryptoexplosive breccia-type ore body.Through quartz cathodoluminescence imaging,fluid inclusion microthermometry,laser Raman spectroscopy,and in situ oxygen isotope analysis,it tries to address the relationship between fluid evolution and Li-Rb mineralization.Three stages(Q1,Q2,and Q3)of crystallization have been identified based on quartz CL imaging,while Q1 and Q2 are well-developed and closely related to Li-Rb mineralization.Fluid inclusions in Q2 exhibit similar salinity but lower homogeneous temperatures than those in Q1.The oxygen isotope composition of Q2 is lighter than that of Q1.Combined with previous and our study results,it is assumed that the cryptoexplosive breccia-type mineralization of Weilasituo should be formed by cryptoexplosion of volatile which converges on the top of mineralized porphyry,and the mixing of magmatic-hydrothermal fluid and meteoric water might control the precipitation process of zinnwaldite,and eventually form the cryptoexplosive breccia-type Li-Rb mineralization of Weilasituo.
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