Characteristics of volcanic rock geochemistry and relationship with uranium mineralization in the Daqingshan basin, Manchuria, Inner Mongolia

The geochemical characteristics of volcanic rocks in Mesozoic Daqingshan show high SiO₂, K₂O and LILE, and low CaO, Mgo and HFSE, which belong to the calc-alkaline series, supersaturated total REE enrichment. The rocks originated from mantle wedge, and attributed to the crustal contamination during the magmas. The Mesozoic volcanic rocks experienced from tensional to shear-compression background, resulting in the decompression melting of the pre-existent metasomatized lithosphere mantle. Based on petrochemical characteristics and uranium mineralization, the Mesozoic volcanic rocks are similar with the adjacent, which present the final progress in volcanic rock-type uranium prospecting in this area. (authors)