松辽盆地南部新生代辉绿岩及其与砂岩型铀成矿的关系

doi:10.13278/j.cnki.jjuese.20230123

Abstract

Abstract: In recent years, large and medium-size uranium deposits such as Qianjiadian, Baolongshan and many uranium minings have been discovered through uranium exploration in the southern Songliao basin. Diabase is widely developed in the uranium ore concentration area, mainly distributed around the uranium deposit, near the oxidation fronts of Yaojia Formation, exhibits a spatial correlation with uranium mineralization. While the relationship between diabase and uranium mineralization remains debated, core observation, microscopic identification, and fluid inclusion analysis suggest a significant hydrothermal influence of diabase on uranium mineralization. The microscopic identification shows brannerite formed at a higher temperature and metasomatized the early ilmenite, filling along the fissures, and co-existing with automorphic pyrite, revealing that the formation of uranium deposits in southern Songliao basin may be superimposed on the factors of late magmatic hydrothermal activity. Fluid inclusion studies yield an average temperature of 115.7 ℃, characterizing the ore fluid as low-temperature hydrothermal, exceeding the temperature of uranium-containing oxygen-containing fluids (24.5 ℃) in Yaojia Formation oxidation zone. The inclusion salinity distribution shows low, medium, and high salinity areas (three intervels), representing three distinct fluid activity periods. Combining the existing chronology, geochemistry and exploration results, the uranium mineralization in the southern Songliao basin is divided into four stages: primary preconcentration (96.0-87.0 Ma), uranium-containing and oxygenated water infiltration mineralization (67.0-53.0 Ma), hydrothermal superimposition and reworking (43.0-37.0 Ma), and interlayer oxidation continuous superimposition (17.0-0.7 Ma). Notably, the hydrothermal superimposition period (43.0-37.0 Ma) coincides with the major intrusion age (49.4-39.1 Ma) of diabase.

Key words: , uranium mineralization, diabase, hydrothermal transformation, fluid inclusions, southern Songliao basin

CLC Number:

P619.14

Wang Changdong, Hao Xiaofei, Yang Dongguang, Ning Jun, Weng Haijiao, Yan Zhaobin, Zhang Shaohua, Wu Fei. Cenozoic Diabase and Its Relation to Metallization of Sandstone Type Uranium Deposit in Southern Songliao Basin[J].Journal of Jilin University(Earth Science Edition), 2025, 55(3): 775-788.

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Cenozoic Diabase and Its Relation to Metallization of Sandstone Type Uranium Deposit in Southern Songliao Basin

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