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某铀矿床位于L花岗岩体外接触带,成矿围岩为中泥盆统碳酸盐岩,为多阶段中低温热液型铀矿化。本文详细地讨论了该矿床的成矿物理化学条件:成矿温度为100—300℃,沥青铀矿形成温变为150—200℃;矿前期热液压力为(1—2)×10~8SPa,矿期为(5—10)×10~7pa,矿后期为(3—5)×10~7Pa。从矿前期至矿后期,矿液fo_2和fs_2皆有降低的趋势fo_2为10~(-31.81)—10~(43.58),fs_2为10~(-6.67)—10~(-16.56);矿液pH为7.12—7.59,Eh为-0.2702—-0.2848V;铀以K_4[UO_2(CO_3)_3]形式迁移,随着物理化学条件的改变,铀络合物解体,形成沥青铀矿。
A uranium deposit is located in the in-vitro contact zone of L granite, and the metallogenetic surrounding rock is of the Middle Devonian carbonate rock, which is a multi-stage middle-low temperature hydrothermal uranium mineralization. This paper discusses in detail the metallogenic physicochemical conditions of this deposit: the temperature of formation is 100-300 ℃, the temperature of formation of uraninite is 150-200 ℃, the hydrothermal pressure is (1-2) × 10-8SPa, The ore period is (5-10) × 10 ~ 7pa, and the post-ore period is (3-5) × 10 ~ 7Pa. From the pre-mine to post-mine period, fo_2 and fs_2 all decreased, fo_2 was 10 ~ (-31.81) -10 ~ (43.58), fs_2 was 10 ~ (-6.67) -10 ~ (-16.56) The pH value was 7.12-7.59 and the Eh was -0.2702--0.2848V. The uranium migrated as K_4 [UO_2 (CO_3) _3]. As the physical and chemical conditions changed, the uranium complexes disintegrated to form uraninite.