松辽盆地砂岩型铀矿床的热液作用特征——以宝龙山地段砂岩铀矿为例

Features of Hydrothermal Alteration of Sandstone-type Uranium in Songliao Basin——A Case of Study in Sandstone-type Uranium Deposit of Baolongshan Section

松辽盆地宝龙山地段砂岩型铀矿床的热液蚀变极为发育,常见高岭石化、碳酸盐化、黄铁矿化、赤铁矿化和水云母—绢云母化等蚀变类型,以低温热液蚀变为主,呈现多期次、脉动性特点。铀矿物与热液蚀变矿物紧密共生,表明铀成矿作用与热液活动密切相关。初步分析,基性岩浆活动是促使热液作用的动因,有利的构造条件为热液作用提供了活动空间。

The hydrothermal alterations are very common of sandstone-type uranium d in Songliao basin, such as kaolinization, carbonation, pyritized, hematization, hydro Most are low temperature and they are mutual superposition, and presen the chara eposit of Baolongshan section mica -sericitization an so on. cteristics of muhi-stages and pulsation. The uranium minerals coexist closely with altered minerals, and it indicates that uranium mineralization is closely related to hydrothermal process. Prelinfinary analysis, basic magmatism have urged the hydrothermal alteration, and favorable structural environment have offered passage for hydrothermal alteration.