【摘要】：為確定芨嶺鈾礦成礦流體的性質(zhì),對成礦期碳酸鹽脈開展了詳細(xì)的流體包裹體研究。包裹體巖相學(xué)和顯微測溫結(jié)果表明,碳酸鹽脈主要發(fā)育氣相包裹體、液相包裹體和純液相包裹體;包裹體均一溫度為141~295℃(峰值分別為170~180℃、240~250℃),鹽度為2.09%~7.69%Na Cleqv(峰值5%~6%NCleqv),屬于低-中溫、低鹽度鈾礦床。激光拉曼和群體包裹體成分分析結(jié)果顯示:成礦流體氣相成分以CH_4、H_2為主,H_2S、N_2、CO_2次之,液相成分富H_2O和CH_4,成礦流體屬于NaCl-H_2O±CH_4±CO_2體系。結(jié)合C、O同位素組成,δ~(13)C_(VPDB)值在-1.50‰~-6.33‰之間,δ~(18)O_(SMOW)值為-2.577‰~5.051‰,成礦熱液的水源主要為巖漿熱液與大氣降水混合特征,且以大氣降水形成為主。結(jié)合成礦流體特征,流體不混溶或沸騰作用導(dǎo)致相分離產(chǎn)生鈾沉淀,以及流體脫氣(CO_2)作用導(dǎo)致鈾礦質(zhì)沉淀、富集,是芨嶺鈾成礦的主要成因。
[Abstract]:In order to determine the properties of ore-forming fluids in Jieling uranium deposit, the fluid inclusions of carbonate veins in metallogenic period were studied in detail. The results of petrography and microthermometry indicate that the carbonate veins are mainly composed of gas inclusions, liquid inclusions and pure liquid inclusions. The homogenization temperature of inclusions is 141 ~ 295 鈩，

本文編號：2363281