本文選題：秋樹坪金礦 + U-Pb定年��； 參考：《礦物巖石》2017年04期

【摘要】：秋樹坪金礦位于楊子地塊北緣漢南-米倉山隆起的漢南推覆隆起帶。在礦區(qū)內(nèi)采集含金石英脈樣品一件,運用ICP-MS U-Pb鋯石測年方法,獲得熱液鋯石的加權(quán)平均年齡為90.2 Ma±1.5 Ma,為金礦的成礦年齡。含金石英脈內(nèi)繼承鋯石年齡為1 160 Ma±33 Ma,1 746 Ma±23 Ma,與基底火地埡群火山巖年齡相近。采集不同成礦階段的含金石英脈樣品6件,進行成礦流體特征研究。流體包裹體測溫研究,獲得秋樹坪礦床成礦熱液溫度為205.06℃~444.9℃、鹽度為2.88%~7.38%,密度為0.56g/cm3~0.87g/cm~3,具中-高溫、低鹽度、低密度特征。通過激光拉曼光譜分析,流體包裹體氣相成分主要由CH_4,CO_2,H_2S,H_2和N_2組成,液相成分主要為H_2O,CH_4和CO_2;含金石英脈氫氧同位素分析,δ~(18)O_水變化范圍為3.11‰~15.42‰,δD值為-62.4‰~-84.2‰,認為原始成礦熱液為變質(zhì)熱液,后期混入大氣降水,使δ~(18)O_水值大幅下降。結(jié)合成礦流體特征與陸陸碰撞造山運動的構(gòu)造背景,認為秋樹坪金礦為該地區(qū)首次厘定的燕山期造山型金礦。
[Abstract]:Qiusuping gold deposit is located in the Hannan-Micang mountain uplift in the northern margin of Yangzi block. Using ICP-MS U-Pb zircon dating method, the weighted mean age of hydrothermal zircon is 90.2 Ma 鹵1.5 Ma, which is the metallogenic age of gold deposit. The age of inherited zircon in gold-bearing quartz vein is 1 160 鹵33 Ma 鹵1 746 Ma 鹵23 Ma, which is similar to that of volcanic rocks in Huodiya Group, basement. Six samples of gold-bearing quartz veins at different metallogenic stages were collected and the characteristics of ore-forming fluids were studied. The study of fluid inclusion temperature shows that the ore-forming hydrothermal temperature of Qiusuping deposit is 205.06 鈩，

本文編號：1786360