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矿床地质  2011 

安徽姚家岭锌金多金属矿床地质特征与浅部矿化流体包裹体研究

Keywords: 地球化学,浅成热液矿床,流体包裹体,姚家岭,安徽

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Abstract:

姚家岭锌金多金属矿床是铜陵矿集区近年来新发现的一处大型矿床。该矿床可分为2个成矿期,早期为铜(金、锌)矿化,晚期为锌(金银)多金属矿化,以后者为主。多金属硫化物期以大量发育多种不规则脉状和角砾状矿石为特征,发育硅化、绿泥石化和高岭土化,矿化受张性构造控制,矿物组合为富铁闪锌矿、黄铁矿、黄铜矿、方铅矿、石英(包括玉髓和蛋白石)、方解石、萤石、高岭石、绿泥石等,成矿流体发生多期脉动。流体包裹体显微测温显示成矿流体为中低温(167~404℃,众值区间240~280℃)、中低盐度〔w(NaC1eq)0.66%~13.62%,众值区间2%~4%〕流体,均一压力主体<11MPa,以静水压估算成矿深度在潜水面以下1km左右或略深;蚀变矿化和流体包裹体研究揭示姚家岭矿床以多金属硫化物期矿化为主,应为浅成热液型锌(金银)多金属矿床。

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