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地球学报  2004 

胶东蓬莱河西金矿床铅、硫同位素地球化学特征

Keywords: 铅、硫同位素,物质来源,蓬莱河西金矿,胶东

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Abstract:

蓬莱河西金矿位于胶东三大金矿带中的栖蓬金矿带内,金矿体受NE向断裂构造控制,赋存围岩既有花岗岩也有胶东群变质岩,特别是郭家岭花岗闪长岩的内外接触带,金矿化更为富集。矿石以含金石英脉型为主。对该矿床S同位素研究表明,δ^34S值为7.4‰~8.5‰,平均值为7.8‰。矿石Pb同位素组成^206Pb/^204Pb为17.3086~17.4799,^207Pb/^204Pb为15.5264~15.5692,^208Pb/^204Pb为38.0973~38.3698;与矿区出露的煌斑岩脉的铅同位素组成十分相近,而与赋矿围岩郭家岭花岗闪长岩的铅同位素组成不同。研究表明,该矿床的成矿物质可能部分来自幔源,具有与玲珑、焦家等超大型金矿类似的特征。

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