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矿床地质  2011 

西藏谢通门县邦弄含铁电英岩脉的地质特征及成因分析

Keywords: 地质学,含铁电英岩脉,地质特征,氢、氧同位素,成矿流体,谢通门

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Abstract:

文章介绍了西藏谢通门县邦弄地区含铁电英岩脉的地质特征。电英岩脉的延伸方向大致与区内的断层平行,围岩为中粒斑状角闪黑云二长花岗岩。电英岩脉中见有不同程度的铁矿化,共有23条矿化较好的含铁电英岩脉。含铁电英岩脉中矿石矿物为赤铁矿(镜铁矿),脉石矿物为石英、电气石及少量的白云母和长石。矿石具叶片状、鳞片状结构,块状构造,矿石类型为致密块状、浸染状、细脉状。氧同位素测试表明,5件样品的δ18Ov-smow平均值为6.8‰,氢-氧同位素组成图显示,成矿流体以大气水为主,但岩浆流体可能也对矿床的形成起了重要作用。

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