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矿床地质  2010 

河北小寺沟铜钼矿埃达克岩:年龄、地球化学特征及其地质意义

Keywords: 地球化学,埃克达岩,斑岩,年龄,小寺沟,河北

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Abstract:

小寺沟斑岩型铜钼矿产于华北板块北缘,其主体岩体类型为英云闪长岩和二长花岗岩类,矿物组合为斜长石+角闪石+石英+钾长石±黑云母±辉石+不透明矿物,岩性为钙碱性I型侵入岩。K_Ar法测得小寺沟岩体花岗斑岩年龄为(122.83±2.46)Ma。岩石主量元素具有高SiO2、Al2O3、Na2O、Mg#,低K2O、TiO2、MgO、CaO、P2O5特征。稀土元素具有负Eu异常不明显,低HREE和Y,轻、重稀土元素强烈分异特征。研究认为,小寺沟岩体与埃达克岩相似,其初始岩浆主要为加厚下地壳的部分熔融产物,即小寺沟埃达克岩为C型埃达克岩,其初始岩浆中可能还有部分地幔物质。小寺沟大型斑岩型铜钼矿的形成与埃达克岩的成矿专属性、华北板块北缘特殊构造环境密切相关。

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