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矿床地质  2003 

甘肃辉铜山铜矿床燕山期钾长花岗岩的发现及其地质意义

Keywords: 地球化学,40Ar/39Ar测年,钾长花岗岩,夕卡岩型铜矿床,辉铜山,甘肃

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Abstract:

文章对辉铜山铜矿床内的钾长花岗岩进行了岩石化学分析、钕同位素测量和高精度的40Ar/39Ar法年龄测定。结果表明,钾长花岗岩的形成时代为(192±3)Ma,相当于燕山早期,它们具有A型花岗岩的特征;成岩物质来自地幔,并遭受了地壳物质的混染。岩浆侵位可能与本区在燕山早期发生的陆内伸展有关。

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