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地质学报  2007 

新疆北部晚古生代的底侵作用――来自橄榄玄粗岩与埃达克岩的证据

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Keywords: 底侵作用,橄榄玄粗岩系火山岩,埃达克岩,晚古生代,新疆北部

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Abstract:

新疆北部广泛分布晚古生代橄榄玄粗岩系火山岩和埃达克岩,它们均明显富碱,与区内同时代碱性花岗岩共同构成新疆北部富碱火成岩省。橄榄玄粗岩系火山岩和埃达克岩同位素年龄为250-280Ma,143Nd/144Nd比值高,εNd(t)值为正值,Nd模式年龄低(tDM<1.0Ga),较低而变化范围较大的(87Sr/86Sr)i(0.7040-0.710),这些特点均表明它们的源区物质为底侵幔源玄武质岩浆,并可能受到下地壳混染。结合区内地球物理资料,如加厚的地壳、复杂的莫霍面结构、高热流值及广泛分布的基性岩墙群和碱性花岗岩,均一致表明在晚古生代(晚石炭-二叠纪)新疆北部发生过较广泛的幔源玄武质岩浆底侵作用,陆壳发生了明显垂向增生。

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