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太行山南段平顺杂岩体成因:岩石学、年代学和地球化学证据

, PP. 454-459

Keywords: 平顺杂岩体,太行山南段,岩石成因,锆石U-Pb年龄,华北克拉通

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Abstract:

太行山南段平顺杂岩体主要由橄榄角闪辉长岩,角闪辉长-闪长岩和闪长岩组成,锆石SHRIMPU-Pb测年显示,橄榄角闪辉长岩体和闪长岩体年龄分别为123.4±1.7Ma和125.3±2.3Ma,说明岩体形成于早白垩世。平顺杂岩体SiO2含量介于42.82%~63.54%之间,以高Mg#,富Na,高Sr、Cr、Ni,以及富集LILE、LREE,亏损HFSE、HREE为特点,并具有相对低的87Sr/86Sr初始比值和明显偏低的εNd(125Ma)值,表明岩浆具有壳幔双重属性。结合辉长岩中地幔包体已有的研究成果,认为辉长岩是由富硅流体交代的亏损地幔橄榄岩经低程度部分熔融形成;高Mg闪长岩起源于下地壳部分熔融,并与一定规模的幔源岩浆发生混合;角闪辉长-闪长岩形成于辉长质岩浆与高Mg闪长质岩浆的混合作用。

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