吴亚飞;曾键年;曹建劲;吴政权;陈津华;周树达;陆顺富;李小芬;

• 1:中国地质大学资源学院
• 2:中山大学地球科学系
• 3:浙江省地质调查院
• 4:中国地质大学地球科学学院

摘要(Abstract)：

东升庙岩体位于华北板块北缘西段,岩性主要为白云母二长花岗岩。采用LA-ICPMS锆石U-Pb微区定年和锆石微量元素及Hf同位素分析方法,对该岩体进行了系统的研究。花岗岩中几乎所有的锆石都显示典型的韵律振荡环带,Th/U比值较高(均大于0.1),锆石稀土元素球粒陨石标准化配分曲线呈左倾型,并显示明显的正Ce异常和负Eu异常,表明这些锆石为岩浆成因。测年结果显示,东升庙岩体形成年龄为(259.4±3.3)Ma,代表成岩年龄,属海西晚期侵入岩;部分核部继承锆石年龄加权平均值为(2 367±63)Ma,提供了该区古元古代结晶基底的年龄信息。锆石具有较均一的Hf初始比值,176 Hf/177 Hf介于0.282 125~0.282 362之间,εHf(259Ma)值为较低的负值(-17.3~-9.0),两阶段Hf模式年龄tDM2为1.91~2.11Ga,指示东升庙岩体起源于古元古代古老地壳部分熔融。对该岩体的综合研究有助于进一步认识和研究华北板块北缘的构造演化过程。

关键词(KeyWords)： 东升庙花岗岩体;年代学;Hf同位素;岩石成因;华北板块

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(41030425)

作者(Author): 吴亚飞;曾键年;曹建劲;吴政权;陈津华;周树达;陆顺富;李小芬;

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