冀东晚古生代东湾子岩体的岩石成因研究

被引：15

作者：

马旭

陈斌

牛晓露

机构：

[1] 北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室

来源：

岩石学报 | 2009年 / 25卷 / 08期

关键词：

东湾子岩体; 晚古生代; 堆晶; 活动大陆边缘; 华北板块;

D O I：

暂无

中图分类号：

P588.124 [];

学科分类号：

070901 ;

摘要：

冀东晚古生代东湾子岩体由角闪石岩、少量辉石岩和辉长岩组成。典型的堆晶结构、全岩和镁铁质矿物（透辉石、角闪石）的上凸型稀土分布模式、相容元素含量低且变化范围大(如:角闪石岩中V=296×10-6～673×10-6)的特征表明了岩体的堆晶成因。计算得到的与辉石岩中的透辉石相平衡的熔体具有很高的稀土含量,轻重稀土分馏较为明显,富集大离子亲石元素（如:Sr,Ba,K）,亏损高场强元素（如:Nb,Zr,Ti）,具有典型的弧岩浆特征。透辉石和角闪石的矿物成分也具有弧岩浆的特征。高钙透辉石、大量的角闪石与黑云母的存在说明母岩浆富水。透辉石在高PH2O的状态下与熔体反应,生成角闪石的结构特征也证明了这一点。结合岩体的球化学特征,认为岩浆来源于富集的含有角闪石的尖晶石橄榄岩的部分熔融,母岩浆具有富水的特征（>3%）。考虑到岩体形成时代（～300Ma;Zhao et al.,2007）和地质背景,认为东湾子岩体与位于华北北缘的其它晚石炭-早二叠世的岩体形成于同一构造背景下,都是晚古生代时期古亚洲洋向华北板块之下俯冲的产物。

引用

页码：1975 / 1988

页数：14

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