新甘交界红柳河地区二叠纪玄武岩年代学、地球化学及构造意义

被引：31

作者：

潘金花

郭召杰

刘畅

赵泽辉

机构：

[1] 造山带和地壳演化教育部重点实验室北京大学地球与空间科学学院

来源：

岩石学报 | 2008年 / 24卷 / 04期

关键词：

北山; 红柳河; 玄武岩; 岩石地球化学; 激光Ar-Ar定年;

D O I：

暂无

中图分类号：

P588.145 [];

学科分类号：

摘要：

新甘交界红柳河地区二叠系剖面中发育有块状和枕状玄武岩,激光ArAr定年确定的玄武岩形成时间在280～300Ma之间;玄武岩SiO2含量为44.71%～49.27%,Mg#为42.4～52.4,(87Sr/86Sr)i为0.703834～0.706819,(143Nd/144Nd)i为0.518861～0.5121220,εNd（t）为-3.01～3.67。玄武岩微量元素、稀土元素和Sr-Nd同位素均显示出与OIB性质相似的特征。其弱富集的不相容元素和轻稀土元素,显示出源区富集的特点。而Zr/Nb（14.63）和Th/U（2.83）则指示岩浆中可能有少量循环原始地幔和亏损地幔物质的加入。综合对比北山南部柳园地区二叠纪玄武岩源区特征,提出红柳河地区早二叠世OIB型玄武岩主要来源于北山地区晚古生代裂谷带下伏已被不同程度改造的富集地幔。

引用

页码：793 / 802

页数：10

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