华北克拉通南缘中条山-嵩山地区1.78Ga基性岩墙群的地球化学特征及构造环境

被引:82
作者
胡国辉 [1 ,2 ]
胡俊良 [1 ,3 ]
陈伟 [1 ,2 ]
赵太平 [1 ]
机构
[1] 中国科学院广州地球化学研究所
[2] 中国科学院研究生院
[3] 宜昌地质矿产研究所
关键词
基性岩墙群; 地球化学; 岩石成因; 构造环境; 华北克拉通南缘;
D O I
暂无
中图分类号
P588.13 [脉岩、浅成岩(次火山岩)];
学科分类号
070901 [矿物学、岩石学、矿床学];
摘要
幔源岩浆侵位产生的基性岩墙群是地壳伸展裂解的重要标志。华北克拉通南缘中条山-嵩山地区出露有大量的中元古代基性岩墙群,对其研究将有助于深入了解华北克拉通中元古代构造演化特征。其岩石类型以辉绿岩为主,少量辉长辉绿岩和辉绿玢岩;主要造岩矿物为斜长石和单斜辉石,其它矿物包括角闪石、Fe-Ti氧化物、磷灰石、黑云母、碱性长石和石英。锆石SHRIMPU-Pb年龄为1785±18Ma,代表岩墙的结晶年龄。岩石K2O+Na2O含量为3.63%~6.18%,K2O/Na2O比值为0.73~1.38,FeOT含量较高(10.03%~13.59%),属于拉斑玄武岩系列。岩石的稀土元素含量高(142×10-6~381×10-6),亏损Nb、Ta、Zr、Hf等高场强元素,富集Rb、Ba、La等大离子亲石元素,全岩εNd(t)值为-6.2~-8.1。岩墙的固结指数(SI)和MgO含量呈明显的正相关关系,说明幔源岩浆发生过明显的结晶分异作用。地球化学分析表明,研究区基性岩墙属于板内拉斑玄武岩系列,与熊耳群火山岩有相似的地球化学特征;基于两者紧密的产出关系,我们认为该区岩墙可能是熊耳群火山岩的通道岩墙,共同代表了华北克拉通东、西陆块碰撞后伸展事件。
引用
收藏
页码:1563 / 1576
页数:14
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