华北克拉通1.75Ga基性岩墙群特征及其研究进展

被引：22

作者：

胡俊良 ^{[1
]}

赵太平 ^{[1
]}

陈伟 ^{[1
]}

彭澎 ^{[2
]}

机构：

[1] 中国科学院广州地球化学研究所

[2] 中国科学院地质与地球物理研究所

来源：

大地构造与成矿学 | 2007年 / 04期

关键词：

华北克拉通; 175Ga; 基性岩墙群; 地幔柱; 碰撞后;

D O I：

10.16539/j.ddgzyckx.2007.04.005

中图分类号：

P588.124 [];

学科分类号：

070901 ;

摘要：

基性岩墙群是地壳伸展背景下,来自地幔的基性岩浆侵入体。华北克拉通同世界上其它克拉通一样,广泛发育前寒武纪基性岩墙群。它们在不同时代均有产生,其中1.75Ga前后的规模最大,分布范围最广,几乎遍布整个克拉通,对其进行深入研究,可以揭示华北克拉通该期构造演化过程。华北克拉通1.75Ga前后的岩墙几何形态多变,直立或近直立,走向主要为NNW向和近EW向。岩石以拉斑玄武质岩类占绝对优势(>80%),主要造岩矿物为单斜辉石和斜长石。根据岩墙走向、岩浆分异程度和岩石地球化学特征可将其分五组:低分异LT组、低分异HT组、高分异NW组、高分异EW组,以及具明显差异的高铁系列。同位素和微量元素研究显示,岩浆源区主要与富集Ⅰ型地幔(EMⅠ)、弱亏损的常规地幔(DM-PREMA)以及陆下岩石圈地幔有关。目前对华北克拉通1.75Ga基性岩墙群产出的构造环境在认识上有分歧,其中地幔柱观点和碰撞后伸展观点最为人们所关注。

引用

页码：457 / 470

页数：14

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