中蒙边界亚干变质核杂岩糜棱状花岗岩的构造特征——对核杂岩运动学、年代学的限定意义

被引:5
作者
王涛
郑亚东
李天斌
马铭波
高永军
机构
[1] 北京大学地质系,北京大学地质系,中国地质调查局宁夏地质调查院,北京大学地质系,北京大学地质系北京,北京,银川,北京,北京
基金
中国博士后科学基金;
关键词
糜棱状花岗岩; 组构; 同伸展构造; 亚干;
D O I
暂无
中图分类号
P588.3 [变质岩];
学科分类号
摘要
糜棱状花岗岩是研究核杂岩运动学、动力学和年代学的理想标志体.它们呈线型平行主期伸展面理展布,去应变后,初始形态轴比也近席状.岩石具典型的S-L和L组构,变形类型以单剪为主,纯剪次之.多种剪切标志指示上盘向南南东剪切,反映了核杂岩的运动学特点.不同岩体变形强弱差异有别,但面线产状一致,显示了递进的韧性剪切作用,其组构发育机制具有(亚)岩浆流动机制→高温固态流动→中低温固态流动连续过渡特点.上述特征显示,该类岩体是同伸展构造早期岩体的可能性较大.结合年代学研究,揭示该区在早中生代中下地壳可能发生伸展变形.
引用
收藏
页码:96 / 100
页数:5
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