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地质通报  2002 

中蒙边界中生代推覆―伸展递进转换及地壳尺度的切向剪切

, PP. 232-237

Keywords: 切向剪切构造层次推覆-伸展转换变质核杂岩中生代中蒙边界

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Abstract:

中蒙边界-带发育中生代大型推覆和伸展构造。亚干伸展变质核杂岩从开始形成到最终(早白垩世)成型是一个长期递进发育过程,早期深层次透入性韧性伸展剪切主要发生于170-135Ma,有迹象显示在228-170Ma已经开始。这与中生代推覆事件在时代上重合,且运动指向相同,即上盘均向南东,显示推覆与伸展同时、同向的递进转换。提出地壳尺度切向剪切构造模式:在上地壳近水平简单剪切和水平挤压叠加构成一般剪切而形成推覆;而在中下地壳近水平简单剪切和上下挤压(重力作用)叠加构成一般剪切而发育同向伸展拆离剪切带(C′),随着上地壳的增厚和下地壳的减薄,该伸展剪切带向上扩展形成变质核杂岩。

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