大巴山国家地质公园构造地貌景观构造变形期次研究

  本文关键词：大巴山国家地质公园构造地貌景观构造变形期次研究，，由笔耕文化传播整理发布。

大巴山国家地质公园构造地貌景观构造变形期次研究

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1成都理工大学数学地质四川省重点实验室;成都理工大学信息管理学院;成都理工大学地球物理学院;中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室;四川省建筑职业技术学院;成都理工大学沉积地质研究院;

通过野外路线考察,典型地区填图,地质、地形图判读发现,大巴山国家地质公园主要构造地貌景观横向分布呈现由NE至SW即从造山带向前陆盆地方向逐渐减弱特征;纵向上明显受早期构造格局和岩石类型约束,在区域上呈现NW—SE向延展的平行岭谷地貌,山峰和谷地的走向与地质构造线基本一致。通过对主要构造地貌景观构造应力和变形期次判别探讨,确定构造地貌景观形成的构造期次大致为三期,应力主要来自于NE—SW、SE—NW向,反映该区不仅受到NE—SW向的冲断挤压变形作用,还受到SE—NW向的右旋剪切挤压变形作用,推测是由多期受力叠加改造而成。通过ESR及14C定年确定距今12 Ma以来,该区在500 kaBP、278 kaBP、29 kaBP分别出现三次规模较大的快速抬升运动,提供了与其构造景观形成密切相关的新构造运动年代学证据。

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语种： 中文   

基金：中国地质调查局科技外事部基础研究计划项目(编号:1212011220902)资助

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  本文关键词：大巴山国家地质公园构造地貌景观构造变形期次研究，由笔耕文化传播整理发布。