合肥盆地伸展方向的演变及其动力学机制

被引:61
作者
朱光
朴学峰
张力
张必龙
陈印
胡召齐
机构
[1] 合肥工业大学资源与环境工程学院
关键词
合肥盆地; 沉积格局; 正断层; 应力场; 华北克拉通破坏; 动力学背景;
D O I
10.16509/j.georeview.2011.02.007
中图分类号
P542 [构造运动];
学科分类号
070904 ;
摘要
本文通过白垩纪—古近纪期间合肥盆地沉积格局、断层活动性、同火山活动正断层、岩脉展布方位、盆缘断层运动学与断层擦痕应力场反演等多方面的综合分析,对伸展方向的演变进行了详细的研究。研究结果表明,早白垩世早—中期为NWW—SEE向拉伸,早白垩世晚期为NW—SE向拉伸,而晚白垩世至古近纪期间为近南北向拉伸。通过对比太平洋区大洋板块运动方向发现,早白垩世早—中期伊佐奈歧板块向NWW向运动,而早白垩世晚期转变为向NNW向运动,晚白垩世至古近纪期间出现的太平洋板块总体上是向正北运动,同样显示为顺时针的转变。两者演变规律的耦合,表明华北克拉通东部的破坏是发生在弧后拉张的动力学背景下。这一弧后大陆边缘的拉伸方向随着大洋板块运动方向的改变而变化,可能是海沟后退方向的改变具体驱动了弧后大陆边缘拉伸方向的改变。
引用
收藏
页码:153 / 166
页数:14
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