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地球学报  2003 

大青山晚白垩世以来的隆升历史

Keywords: 大青山,裂变径迹,夷平面,山脉隆升

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Abstract:

根据以裂变径迹年龄为主的热年代学方法和大青山地形剖面和盆地沉积资料分析,认为大青山地区侏保罗世发生大型板内挤压变形之后在晚白垩世进入伸展构造控制的构造活动阶段。在伸展背景下,大青山主要经历了晚白垩世整体隆升—剥蚀和始新世以来的造山带伸展裂解引发的差异升降—剥蚀过程。造成大青山约6km的剥蚀量。在大青山伸展、塌陷、裂解过程中由于山—盆间的阶段性差异升降运动形成了大青山中的四期夷平面和其下的山前侵蚀台地以及邻区盆地沉积体系中的相对应的多期沉积间断。最终形成大青山地区现今盆—山构造—地貌格局。控制山脉隆升的大青山山前正断层始新世以来的平均活动速率为0.2—0.3mm/a。

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