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地质通报  2005 

龙门山均衡重力异常及其对青藏高原东缘山脉地壳隆升的约束

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Keywords: 青藏高原东缘,龙门山均衡重力异常,重力均衡,地壳隆升

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Abstract:

青藏高原东缘处于不均衡状态,自西而东可分为青藏高原弱负均衡重力异常区、龙门山正均衡重力异常区和四川盆地负均衡重力异常区,表明该区的不均衡状态并未导致Airy均衡运动的产生,即龙门山没有均衡下降,而处于不断的隆升状态,显示该地区反均衡运动的构造抬升是导致龙门山隆升的主因。本次采用似三度体重力异常计算方法对该区的正均衡重力异常进行模拟和反],研究了大尺度地貌分异与均衡重力异常分区之间的相互关系,结果表明,龙门山的下地壳顶面抬升了11.2~12.6km,造成了龙门山的正均衡异常,揭示了构造抬升和剥蚀作用在相似的时间尺度上和空间尺度上控制着龙门山地貌的形成,龙门山的表面隆升是构造隆升和剥蚀作用相叠加的产物。

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