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地球学报  2001 

新疆天山(独山子)—西昆仑(泉水沟)地学断面地震与重力联合反演地壳构造特征

Keywords: 新疆地学断面,地壳构造,天山,塔里木盆地,西昆仑

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Abstract:

利用滑动平均的布格重力异常剖面结合地震资料和大地电磁资料,参考介质纵波速度与密度的经验转换关系,通过二维均匀介质模型人机交互式计算得了新疆天山(独山子)-西昆仑(泉水沟)地学断面走廓域中心剖面的地壳构造特征。所得的反演结果表明,准噶尔盆地与北天山地体,中天山地体为一整体;准噶尔盆地和天山构造带的中、下地壳之间存在低密度层,但塔里木盆地不存在低密度层;由于受到南北两侧板块挤压,造成塔里木盆的地地壳结构在横向上似一南陡北缓,中部隆起的不对称“拱形”弯曲;塔里木盆地南缘与西昆仑构造带间呈“V型盆山耦合关系”,其下方恰好是莫霍面上隆区。

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