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华北克拉通地壳结构区域差异的接收函数研究

DOI: 10.1007/s11430-015-5162-y, PP. 1504-1514

Keywords: 华北克拉通,Moho面深度,泊松比,重力均衡,接收函数振幅,地壳结构区域差异

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Abstract:

?利用远震数据接收函数H-κ叠加和前人发表的共823个台站下方的Moho面深度与平均泊松比信息,结合地形与接收函数振幅资料,共同约束华北克拉通的地壳结构特征.结果表明华北克拉通古老和改造的地壳共存,与区域地形和地质构造有较好的对应关系.华北东、中和西三块体地壳结构差异明显,整体大致处于重力均衡状态,中西部局部地区和东部均衡度较低.它们的平均Moho面深度分别为33,37和42km,而平均泊松比分别为0.268,0.267和0.264.Moho面深度或泊松比异常主要分布在裂陷区,中部南北缘以及构造边界附近;鄂尔多斯核心表现出典型克拉通性质的Moho面深度和泊松比.三个区域Moho面深度与泊松比都呈现出负相关的关系,但变化趋势存在差异.东、中部北缘接收函数振幅相对较大,裂陷及其邻区振幅相对偏低,燕山带和山西裂陷南侧振幅显示出小尺度变化.上述结果表明,华北东部地壳整体受到破坏减薄,中、西部地壳表现为局部改造.不同区域地壳结构的差异可能反映了华北地壳改造过程和机制的区域差异性:东部地壳整体破坏可能主要由中新生代以来东侧太平洋板块俯冲引起;中、西部地壳局部改造可能是其自身结构和性质的不均匀性在长期演化过程中多次改造活化的叠加效果.

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