南北构造带北段上地幔各向异性特征

常利军, 丁志峰, 王椿镛. 南北构造带北段上地幔各向异性特征[J]. 地球物理学报, 2016, 59(11): 4035-4047, doi: 10.6038/cjg20161109
引用本文: 常利军, 丁志峰, 王椿镛. 南北构造带北段上地幔各向异性特征[J]. 地球物理学报, 2016, 59(11): 4035-4047, doi: 10.6038/cjg20161109
CHANG Li-Jun, DING Zhi-Feng, WANG Chun-Yong. Upper mantle anisotropy beneath the northern segment of the north-south tectonic belt in China[J]. Chinese Journal of Geophysics (in Chinese), 2016, 59(11): 4035-4047, doi: 10.6038/cjg20161109
Citation: CHANG Li-Jun, DING Zhi-Feng, WANG Chun-Yong. Upper mantle anisotropy beneath the northern segment of the north-south tectonic belt in China[J]. Chinese Journal of Geophysics (in Chinese), 2016, 59(11): 4035-4047, doi: 10.6038/cjg20161109

南北构造带北段上地幔各向异性特征

详细信息
    作者简介:

    常利军,男,1978年生,研究员,主要从事地球深部构造、地震各向异性和地球动力学方面的研究工作.E-mail:ljchang@cea-igp.ac.cn

  • 中图分类号: P315

Upper mantle anisotropy beneath the northern segment of the north-south tectonic belt in China

  • 对布设在南北构造带北段的中国地震科学探测台阵项目二期674个宽频带流动台站和鄂尔多斯台阵21个宽频带流动台站记录的远震XKS(SKS、SKKS和PKS)波形资料作偏振分析,采用最小切向能量的网格搜索法和“叠加”分析方法求得每一个台站的XKS波的快波偏振方向和快、慢波的时间延迟,并结合该区域出版的122个固定台站的分裂结果,获得了南北构造带北段上地幔各向异性图像.快波方向分布显示青藏高原东北缘、阿拉善块体和鄂尔多斯块体西缘的快波方向主要表现为NW-SE方向,秦岭造山带的快波方向为近E-W方向,鄂尔多斯块体内部的快波方向在北部为近N-S方向,南部表现为近E-W方向.时间延迟分布来看,鄂尔多斯块体的时间延迟不仅明显小于其周缘地区,而且小于其他构造单元,特别是在高原东北缘、阿拉善块体和鄂尔多斯块体的交汇地区的时间延迟很大,反映了构造稳定单元的时间延迟小于构造活跃单元.通过比较快波方向的横波分裂测量值与地表变形场模拟的预测值,并结合研究区地质构造和岩石圈结构特征分析表明,在青藏高原东北缘、阿拉善块体和鄂尔多斯块体西缘各向异性主要由岩石圈变形引起,地表变形与地幔变形一致,地壳耦合于地幔,是一种垂直连贯变形模式;秦岭造山带的各向异性不仅来自于岩石圈,而且其岩石圈板块驱动的软流圈地幔流作用不可忽视;鄂尔多斯块体内部深浅变形不一致,具有弱的各向异性、厚的岩石圈和构造稳定的特征,我们认为其各向异性可能保留了古老克拉通的“化石”各向异性.
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收稿日期:  2016-03-31
修回日期:  2016-05-26
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