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利用瑞利面波相速度和方位各向异性研究鄂尔多斯块体的岩石圈变形特征

DOI: 10.6038/cjg20140905, PP. 2777-2789

Keywords: 鄂尔多斯,瑞利面波,相速度,各向异性,岩石圈变形

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Abstract:

利用在鄂尔多斯块体内部布设的45个宽频带流动台站和固定台站的资料,用双平面波方法反演了20~143s共12个周期的基阶瑞利面波的平均相速度和方位各向异性,并反演了一维S波速度结构.反演结果显示50~100s中长周期的瑞利面波相速度高于AK135速度模型的相速度,为高速异常,S波速度显示高速异常主要位于180km深度范围内,表明鄂尔多斯块体保留有厚的高速岩石圈.20~111s周期的方位各向异性强度小于1%,较小的各向异性表明鄂尔多斯块体岩石圈变形较弱.20~50s周期的平均快波方向为近EW向,67~143s周期的平均快波方向为NW-SE向,相对发生了整体改变,快波方向的转变约开始于80~100km深度范围,这表明岩石圈上下部存在着由不同变形机制导致的各向异性.上部岩石圈中各向异性可能主要为残留的“化石”各向异性,而下部岩石圈各向异性可能是现今板块构造运动导致的变形而形成.鄂尔多斯块体岩石圈垂向上的变形差异可能主要与岩石圈温度随深度的变化以及青藏高原NE-NNE向挤压引起的上部岩石圈逆时针旋转有关.

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