Two anisotropic layers in central orogenic belt of North China Craton

被引：14

作者：

Bai, Ling ^{[1
]}

Kawakatsu, Hitoshi ^{[1
]}

Morita, Yuichi ^{[1
]}

机构：

[1] Univ Tokyo, Earthquake Res Inst, Bunkyo Ku, Tokyo 1130032, Japan

来源：

TECTONOPHYSICS | 2010年 / 494卷 / 1-2期

基金：

日本学术振兴会;

关键词：

Two layers of anisotropy; North China Craton; Shear-wave splitting; UPPER-MANTLE; EASTERN CHINA; WAVE; DEFORMATION; BENEATH;

D O I：

10.1016/j.tecto.2010.09.002

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

We present evidence of two layers of anisotropy in Earth's upper mantle beneath the central orogenic belt of the North China Craton from teleseismic shear-wave splitting analysis. A one-layer model is in disagreement with the well-constrained azimuth-dependent splitting parameters for stations in the central orogenic belt; however, two layers of anisotropy improve the fit to the data. At the bottom layer, the fast polarization directions are subparallel to the absolute plate motion, indicating the presence of the current strain within the subcratonic asthenosphere related to the interactions between the surrounding plates. In contrast, at the top layer, the fast polarization directions are consistent with the strikes of the local surface faults, confirming a combined contribution of the past orogenies in the lithosphere. (C) 2010 Elsevier B.V All rights reserved.

引用

页码：138 / 148

页数：11

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