Insight into craton evolution: Constraints from shear wave splitting in the North China Craton

IF 2.4 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Physics of the Earth and Planetary Interiors Pub Date : 2008-07-01 DOI:10.1016/j.pepi.2008.06.003

Liang Zhao, Tianyu Zheng, Gang Lü

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引用次数: 36

Abstract

The multi-episodic tectonic activities from the Precambrian to Cenozoic, including nucleus formation, cratonic amalgamation, and rejuvenation, make the North China Craton (NCC) an ideal natural laboratory for studying craton evolution. Spatial change in the upper deformation records is an important aspect for understanding cratonic formation and rejuvenation. In this study, we performed seismic shear wave splitting analysis using SKS phases from 50 portable stations. Two different methodologies, shear wave splitting measurement and amplitude analysis of transverse/radial components, produced mutually consistent splitting results. These results showed that the seismic anisotropy beneath the Ordos Block can be divided into three subgroups reflecting the tectonic control. Combining these results with those from previous splitting studies in the eastern NCC, we suggest that the Proterozoic amalgamation generated the seismic anisotropy in the boundary zone between the Ordos Block and the Trans-North China Orogen, while the anisotropy in the eastern Trans-North China Orogen and eastern NCC were possibly associated with the lithospheric rejuvenation during the Late Mesozoic to Cenozoic.

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克拉通演化透视:华北克拉通剪切波分裂的制约因素

华北克拉通前寒武纪至新生代的多期构造活动，包括核形成、克拉通合并和复兴，使华北克拉通成为研究克拉通演化的理想天然实验室。上部变形记录的空间变化是认识克拉通形成和恢复的重要方面。在这项研究中，我们利用50个便携式台站的SKS相位进行了地震横波分裂分析。两种不同的方法，横波分裂测量和横向/径向分量振幅分析，产生了相互一致的分裂结果。结果表明，鄂尔多斯地块下地震各向异性可划分为3个亚群，反映了构造的控制作用。结合前人在北中陆块东部的分裂研究结果，认为元古代的合并作用导致了鄂尔多斯地块与跨华北造山带交界带的地震各向异性，而跨华北造山带东部和北中陆块东部的各向异性可能与晚中生代至新生代岩石圈的恢复有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理

CiteScore

5.00

自引率

4.30%

发文量

审稿时长

18.5 weeks

期刊介绍： Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.