Lithospheric Effective Elastic Thickness and Its Anisotropy in the Northeast Qinghai-Tibetan Plateau
详细信息
- 责任者：Li Yongdong (China University of Geosciences ; Wuhan 430074 ; China) ; Zheng Yong
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(4)
- 关键词：岩石圈 ; lithosphere ; 速度结构 ; velocity structure ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.1132-1145
- 图表：illus., 83 refs.
- 分类号：0400
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
Adjacent to Qiangtang terrane,Tarim basin,Sichuan basin and North China block,the northeast Qinghai-Tibet plateau is one of the major tectonic provinces in mainland China,which is a combinative region with subduction,collision and intracontinental gathering and plays an important role in the deformation and evolution process of continental China.The lithospheric effective elastic thickness(T e) and its correspondent mechanical anisotropy are tightly related to the rheologic properties and the mechanic structures.Thus,studying on these characteristics in the northeast Qinghai-Tibet plateau will provide important information for understanding the rheologic structure and the dynamic process of continental lithosphere.In this work,Fan wavelet analysis on coherence between Bouguer anomaly and topography is applied to obtain a more detailed two dimensional lithospheric T e structure as well as its anisotropic properties in the Songpan-Garzêterrane.The results show that the effective elastic thickness of the lithosphere varies significantly from 5km to 100km.In general,in the east margin of the northeast QinghaiTibet plateau,the Songpan-Garzêterrane is a weak tectonic zone with a low T e(5kmlikely most therein anisotropy e T basin,the Qaidam crystals.In olivine of alignment to due lithosphere deformation ? frozen coherent vertically be massif Alxa observed our source that suggest axes,we azimuthal seismic and SKS with results comparing boundaries.By perpendicular are axes mechanical weak show studies,our seismological surveys geological blocks.Compared cratonic old fragments underlain should basin believe crust.Therefore,we Paleozoic which edge well-defined a 90km,with 50～ ranges magnitude block,the rigid shows distribution rigidity.The strong capable still Zoigêbasin implies area,which surrounding than higher little segments.T south north into divided can structure anisotropic 5～20km,and only weak,where extremely strength mountain Longmenshan zones.In suture zones fault as blocks,such marginal distributed also Teanomalies anisotropy.Low 40km) <>
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |