https://scholars.lib.ntu.edu.tw/handle/123456789/412277
標題: | Reactivation of an Archean Craton: constraints from P- and s-wave tomography in North China | 作者: | Zhao, Liang Allen, Richard M. Zheng, Tianyu SHU-HUEI HUNG |
公開日期: | 1-九月-2009 | 出版社: | AMER GEOPHYSICAL UNION | 卷: | 36 | 期: | 17 | 來源出版物: | Geophysical Research Letters | 摘要: | The unusual reactivation of the North China Craton (NCC) challenges the classical views concerning the strength and stability of cratonic lithosphère. By using teleseismic body-waves recorded at 250 seismic stations, this paper presents high-resolution North China Models of P- and S-wave velocity based on finite-frequency kernel tomography. Both P- and S-wave velocity models reveal that: (1) an obvious N-S trending narrow low-velocity region is located at the base of the lithosphère beneath the Central Block (CB) of the NCC, which extends to more than 500 km depth; (2) a region of high-velocity extends to more than 250-300 km depth beneath the Western Block, in contrast to the much shallower high-velocity zones beneath the CB and shallower high-velocities beneath the Eastern Block. These features suggest that warm mantle material with a source at least as deep as the transition zone, possibly a mantle plume, may be responsible for the reactivation of the NCC. The Central Block may have behaved as a sublithospheric corridor for the warm mantle material due to its pre-existing weakness. Copyright 2009 by the American Geophysical Union. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/412277 | ISSN: | 00948276 | DOI: | 10.1029/2009GL039781 |
顯示於: | 地質科學系 |
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2009GL039781.pdf | 1.74 MB | Adobe PDF | 檢視/開啟 |
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