DOI: 10.1002/2014GL062502
论文题名: Probing the edge of the West African Craton: A first seismic glimpse from Niger
作者: Di Leo J.F. ; Wookey J. ; Kendall J.-M. ; Selby N.D.
刊名: Geophysical Research Letters
ISSN: 0094-8835
EISSN: 1944-8566
出版年: 2015
卷: 42, 期: 6 起始页码: 1694
结束页码: 1700
语种: 英语
英文关键词: cratons
; mantle transition zone
; receiver functions
Scopus关键词: Shear waves
; Structural geology
; Cratons
; Crustal thickness
; International monitoring systems
; Mantle structure
; Mantle transition zone
; Paleoproterozoic
; Receiver functions
; S-wave splitting
; Monitoring
; craton
; lithosphere
; mantle structure
; S-wave
; transition zone
; Niger [Nigeria]
; Nigeria
; West African Craton
英文摘要: Constraints on crustal and mantle structure of the Eastern part of the West African Craton have to date been scarce. Here we present results of P receiver function and SK(K)S wave splitting analyses of data recorded at International Monitoring System array TORD in SW Niger. Despite lacking in lateral coverage, our measurements sharply constrain crustal thickness (∼41km), VP/VS ratio (1.69 ± 0.03), mantle transition zone (MTZ) thickness (∼247km), and a midlithospheric discontinuity at ∼67km depth. Splitting delay times are low with an average of 0.63 ± 0.01s. Fast directions follow the regional surface geological trend with an average of 57 ± 1°. We suggest that splitting is due to fossil anisotropic fabrics in the crust and lithosphere, incurred during the Paleoproterozoic Eburnean Orogeny, with possible contributions from the later Pan-African Orogeny and present-day mantle flow. The MTZ appears to be unperturbed, despite the proximity of the sampled region to the deep cratonic root. Key Points First receiver function and shear wave splitting results for the WAC beneath Niger New constraints on crustal, lithospheric, and mantle transition zone structure The mantle transition zone beneath the cratonic root is thermally unperturbed ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927798982&doi=10.1002%2f2014GL062502&partnerID=40&md5=90bacfc1da693ee8911120bd5db1e225
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8451
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Earth Sciences, University of Bristol, Bristol, United Kingdom
Recommended Citation:
Di Leo J.F.,Wookey J.,Kendall J.-M.,et al. Probing the edge of the West African Craton: A first seismic glimpse from Niger[J]. Geophysical Research Letters,2015-01-01,42(6).