Probing the edge of the West African Craton: a first seismic glimpse from Niger

Jeanette F. Di Leo*, James Wookey, J. Michael Kendall, Neil D. Selby

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

4 Citations (Scopus)
299 Downloads (Pure)

Abstract

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 IMS array TORD in SW Niger. Despite lacking in lateral coverage, our measurements sharply constrain crustal thickness (∼41 km), VP /VS ratio (1.69±0.03), mantle transition zone (MTZ) thickness (∼247 km), and a mid-lithospheric discontinuity at ∼67 km depth. Splitting delay times are low with an average of 0.63±0.01 s. 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.
Original languageEnglish
Pages (from-to)1694-1700
Number of pages7
JournalGeophysical Research Letters
Volume42
Issue number6
Early online date19 Mar 2015
DOIs
Publication statusPublished - 28 Mar 2015

Bibliographical note

Date of Acceptance: 17/01/2015

Keywords

  • cratons
  • mantle transition zone
  • receiver functions

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