Feybesse J.‐L.

J.‐Michael Kendall

James Wookey

Jeanette F. Di Leo

Neil D. Selby

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Geophysical Research Letters

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

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

Di Leo, Jeanette F.

Wookey, James

Kendall, J. Michael

Selby, Neil D.

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

https://research-information.bris.ac.uk/files/36049990/Di_Leo_Wookey_Kendall_and_Selby_2015_.pdf

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

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