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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Upper-mantle anisotropy beneath the Cameroon Volcanic Line and Congo Craton from shear wave splitting measurements
Geophysical Journal International, Volume 190, No. 1, Year 2012
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Description
The Cameroon Volcanic Line (CVL) is an 1800-km-long line of Cenozoic volcanoes that does not show a chronological progression consistent with hotspot-related volcanism. We investigate seismic anisotropy to determine the upper-mantle lattice preferred orientation and constrain the mantle flow pattern using a temporary array of 32 broad-band seismographs deployed throughout Cameroon between 2005 and 2007 along with two additional permanent seismographs in adjacent countries. We determine the fast direction and lag time beneath each station by stacking SKS and SKKS splitting measurements from multiple events. The results indicate four regions with different splitting parameters. The Congo Craton in southern Cameroon and the Garoua rift region in northeast Cameroon have northeast-southwest-oriented fast directions and split times of about 1 s. Between the Congo Craton and the CVL, in central Cameroon, the fast directions are variable and have small splitting times of 0.3 s or less. Along the CVL, where previous studies show a strong slow velocity anomaly in the mantle, the fast direction is oriented approximately north-south, with splitting times of about 0.7 s. We interpret measurements from southern Cameroon and northeast Cameroon as indications of lattice-preferred orientation frozen into the Congo Craton and subcontinental lithosphere related to relict plate motion and deformation. The distinct pattern of splitting along the CVL suggests the existence of small-scale convection in the asthenosphere related to the formation of the CVL, perhaps driven by the adjacent cold edge of the Congo Craton. © 2012 The Authors Geophysical Journal International © 2012 RAS.
Authors & Co-Authors
Koch, Franklin W.
United States, St. Louis
Washington University in St. Louis
Wiens, Douglas A.
United States, St. Louis
Washington University in St. Louis
Nyblade, Andrew A.
United States, University Park
Pennsylvania State University
Shore, Patrick J.
United States, St. Louis
Washington University in St. Louis
Tibi, Rigobert
United States, St. Louis
Washington University in St. Louis
United States, Pittsburgh
Rizzo Associates
Ateba, Bekoa H.
Cameroon, Yaounde
Institute for Geological and Mining Research
Tabod, Charles
Cameroon, Yaounde
Université de Yaoundé I
Nnange, Joseph Metuk
Cameroon, Yaounde
Institute for Geological and Mining Research
Statistics
Citations: 39
Authors: 8
Affiliations: 5
Identifiers
Doi:
10.1111/j.1365-246X.2012.05497.x
ISSN:
0956540X
e-ISSN:
1365246X
Study Locations
Cameroon
Congo