Journal article
Seismic constraints on the depth and composition of the mantle keel beneath the Kaapvaal craton
Earth and planetary science letters, Vol.224(3), pp.337-346
2004
Handle:
https://hdl.handle.net/2376/114292
Abstract
S–P travel-time residuals and receiver-function images are used to infer the
V
p/
V
s (compressional to shear wave velocity) ratio of the lithospheric mantle beneath southern African and the topography of the underlying 410-km discontinuity. Low
V
p/
V
s ratios provide evidence independent of geochemical observations for a highly depleted root (Mg#∼92–94) beneath the Kaapvaal craton. The receiver-function images, on the other hand, consistently show a flat 410-km discontinuity beneath the entire array. This observation, after combined with the results of geodynamical modeling, allows us to place limits on the thickness of this chemical boundary layer, which is between ∼160 and ∼370 km.
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Details
- Title
- Seismic constraints on the depth and composition of the mantle keel beneath the Kaapvaal craton
- Creators
- Fenglin Niu - Department of Earth Science, MS-126, Rice University, 6100 Main St., Houston, TX 77005, USAAlan Levander - Department of Earth Science, MS-126, Rice University, 6100 Main St., Houston, TX 77005, USACatherine M Cooper - Department of Earth Science, MS-126, Rice University, 6100 Main St., Houston, TX 77005, USACin-Ty Aeolus Lee - Department of Earth Science, MS-126, Rice University, 6100 Main St., Houston, TX 77005, USAAdrian Lenardic - Department of Earth Science, MS-126, Rice University, 6100 Main St., Houston, TX 77005, USADavid E James - Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, N.W., Washington, DC 20015, USA
- Publication Details
- Earth and planetary science letters, Vol.224(3), pp.337-346
- Academic Unit
- Environment, School of the (CAS)
- Publisher
- Elsevier B.V
- Identifiers
- 99900548131401842
- Language
- English
- Resource Type
- Journal article