Mantle transition zone variations beneath the Ethiopian Rift and Afar: Chemical heterogeneity within a hot mantle?

Mantle transition zone variations beneath the Ethiopian Rift and Afar: Chemical heterogeneity within a hot mantle?

The mantle transition zone (MTZ) structure beneath the Ethiopian Rift and Afar is mapped using receiver functions. The 410 discontinuity is flat and regionally depressed by 30–40 km, most likely due to a hot (≥+250 °C) and slow (average δVS > 3 %) upper mantle. The 660 discontinuity is shown to h...

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Veröffentlicht in:Geophysical research letters 2011-08, Vol.38 (16), p.n/a
Hauptverfasser: Cornwell, D. G., Hetényi, G., Blanchard, T. D.
Format: Artikel
Sprache:eng
Schlagworte:
Ambient temperature
Discontinuity
Earth
Earth sciences
Earth, ocean, space
Elevated
Ethiopia
Exact sciences and technology
Geophysics
Heterogeneity
Links
Lower mantle
Mantle
Plate tectonics
Receivers
rift
Seismology
transition
Transition zone
Upper mantle
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Beschreibung
Zusammenfassung:The mantle transition zone (MTZ) structure beneath the Ethiopian Rift and Afar is mapped using receiver functions. The 410 discontinuity is flat and regionally depressed by 30–40 km, most likely due to a hot (≥+250 °C) and slow (average δVS > 3 %) upper mantle. The 660 discontinuity is shown to have variations in depth (665–705 km) over short length scales (
ISSN:0094-8276
1944-8007
DOI:10.1029/2011GL047575