Mantle transition zone variations beneath the Ethiopian Rift and Afar

Chemical heterogeneity within a hot mantle?

D.G. Cornwell (Corresponding Author), G. Hetényi, T.D. Blanchard

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

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 dV > 3 %) upper mantle. The 660 discontinuity is shown to have variations in depth (665-705 km) over short length scales (260 km) indicate possible compositional/chemical heterogeneities and elevated ambient temperatures near the base of the MTZ. These observations provide evidence for a link between the low velocity anomalies of the Ethiopian upper mantle and the African Superplume in the lower mantle.
Original languageEnglish
JournalGeophysical Research Letters
Volume38
Issue number16
DOIs
Publication statusPublished - Aug 2011

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transition zone
upper mantle
discontinuity
Earth mantle
mantle
lower mantle
anomaly
temperature
ambient temperature
low speed
receivers
chemical
anomalies

Keywords

  • Ethiopia
  • mantle
  • rift
  • transition

Cite this

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title = "Mantle transition zone variations beneath the Ethiopian Rift and Afar: Chemical heterogeneity within a hot mantle?",
abstract = "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 dV > 3 {\%}) upper mantle. The 660 discontinuity is shown to have variations in depth (665-705 km) over short length scales (260 km) indicate possible compositional/chemical heterogeneities and elevated ambient temperatures near the base of the MTZ. These observations provide evidence for a link between the low velocity anomalies of the Ethiopian upper mantle and the African Superplume in the lower mantle.",
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T2 - Chemical heterogeneity within a hot mantle?

AU - Cornwell, D.G.

AU - Hetényi, G.

AU - Blanchard, T.D.

PY - 2011/8

Y1 - 2011/8

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AB - 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 dV > 3 %) upper mantle. The 660 discontinuity is shown to have variations in depth (665-705 km) over short length scales (260 km) indicate possible compositional/chemical heterogeneities and elevated ambient temperatures near the base of the MTZ. These observations provide evidence for a link between the low velocity anomalies of the Ethiopian upper mantle and the African Superplume in the lower mantle.

KW - Ethiopia

KW - mantle

KW - rift

KW - transition

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DO - 10.1029/2011GL047575

M3 - Article

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 16

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