The Resource Seismic anisotropy and mantle flow beneath Africa and Arabia, by Ahmed Abdalla Elsheikh

Seismic anisotropy and mantle flow beneath Africa and Arabia, by Ahmed Abdalla Elsheikh

Label
Seismic anisotropy and mantle flow beneath Africa and Arabia
Title
Seismic anisotropy and mantle flow beneath Africa and Arabia
Statement of responsibility
by Ahmed Abdalla Elsheikh
Creator
Author
Subject
Language
eng
Summary
"In spite of numerous studies, the mechanisms for the rifting, uplifting, and volcanism on the African plate remain enigmatic. The most popular hypotheses proposed for explaining these tectonic phenomena involve edge-driven small-scale mantle convection and the thermal or dynamic effects of one or more mantle plumes. In this study we use continental scale shear-wave splitting (SWS) measurements to provide additional constraints on the various models of rifting, uplifting, and volcanism of the Cameroon Volcanic Line (CVL) and the Arabian plate. The splitting of P-to-S converted phases at the core-mantle boundary on the receiver side (XKS including PKS, SKKS, and SKS) is one of the most effective approaches to constrain convective mantle flow patterns. A robust procedure involving automatic and manual batch processing to reliably assess and objectively rank shear-wave splitting parameters were used. The resulting 1532 pairs of splitting parameters show a NNE dominated fast direction. Spatial distribution of the splitting parameters in the CVL and Arabia is not consistent with the edge-driven small-scale mantle convection hypothesis, the mantle plume hypothesis, fossil fabrics formed by past tectonic events, or the fabric-forming process due to the absolute plate motion relative to the deep mantle. The research suggests that the progressive thinning of the lithosphere through basal erosion by the flow leads to decompression melting is responsible for the formation of the CVL, and olivine lattice preferred orientation in the upper asthenosphere associated with the northward motion of the African plate since 150 Ma, most likely causes the observed anisotropy across the Red Sea."--Abstract, page iv
Related
Member of
Cataloging source
UMR
http://library.link/vocab/creatorName
Elsheikh, Ahmed Abdalla
Degree
Ph. D.
Dissertation year
2014
Granting institution
Missouri University of Science and Technology
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/subjectName
  • Shear waves
  • Anisotropy
  • Volcanism
  • Earth (Planet)
Label
Seismic anisotropy and mantle flow beneath Africa and Arabia, by Ahmed Abdalla Elsheikh
Instantiates
Publication
Note
  • Vita
  • Two publications -- Page iii
Bibliography note
Includes bibliographic references (pages 84-95)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
882476991
Extent
1 online resource (ix, 96 pages)
Form of item
online
Governing access note
These materials are protected under copyright by the original author
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (most colored).
Specific material designation
remote
System control number
(OCoLC)882476991
Label
Seismic anisotropy and mantle flow beneath Africa and Arabia, by Ahmed Abdalla Elsheikh
Publication
Note
  • Vita
  • Two publications -- Page iii
Bibliography note
Includes bibliographic references (pages 84-95)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
882476991
Extent
1 online resource (ix, 96 pages)
Form of item
online
Governing access note
These materials are protected under copyright by the original author
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (most colored).
Specific material designation
remote
System control number
(OCoLC)882476991

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