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Article
Receiver Function Imaging of Mantle Transition Zone Discontinuities Beneath the Tanzania Craton and Adjacent Segments of the East African Rift System
Geophysical Research Letters
  • Muchen Sun
  • Kelly H. Liu, Missouri University of Science and Technology
  • Xiaofei Fu
  • Stephen S. Gao, Missouri University of Science and Technology
Abstract

The mantle transition zone (MTZ) discontinuities beneath the Tanzania Craton and the Eastern and Western Branches of the East African Rift System are imaged by stacking over 7,100 receiver functions. The mean thickness of the MTZ beneath the Western Branch and Tanzania Craton is about 252 km, which is comparable to the global average and is inconsistent with the existence of present-day thermal upwelling originating from the lower mantle. In contrast, beneath the Eastern Branch, an up to 30 km thinning of the MTZ is observed and is attributable to upwelling of higher temperature materials from either the upper MTZ or the lower mantle. The observations are in agreement with the hypothesis that rifting in Africa is primarily driven by gradients of gravitational potential energy and lateral variations of basal traction force along zones of significant changes of lithospheric thickness such as the edges of the Tanzania Craton.

Department(s)
Geosciences and Geological and Petroleum Engineering
Comments

The study was partially supported by the then Continental Dynamics Program of the U.S. National Science Foundation under grant 1009946 to S.G. and K.L. and by the China Scholarship Council to M.S.

Keywords and Phrases
  • Continental rifting,
  • East African Rift System,
  • Mantle plume,
  • Mantle transition zone,
  • Receiver function
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2017 American Geophysical Union (AGU), All rights reserved.
Publication Date
12-1-2017
Disciplines
Citation Information
Muchen Sun, Kelly H. Liu, Xiaofei Fu and Stephen S. Gao. "Receiver Function Imaging of Mantle Transition Zone Discontinuities Beneath the Tanzania Craton and Adjacent Segments of the East African Rift System" Geophysical Research Letters Vol. 44 Iss. 24 (2017) p. 12,116 - 12,124 ISSN: 0094-8276; 1944-8007
Available at: http://works.bepress.com/kelly-liu/123/