Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/39323
Title: The Kenya rift revisited: Insights into lithospheric strength through data-driven 3-D gravity and thermal modelling
Authors: Sippel, J.
Meeßen, C.
Cacace, M.
Mechie, J.
Fishwick, Stuart
Heine, C.
Scheck-Wenderoth, M.
Strecker, M. R.
First Published: 16-Jan-2017
Publisher: European Geosciences Union
Citation: Solid Earth, 2017, 8 (1), pp. 45-81
Abstract: We present three-dimensional (3-D) models that describe the present-day thermal and rheological state of the lithosphere of the greater Kenya rift region aiming at a better understanding of the rift evolution, with a particular focus on plume-lithosphere interactions. The key methodology applied is the 3-D integration of diverse geological and geophysical observations using gravity modelling. Accordingly, the resulting lithospheric-scale 3-D density model is consistent with (i) reviewed descriptions of lithological variations in the sedimentary and volcanic cover, (ii) known trends in crust and mantle seismic velocities as revealed by seismic and seismological data and (iii) the observed gravity field. This data-based model is the first to image a 3-D density configuration of the crystalline crust for the entire region of Kenya and northern Tanzania. An upper and a basal crustal layer are differentiated, each composed of several domains of different average densities. We interpret these domains to trace back to the Precambrian terrane amalgamation associated with the East African Orogeny and to magmatic processes during Mesozoic and Cenozoic rifting phases. In combination with seismic velocities, the densities of these crustal domains indicate compositional differences. The derived lithological trends have been used to parameterise steady-state thermal and rheological models. These models indicate that crustal and mantle temperatures decrease from the Kenya rift in the west to eastern Kenya, while the integrated strength of the lithosphere increases. Thereby, the detailed strength configuration appears strongly controlled by the complex inherited crustal structure, which may have been decisive for the onset, localisation and propagation of rifting.
DOI Link: 10.5194/se-8-45-2017
ISSN: 1869-9510
eISSN: 1869-9529
Links: http://www.solid-earth.net/8/45/2017/
http://hdl.handle.net/2381/39323
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2016. This is an open-access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/3.0/ ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Geology

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