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A multidisciplinary study of the final episode of the Manda Hararo dyke sequence, Ethiopia, and implications for trends in volcanism during the rifting cycle

By
T. D. Barnie
T. D. Barnie
1
Department of Geography, University of Cambridge, Downing Place, Cambridge CB2 3EN, UK
9
Present address: Laboratoire Magmas et Volcans, 5 rue Kessler, 63038 Clermont Ferrand Cedex, France
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D. Keir
D. Keir
2
National Oceanography Centre Southampton, University of Southampton, European Way, Southampton SO14 3ZH, UK
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I. Hamling
I. Hamling
3
GNS Science, 1 Fairway Drive, Avalon 5010, P.O. Box 30–368, Lower Hutt 5040, New Zealand
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B. Hofmann
B. Hofmann
4
School of Earth and Environment, Maths/Earth and Environment Building, The University of Leeds, Leeds LS2 9JT, UK
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M. Belachew
M. Belachew
5
Boone Pickens School of Geology, Noble Research Center, Oklahoma State University, Stillwater, OK 74078, USA
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S. Carn
S. Carn
6
Department of Geological and Mining Engineering and Sciences, Michigan Tech, 630 Dow Environmental Sciences, 1400 Townsend Drive, Houghton, MI 49931, USA
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D. Eastwell
D. Eastwell
2
National Oceanography Centre Southampton, University of Southampton, European Way, Southampton SO14 3ZH, UK
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J. O. S. Hammond
J. O. S. Hammond
7
Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
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A. Ayele
A. Ayele
8
Institute of Geophysics, Space Science and Astronomy, Addis Ababa University, Arat Kilo Campus, Addis Ababa, PO Box 1176, Ethiopia
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C. Oppenheimer
C. Oppenheimer
1
Department of Geography, University of Cambridge, Downing Place, Cambridge CB2 3EN, UK
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T. Wright
T. Wright
4
School of Earth and Environment, Maths/Earth and Environment Building, The University of Leeds, Leeds LS2 9JT, UK
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Published:
January 01, 2016

Abstract

The sequence of dyke intrusions between 2005 and 2010 in the Manda Hararo rift segment, Ethiopia, provided an opportunity to test conceptual models of continental rifting. Based on trends up to dyke 13 in the sequence, it was anticipated that, should magma supply continue, dykes would shorten in length and eruptions would increase in size and decrease in distance from the segment centre as extensional stress was progressively released. In this paper we revisit these predictions by presenting a comprehensive overview of the May 2010 dyke and fissure eruption, the 14th and last in the sequence, from InSAR, seismicity, satellite thermal data, ultraviolet SO2 retrievals and multiple LiDAR surveys. We find the dyke is longer than other eruptive dykes in the sequence, propagating in two directions from the segment centre, but otherwise fairly typical in terms of opening, propagation speed and geodetic and seismic moment. However, though the eruption is located closer to the segment centre, it is much smaller than previous events. We interpret this as indicating that either the Manda Hararo rifting event was magma limited, or that extensional stress varies north and south of the segment centre.

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Contents

Geological Society, London, Special Publications

Magmatic Rifting and Active Volcanism

T. J. Wright
T. J. Wright
University of Leeds, UK
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A. Ayele
A. Ayele
Addis Ababa University, Ethiopia
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D. J. Ferguson
D. J. Ferguson
University of Leeds, UK
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T. Kidane
T. Kidane
Addis Ababa University, Ethiopia
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C. Vye-Brown
C. Vye-Brown
British Geological Survey, UK
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Geological Society of London
Volume
420
ISBN electronic:
9781862391345
Publication date:
January 01, 2016

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