The spatial and volcanic evolution of Ayelu, Abida and Yangudi volcanoes in the Northern Main Ethiopian Rift – Southern Afar, Ethiopia
The spatial and volcanic evolution of Ayelu, Abida and Yangudi volcanoes in the Northern Main Ethiopian Rift – Southern Afar, Ethiopia
The region between the Northern Main Ethiopian Rift and Southern Afar is a key link between two important sectors of the East African Rift System. Recent volcanism in this area occurs as a chain of NNE-SSW trending axial Quaternary volcanoes and volcanic fields, segmented and offset laterally by WNW-ESE trending right-steps. Here, we present the first whole-rock major element geochemical dataset from volcanoes in one such volcanic segment, the Adda'do Magmatic Segment (AMS). We combine these geochemical data with detailed remote sensing mapping of the region, to produce a relative chronology of the volcanic units. We investigate the volcanic evolution and composition of these volcanoes and find that all three volcanoes in the AMS exhibit similar evolutionary patterns, beginning with a base of older (presumed Plio-Pleistocene age) lavas, followed by a period of large-volume evolved magmatism, and recent basaltic-intermediate eruptions. Our results show evidence for at least three cycles of mafic-to-felsic evolution in the southern AMS, in agreement with earlier studies, indicating that the AMS has long been a site of volcanic activity.
Adda'do Magmatic Segment (AMS), Afar, Bimodal volcanism, Continental rifting, Main Ethiopian Rift
Rees, Rhiannon
e4eb2f3f-4f7f-41e0-b434-26fcaf238708
Gernon, Thomas M.
658041a0-fdd1-4516-85f4-98895a39235e
Keir, Derek
5616f81f-bf1b-4678-a167-3160b5647c65
Taylor, Rex N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Pagli, Carolina
290edb22-712b-4563-a868-af4c21fdb6b0
1 August 2023
Rees, Rhiannon
e4eb2f3f-4f7f-41e0-b434-26fcaf238708
Gernon, Thomas M.
658041a0-fdd1-4516-85f4-98895a39235e
Keir, Derek
5616f81f-bf1b-4678-a167-3160b5647c65
Taylor, Rex N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Pagli, Carolina
290edb22-712b-4563-a868-af4c21fdb6b0
Rees, Rhiannon, Gernon, Thomas M., Keir, Derek, Taylor, Rex N. and Pagli, Carolina
(2023)
The spatial and volcanic evolution of Ayelu, Abida and Yangudi volcanoes in the Northern Main Ethiopian Rift – Southern Afar, Ethiopia.
Journal of Volcanology and Geothermal Research, 440, [107846].
(doi:10.1016/j.jvolgeores.2023.107846).
Abstract
The region between the Northern Main Ethiopian Rift and Southern Afar is a key link between two important sectors of the East African Rift System. Recent volcanism in this area occurs as a chain of NNE-SSW trending axial Quaternary volcanoes and volcanic fields, segmented and offset laterally by WNW-ESE trending right-steps. Here, we present the first whole-rock major element geochemical dataset from volcanoes in one such volcanic segment, the Adda'do Magmatic Segment (AMS). We combine these geochemical data with detailed remote sensing mapping of the region, to produce a relative chronology of the volcanic units. We investigate the volcanic evolution and composition of these volcanoes and find that all three volcanoes in the AMS exhibit similar evolutionary patterns, beginning with a base of older (presumed Plio-Pleistocene age) lavas, followed by a period of large-volume evolved magmatism, and recent basaltic-intermediate eruptions. Our results show evidence for at least three cycles of mafic-to-felsic evolution in the southern AMS, in agreement with earlier studies, indicating that the AMS has long been a site of volcanic activity.
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Accepted/In Press date: 16 June 2023
e-pub ahead of print date: 17 June 2023
Published date: 1 August 2023
Additional Information:
Funding Information:
This work was funded by the Natural Environmental Research Council [grant number NE/S007210/1] as part of the INSPIRE Doctoral Training Program. DK acknoweldges Natural Environment Research Council (NERC) grant NE/L013932/1. DK and CP acknoweldge the Ministero dell'Università e della Ricerca (MiUR) through PRIN grant 2017P9AT72. TG was supported by The Alan Turing Institute under the EPSRC grant EP/N510129/1. We acknowledge the use of rocks from the Afar Repository of the University of Pisa (https://repositories.dst.unipi.it/index.php/home-afar), and would like to acknowledge the efforts and contributions of everyone involved in these 1970s sample collection expeditions in Afar. We would like to thank the reviewers David Pyle and Cathy Busby for their detailed, helpful and constructive comments, which helped us improve the quality of this manuscript.
Funding Information:
This work was funded by the Natural Environmental Research Council [grant number NE/S007210/1 ] as part of the INSPIRE Doctoral Training Program. DK acknoweldges Natural Environment Research Council (NERC) grant NE/L013932/1 . DK and CP acknoweldge the Ministero dell'Università e della Ricerca (MiUR) through PRIN grant 2017P9AT72 . TG was supported by The Alan Turing Institute under the EPSRC grant EP/N510129/1 . We acknowledge the use of rocks from the Afar Repository of the University of Pisa ( https://repositories.dst.unipi.it/index.php/home-afar ), and would like to acknowledge the efforts and contributions of everyone involved in these 1970s sample collection expeditions in Afar.
Publisher Copyright:
© 2023 The Authors
Keywords:
Adda'do Magmatic Segment (AMS), Afar, Bimodal volcanism, Continental rifting, Main Ethiopian Rift
Identifiers
Local EPrints ID: 481264
URI: http://eprints.soton.ac.uk/id/eprint/481264
ISSN: 0377-0273
PURE UUID: 10664313-a8f9-4bce-986d-ca61e35230f3
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Date deposited: 21 Aug 2023 16:58
Last modified: 18 Mar 2024 03:18
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Author:
Carolina Pagli
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