Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic

The upper oceanic crust is produced by magmatism at mid-ocean ridges, a process thought to be characterized by cyclic bouts of intense magmatic activity, separated by periods when faulting accommodates most or even all of the plate motion. It is not known whether there is a distinct periodicity to s...

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Published in:Earth and Planetary Science Letters
Main Authors: Yeo, Isobel A., Devey, Colin W., LeBas, T.B., Augustin, Nico, Steinführer, Anja
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2016
Subjects:
Online Access:https://oceanrep.geomar.de/id/eprint/31289/
https://oceanrep.geomar.de/id/eprint/31289/1/Yeo_2016.pdf
https://doi.org/10.1016/j.epsl.2016.01.029
id ftoceanrep:oai:oceanrep.geomar.de:31289
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spelling ftoceanrep:oai:oceanrep.geomar.de:31289 2023-05-15T17:05:06+02:00 Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic Yeo, Isobel A. Devey, Colin W. LeBas, T.B. Augustin, Nico Steinführer, Anja 2016-01-24 text https://oceanrep.geomar.de/id/eprint/31289/ https://oceanrep.geomar.de/id/eprint/31289/1/Yeo_2016.pdf https://doi.org/10.1016/j.epsl.2016.01.029 en eng Elsevier https://oceanrep.geomar.de/id/eprint/31289/1/Yeo_2016.pdf Yeo, I. A., Devey, C. W. , LeBas, T. B., Augustin, N. and Steinführer, A. (2016) Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic. Open Access Earth and Planetary Science Letters, 439 . pp. 81-87. DOI 10.1016/j.epsl.2016.01.029 <https://doi.org/10.1016/j.epsl.2016.01.029>. doi:10.1016/j.epsl.2016.01.029 cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2016 ftoceanrep https://doi.org/10.1016/j.epsl.2016.01.029 2023-04-07T15:23:20Z The upper oceanic crust is produced by magmatism at mid-ocean ridges, a process thought to be characterized by cyclic bouts of intense magmatic activity, separated by periods when faulting accommodates most or even all of the plate motion. It is not known whether there is a distinct periodicity to such magmatic–tectonic cycles. Here we present high-resolution sidescan sonar data from the neovolcanic zone of the North Kolbeinsey Ridge, a shallow slow-spreading ridge where high glacial and steady post-glacial sedimentation rates allow relative flow ages to be determined with a resolution of around 2 kyrusing backscatter amplitude as a proxy for sediment thickness and hence age. We identify 18 lava flow fields covering 40% of the area surveyed. A group of 7 flowfields showing the highest (and similar) backscatter intensity are scattered along 75 km of axial valley surveyed, suggesting that at least this length of the segment was magmatically active within a 1.2 kyrtime window. Based on conservative age estimates for all datable flows and estimated eruption volumes, the post-glacial volcanic activity imaged is insufficient to maintain crustal thickness, implying that episode(s) of enhanced activity must have preceded the volcanism we image. Article in Journal/Newspaper Kolbeinsey OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Kolbeinsey ENVELOPE(-18.687,-18.687,67.149,67.149) Kolbeinsey Ridge ENVELOPE(-16.917,-16.917,68.833,68.833) Earth and Planetary Science Letters 439 81 87
institution Open Polar
collection OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
op_collection_id ftoceanrep
language English
description The upper oceanic crust is produced by magmatism at mid-ocean ridges, a process thought to be characterized by cyclic bouts of intense magmatic activity, separated by periods when faulting accommodates most or even all of the plate motion. It is not known whether there is a distinct periodicity to such magmatic–tectonic cycles. Here we present high-resolution sidescan sonar data from the neovolcanic zone of the North Kolbeinsey Ridge, a shallow slow-spreading ridge where high glacial and steady post-glacial sedimentation rates allow relative flow ages to be determined with a resolution of around 2 kyrusing backscatter amplitude as a proxy for sediment thickness and hence age. We identify 18 lava flow fields covering 40% of the area surveyed. A group of 7 flowfields showing the highest (and similar) backscatter intensity are scattered along 75 km of axial valley surveyed, suggesting that at least this length of the segment was magmatically active within a 1.2 kyrtime window. Based on conservative age estimates for all datable flows and estimated eruption volumes, the post-glacial volcanic activity imaged is insufficient to maintain crustal thickness, implying that episode(s) of enhanced activity must have preceded the volcanism we image.
format Article in Journal/Newspaper
author Yeo, Isobel A.
Devey, Colin W.
LeBas, T.B.
Augustin, Nico
Steinführer, Anja
spellingShingle Yeo, Isobel A.
Devey, Colin W.
LeBas, T.B.
Augustin, Nico
Steinführer, Anja
Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic
author_facet Yeo, Isobel A.
Devey, Colin W.
LeBas, T.B.
Augustin, Nico
Steinführer, Anja
author_sort Yeo, Isobel A.
title Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic
title_short Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic
title_full Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic
title_fullStr Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic
title_full_unstemmed Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic
title_sort segment-scale volcanic episodicity: evidence from the north kolbeinsey ridge, atlantic
publisher Elsevier
publishDate 2016
url https://oceanrep.geomar.de/id/eprint/31289/
https://oceanrep.geomar.de/id/eprint/31289/1/Yeo_2016.pdf
https://doi.org/10.1016/j.epsl.2016.01.029
long_lat ENVELOPE(-18.687,-18.687,67.149,67.149)
ENVELOPE(-16.917,-16.917,68.833,68.833)
geographic Kolbeinsey
Kolbeinsey Ridge
geographic_facet Kolbeinsey
Kolbeinsey Ridge
genre Kolbeinsey
genre_facet Kolbeinsey
op_relation https://oceanrep.geomar.de/id/eprint/31289/1/Yeo_2016.pdf
Yeo, I. A., Devey, C. W. , LeBas, T. B., Augustin, N. and Steinführer, A. (2016) Segment-scale volcanic episodicity: Evidence from the North Kolbeinsey Ridge, Atlantic. Open Access Earth and Planetary Science Letters, 439 . pp. 81-87. DOI 10.1016/j.epsl.2016.01.029 <https://doi.org/10.1016/j.epsl.2016.01.029>.
doi:10.1016/j.epsl.2016.01.029
op_rights cc_by_nc_nd_4.0
info:eu-repo/semantics/openAccess
op_doi https://doi.org/10.1016/j.epsl.2016.01.029
container_title Earth and Planetary Science Letters
container_volume 439
container_start_page 81
op_container_end_page 87
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