Earthquake Seismicity Reveals the Location and Significance of the Shona Mantle Plume in the South Atlantic Ocean
Abstract The South Atlantic Ocean hosts several well‐studied volcanic ridges and seamount chains, but the origin of their associated mantle plumes is debated. Reduced seismicity on the southern Mid‐Atlantic Ridge (MAR) suggests anomalously ductile thermomechanical conditions at 52°S and 47.5°S. Thes...
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ftdoajarticles:oai:doaj.org/article:c9e67effeb2f4a288195fd00b5fbadd3 2024-09-15T18:00:14+00:00 Earthquake Seismicity Reveals the Location and Significance of the Shona Mantle Plume in the South Atlantic Ocean Ross Parnell‐Turner 2024-06-01T00:00:00Z https://doi.org/10.1029/2024GL109738 https://doaj.org/article/c9e67effeb2f4a288195fd00b5fbadd3 EN eng Wiley https://doi.org/10.1029/2024GL109738 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL109738 https://doaj.org/article/c9e67effeb2f4a288195fd00b5fbadd3 Geophysical Research Letters, Vol 51, Iss 11, Pp n/a-n/a (2024) mantle plume mid‐ocean ridge southern Atlantic Ocean Geophysics. Cosmic physics QC801-809 article 2024 ftdoajarticles https://doi.org/10.1029/2024GL109738 2024-08-05T17:48:59Z Abstract The South Atlantic Ocean hosts several well‐studied volcanic ridges and seamount chains, but the origin of their associated mantle plumes is debated. Reduced seismicity on the southern Mid‐Atlantic Ridge (MAR) suggests anomalously ductile thermomechanical conditions at 52°S and 47.5°S. These low seismicity patches extend 120–560 km along‐axis, and correspond with axial high spreading ridge morphology, geochemical anomalies, and mantle wave speed patterns likely associated with the Shona and Discovery plumes. Bathymetric data show that the northern extent of the Shona swell is associated with increased volcanism, elevated axial bathymetry, and a series of northward‐propagating rifts, with the overall swell geometry suggesting a buoyancy flux of 0.4–0.5 Mg s−1. The nearby Bouvet Island may be a product of a branch of the larger Shona plume swell, which has influenced crustal accretion on the southern MAR for the past 24 million years. Article in Journal/Newspaper Bouvet Island South Atlantic Ocean Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 51 11 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
mantle plume mid‐ocean ridge southern Atlantic Ocean Geophysics. Cosmic physics QC801-809 |
spellingShingle |
mantle plume mid‐ocean ridge southern Atlantic Ocean Geophysics. Cosmic physics QC801-809 Ross Parnell‐Turner Earthquake Seismicity Reveals the Location and Significance of the Shona Mantle Plume in the South Atlantic Ocean |
topic_facet |
mantle plume mid‐ocean ridge southern Atlantic Ocean Geophysics. Cosmic physics QC801-809 |
description |
Abstract The South Atlantic Ocean hosts several well‐studied volcanic ridges and seamount chains, but the origin of their associated mantle plumes is debated. Reduced seismicity on the southern Mid‐Atlantic Ridge (MAR) suggests anomalously ductile thermomechanical conditions at 52°S and 47.5°S. These low seismicity patches extend 120–560 km along‐axis, and correspond with axial high spreading ridge morphology, geochemical anomalies, and mantle wave speed patterns likely associated with the Shona and Discovery plumes. Bathymetric data show that the northern extent of the Shona swell is associated with increased volcanism, elevated axial bathymetry, and a series of northward‐propagating rifts, with the overall swell geometry suggesting a buoyancy flux of 0.4–0.5 Mg s−1. The nearby Bouvet Island may be a product of a branch of the larger Shona plume swell, which has influenced crustal accretion on the southern MAR for the past 24 million years. |
format |
Article in Journal/Newspaper |
author |
Ross Parnell‐Turner |
author_facet |
Ross Parnell‐Turner |
author_sort |
Ross Parnell‐Turner |
title |
Earthquake Seismicity Reveals the Location and Significance of the Shona Mantle Plume in the South Atlantic Ocean |
title_short |
Earthquake Seismicity Reveals the Location and Significance of the Shona Mantle Plume in the South Atlantic Ocean |
title_full |
Earthquake Seismicity Reveals the Location and Significance of the Shona Mantle Plume in the South Atlantic Ocean |
title_fullStr |
Earthquake Seismicity Reveals the Location and Significance of the Shona Mantle Plume in the South Atlantic Ocean |
title_full_unstemmed |
Earthquake Seismicity Reveals the Location and Significance of the Shona Mantle Plume in the South Atlantic Ocean |
title_sort |
earthquake seismicity reveals the location and significance of the shona mantle plume in the south atlantic ocean |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1029/2024GL109738 https://doaj.org/article/c9e67effeb2f4a288195fd00b5fbadd3 |
genre |
Bouvet Island South Atlantic Ocean |
genre_facet |
Bouvet Island South Atlantic Ocean |
op_source |
Geophysical Research Letters, Vol 51, Iss 11, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2024GL109738 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL109738 https://doaj.org/article/c9e67effeb2f4a288195fd00b5fbadd3 |
op_doi |
https://doi.org/10.1029/2024GL109738 |
container_title |
Geophysical Research Letters |
container_volume |
51 |
container_issue |
11 |
_version_ |
1810437418400088064 |