Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge?
Ultraslow spreadingmid-ocean ridges have a low magma budget and melt is distributed unevenly along the ridge axis. There is little or no basaltic crust between isolated magmatic centers. The processes that focus melts to segments of robust magmatism are not yet understood. During a seismic survey of...
Published in: | Geophysical Research Letters |
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ftawi:oai:epic.awi.de:33177 2024-09-15T18:09:43+00:00 Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge? Schlindwein, Vera Demuth, Andrea Geissler, Wolfram Jokat, Wilfried 2013 https://epic.awi.de/id/eprint/33177/ https://hdl.handle.net/10013/epic.41682 unknown AMER GEOPHYSICAL UNION Schlindwein, V. orcid:0000-0001-5570-2753 , Demuth, A. , Geissler, W. orcid:0000-0001-6807-555X and Jokat, W. orcid:0000-0002-7793-5854 (2013) Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge? , Geophysical Research Letters, 40 , pp. 1703-1707 . doi:10.1002/grl.50329 <https://doi.org/10.1002/grl.50329> , hdl:10013/epic.41682 EPIC3Geophysical Research Letters, AMER GEOPHYSICAL UNION, 40, pp. 1703-1707, ISSN: 0094-8276 Article isiRev 2013 ftawi 2024-06-24T04:07:26Z Ultraslow spreadingmid-ocean ridges have a low magma budget and melt is distributed unevenly along the ridge axis. There is little or no basaltic crust between isolated magmatic centers. The processes that focus melts to segments of robust magmatism are not yet understood. During a seismic survey of the ultraslow spreading Knipovich Ridge in the Norwegian-Greenland Sea with ocean bottom seismometers, we discovered a seismic gap in the upper mantle beneath Logachev Seamount, where micro-earthquakes clearly delineate a shallowing of the maximum depth of faulting. A topography of the lithosphere that allows melts to travel laterally along its base and rise in areas of thin lithosphere has been proposed as a possible mechanism to explain the focusing of melts at volcanic centers, but has never been confirmed observationally. Our results are the first geophysical evidence for an along-axis variation of the lithospheric thickness at an ultraslow spreading ridge. Article in Journal/Newspaper Greenland Greenland Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Geophysical Research Letters 40 9 1703 1707 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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unknown |
description |
Ultraslow spreadingmid-ocean ridges have a low magma budget and melt is distributed unevenly along the ridge axis. There is little or no basaltic crust between isolated magmatic centers. The processes that focus melts to segments of robust magmatism are not yet understood. During a seismic survey of the ultraslow spreading Knipovich Ridge in the Norwegian-Greenland Sea with ocean bottom seismometers, we discovered a seismic gap in the upper mantle beneath Logachev Seamount, where micro-earthquakes clearly delineate a shallowing of the maximum depth of faulting. A topography of the lithosphere that allows melts to travel laterally along its base and rise in areas of thin lithosphere has been proposed as a possible mechanism to explain the focusing of melts at volcanic centers, but has never been confirmed observationally. Our results are the first geophysical evidence for an along-axis variation of the lithospheric thickness at an ultraslow spreading ridge. |
format |
Article in Journal/Newspaper |
author |
Schlindwein, Vera Demuth, Andrea Geissler, Wolfram Jokat, Wilfried |
spellingShingle |
Schlindwein, Vera Demuth, Andrea Geissler, Wolfram Jokat, Wilfried Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge? |
author_facet |
Schlindwein, Vera Demuth, Andrea Geissler, Wolfram Jokat, Wilfried |
author_sort |
Schlindwein, Vera |
title |
Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge? |
title_short |
Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge? |
title_full |
Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge? |
title_fullStr |
Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge? |
title_full_unstemmed |
Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge? |
title_sort |
seismic gap beneath logachev seamount: indicator for melt focusing at an ultraslow mid-ocean ridge? |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/33177/ https://hdl.handle.net/10013/epic.41682 |
genre |
Greenland Greenland Sea |
genre_facet |
Greenland Greenland Sea |
op_source |
EPIC3Geophysical Research Letters, AMER GEOPHYSICAL UNION, 40, pp. 1703-1707, ISSN: 0094-8276 |
op_relation |
Schlindwein, V. orcid:0000-0001-5570-2753 , Demuth, A. , Geissler, W. orcid:0000-0001-6807-555X and Jokat, W. orcid:0000-0002-7793-5854 (2013) Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge? , Geophysical Research Letters, 40 , pp. 1703-1707 . doi:10.1002/grl.50329 <https://doi.org/10.1002/grl.50329> , hdl:10013/epic.41682 |
container_title |
Geophysical Research Letters |
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40 |
container_issue |
9 |
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1703 |
op_container_end_page |
1707 |
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1810447309302923264 |