Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge

The Gakkel Ridge in the Arctic Ocean and the Southwest Indian Ridge in the Southwest Indian Ocean between Africa and Antarctica are ultraslow-spreading (<20 mm yr-1) mid ocean ridges. This type of mid ocean ridge has distinct geo-morphologies that are influenced by the slow rate of plate divergen...

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Main Authors: Dorschel, Boris, Schlindwein, Vera, Eagles, Graeme
Format: Conference Object
Language:unknown
Published: 2014
Subjects:
Online Access:https://epic.awi.de/id/eprint/36551/
https://hdl.handle.net/10013/epic.44358
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spelling ftawi:oai:epic.awi.de:36551 2024-09-15T17:44:52+00:00 Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge Dorschel, Boris Schlindwein, Vera Eagles, Graeme 2014-12 https://epic.awi.de/id/eprint/36551/ https://hdl.handle.net/10013/epic.44358 unknown Dorschel, B. orcid:0000-0002-3495-5927 , Schlindwein, V. orcid:0000-0001-5570-2753 and Eagles, G. orcid:0000-0001-5325-0810 (2014) Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge , 2014 AGU Fall Meeting, San Francisco, 15 December 2014 - 19 December 2014 . hdl:10013/epic.44358 EPIC32014 AGU Fall Meeting, San Francisco, 2014-12-15-2014-12-19 Conference notRev 2014 ftawi 2024-06-24T04:11:05Z The Gakkel Ridge in the Arctic Ocean and the Southwest Indian Ridge in the Southwest Indian Ocean between Africa and Antarctica are ultraslow-spreading (<20 mm yr-1) mid ocean ridges. This type of mid ocean ridge has distinct geo-morphologies that are influenced by the slow rate of plate divergence and by mantle potential temperature, which control the processes (peridotite diapirism and intersticial melt migration) by which material rises to fill the space vacated by plate divergence. These ridges are characterised by non-orthogonal spreading. Transform faults, typical of faster spreading mid ocean ridges, are far less common at ultraslow spreading mid ocean ridges. Thus in return, detailed geo-statistical analyses of the geo-morphology of ultraslow-spreading mid ocean ridges can provide valuable information towards a better understanding of these slowest of spreading ridges. We have generated high resolution bathymetric grids for the Gakkel and Southwest Indian ridges based on high resolution multibeam echosounder data from various expeditions with RV Polarstern. On the basis of these grids, geo-statistical analyses allow for an assessment of the geo-morphological elements of the ridges on various scales. The results of these analyses show that, approximately 200 km long medium-scale sections of the ridges can be characterised by the lengths and orientations of the short-scale (hundreds of meters to tens of kilometres) ridges and troughs. The geo-morphologies of short-scale ridges and troughs situated at the junctions between medium scale sections often exhibit a mixture of the geo-morphological elements seen in the neighbouring sections. These geo-morphological patterns provide insights into the overall spreading-geometry along the Gakkel Ridge and the Southwest Indian Ridge. Conference Object Antarc* Antarctica Arctic Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id ftawi
language unknown
description The Gakkel Ridge in the Arctic Ocean and the Southwest Indian Ridge in the Southwest Indian Ocean between Africa and Antarctica are ultraslow-spreading (<20 mm yr-1) mid ocean ridges. This type of mid ocean ridge has distinct geo-morphologies that are influenced by the slow rate of plate divergence and by mantle potential temperature, which control the processes (peridotite diapirism and intersticial melt migration) by which material rises to fill the space vacated by plate divergence. These ridges are characterised by non-orthogonal spreading. Transform faults, typical of faster spreading mid ocean ridges, are far less common at ultraslow spreading mid ocean ridges. Thus in return, detailed geo-statistical analyses of the geo-morphology of ultraslow-spreading mid ocean ridges can provide valuable information towards a better understanding of these slowest of spreading ridges. We have generated high resolution bathymetric grids for the Gakkel and Southwest Indian ridges based on high resolution multibeam echosounder data from various expeditions with RV Polarstern. On the basis of these grids, geo-statistical analyses allow for an assessment of the geo-morphological elements of the ridges on various scales. The results of these analyses show that, approximately 200 km long medium-scale sections of the ridges can be characterised by the lengths and orientations of the short-scale (hundreds of meters to tens of kilometres) ridges and troughs. The geo-morphologies of short-scale ridges and troughs situated at the junctions between medium scale sections often exhibit a mixture of the geo-morphological elements seen in the neighbouring sections. These geo-morphological patterns provide insights into the overall spreading-geometry along the Gakkel Ridge and the Southwest Indian Ridge.
format Conference Object
author Dorschel, Boris
Schlindwein, Vera
Eagles, Graeme
spellingShingle Dorschel, Boris
Schlindwein, Vera
Eagles, Graeme
Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge
author_facet Dorschel, Boris
Schlindwein, Vera
Eagles, Graeme
author_sort Dorschel, Boris
title Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge
title_short Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge
title_full Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge
title_fullStr Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge
title_full_unstemmed Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge
title_sort geo-morphological analyses of the gakkel ridge and the southwest indian ridge
publishDate 2014
url https://epic.awi.de/id/eprint/36551/
https://hdl.handle.net/10013/epic.44358
genre Antarc*
Antarctica
Arctic Ocean
genre_facet Antarc*
Antarctica
Arctic Ocean
op_source EPIC32014 AGU Fall Meeting, San Francisco, 2014-12-15-2014-12-19
op_relation Dorschel, B. orcid:0000-0002-3495-5927 , Schlindwein, V. orcid:0000-0001-5570-2753 and Eagles, G. orcid:0000-0001-5325-0810 (2014) Geo-Morphological Analyses of the Gakkel Ridge and the Southwest Indian Ridge , 2014 AGU Fall Meeting, San Francisco, 15 December 2014 - 19 December 2014 . hdl:10013/epic.44358
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