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Seafloor evidence for pre-shield volcanism above the Tristan da Cunha mantle plume.
Geissler, Wolfram H., Wintersteller, Paul, Maia, Marcia, Strack, Anne, Kammann, Janina, Eagles, Graeme, Jegen, Marion , Schloemer, Antje and Jokat, Wilfried (2020) Seafloor evidence for pre-shield volcanism above the Tristan da Cunha mantle plume. Nature Communications, 11 (Art.Nr. 4543). DOI 10.1038/s41467-020-18361-4.
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Abstract
Tristan da Cunha is assumed to be the youngest subaerial expression of the Walvis Ridge hot spot. Based on new hydroacoustic data, we propose that the most recent hot spot volcanic activity occurs west of the island. We surveyed relatively young intraplate volcanic fields and scattered, probably monogenetic, submarine volcanoes with multibeam echosounders and sub-bottom profilers. Structural and zonal GIS analysis of bathymetric and backscatter results, based on habitat mapping algorithms to discriminate seafloor features, revealed numerous previously-unknown volcanic structures. South of Tristan da Cunha, we discovered two large seamounts. One of them, Isolde Seamount, is most likely the source of a 2004 submarine eruption known from a pumice stranding event and seismological analysis. An oceanic core complex, identified at the intersection of the Tristan da Cunha Transform and Fracture Zone System with the Mid-Atlantic Ridge, might indicate reduced magma supply and, therefore, weak plume-ridge interaction at present times.
Document Type: | Article |
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Research affiliation: | MARUM HGF-AWI OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics |
Refereed: | Yes |
Open Access Journal?: | Yes |
Publisher: | Nature Research |
Projects: | SPP 1375 |
Expeditions/Models/Experiments: | |
Date Deposited: | 14 Sep 2020 11:39 |
Last Modified: | 08 Feb 2023 09:44 |
URI: | https://oceanrep.geomar.de/id/eprint/50479 |
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