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Geissler, Wolfram H; Wintersteller, Paul; Strack, Anne; Kammann, Janina; Jegen, Marion; Maia, Marcia; Schloemer, Antje; Jokat, Wilfried (2019): GIS based analysis, processed sub bottom profiler, and composite grid and backscatter mosaics around Tristan da Cunha. PANGAEA, https://doi.org/10.1594/PANGAEA.906154

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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.
Supplement to:
Geissler, Wolfram H; Wintersteller, Paul; Maia, Marcia; Strack, Anne; Kammann, Janina; Eagles, Graeme; Jegen, Marion; Schloemer, Antje; Jokat, Wilfried (2020): Seafloor evidence for pre-shield volcanism above the Tristan da Cunha mantle plume. Nature Communications, 11, 4543, https://doi.org/10.1038/s41467-020-18361-4
Coverage:
Median Latitude: -28.423900 * Median Longitude: 16.468350 * South-bound Latitude: -33.906800 * West-bound Longitude: 14.503000 * North-bound Latitude: -22.941000 * East-bound Longitude: 18.433700
Size:
3 datasets

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