Physiography of the Ampère Seamount in the Horseshoe Seamount chain off Gibraltar
The Ampère Seamount, 600 km west of Gibraltar, is one of nine inactive volcanoes along a bent chain, the so called Horseshoe Seamounts. All of them ascend from an abyssal plain of 4000 to 4800 m depth up to a few hundred meters below the sea surface, except two, which nearly reach the surface: the A...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.341125 2023-05-15T14:26:29+02:00 Physiography of the Ampère Seamount in the Horseshoe Seamount chain off Gibraltar Hatzky, Jörn LATITUDE: 35.116667 * LONGITUDE: -12.916667 2005-12-20 application/zip, 3.1 MBytes https://doi.pangaea.de/10.1594/PANGAEA.341125 https://doi.org/10.1594/PANGAEA.341125 en eng PANGAEA Hatzky, Jörn (2005): Ampère Seamount (Sect. 5.2.6). Arctic Ocean and Its Constituent Seas; Bathymetry and Physiography (Sect. 5.4.1). The Orca Seamount Region, Antarctica (Sect. 5.5.2). In: Peter C. Wille (ed.), Sound Images of the Ocean in Research and Monitoring, Springer-Verlag Berlin Heidelberg New York, 471 pp Hatzky, Jörn (2005): Ampère Seamount (Sect. 5.2.6, pp. 131-132). Arctic Ocean and Its Constituent Seas; Bathymetry and Physiography (Sect. 5.4.1, pp. 202-206). The Orca Seamount Region, Antarctica (Sect. 5.5.2, pp. 222-223). In Wille, Peter C. "Sound Images of the Ocean in Research and Monitoring", Springer-Verlag, Berlin Heidelberg New York, hdl:10013/epic.23498.d001 https://doi.pangaea.de/10.1594/PANGAEA.341125 https://doi.org/10.1594/PANGAEA.341125 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven Ampere_Seamount ANT-IX/4 AWI_Paleo Horseshoe Area HS HydroSweep Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS18 Dataset 2005 ftpangaea https://doi.org/10.1594/PANGAEA.341125 2023-01-20T08:06:02Z The Ampère Seamount, 600 km west of Gibraltar, is one of nine inactive volcanoes along a bent chain, the so called Horseshoe Seamounts. All of them ascend from an abyssal plain of 4000 to 4800 m depth up to a few hundred meters below the sea surface, except two, which nearly reach the surface: the Ampère massif on the southern flank of the group and the summit of the Gorringe bank in the north. The horseshoe, serrated like a crown, opens towards Gibraltar and stands in the way of its outflow. These seamounts are part of the Azores-Gibraltar structure, which marks the boundary between two major tectonic plates: the Eurasian and the African plate. The submarine volcanism which formed the Horseshoe Seamounts belongs to the sea floor spread area of the Mid-Atlantic Ridge. The maximum activity was between 17 and 10 Million years ago and terminated thereafter. The volcanoes consist of basalts and tuffs. Most of their flanks and the abyssal plain around are covered by sediments of micro-organic origin. These sediments, in particular their partial absence on the upper flanks are a circumstantial proof and a kind of diary of the initial rise and subsequent subsidence of about 6oo m of these seamounts. The horizons of erosion where the basalt substrate is laid bare indicate the rise above sea level in the past. Since the Ampère summit is 60 m deep today, this volcano must have been an island 500 m high. The stratification of the sediments covering the surrounding abyssal plain reveals discrete events of downslope suspension flows, called turbidites, separated by tens of thousands of years and perhaps induced by changes in climate conditions. The Ampère sea mount of 4800 m height and a base diameter of 50 km exceeds the size of the Mont Blanc massif. Its southern and eastern flanks are steep with basalts cropping out, in parts with nearly vertical walls of some hundred meters. The west and north sides consist of terraces and plateaus covered with sediments at 140 m, 400 m, 2000 m, and 3500 m. The Horseshoe Seamount area is ... Dataset Arctic PANGAEA - Data Publisher for Earth & Environmental Science Mid-Atlantic Ridge Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) ENVELOPE(-12.916667,-12.916667,35.116667,35.116667) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Ampere_Seamount ANT-IX/4 AWI_Paleo Horseshoe Area HS HydroSweep Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS18 |
spellingShingle |
Ampere_Seamount ANT-IX/4 AWI_Paleo Horseshoe Area HS HydroSweep Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS18 Hatzky, Jörn Physiography of the Ampère Seamount in the Horseshoe Seamount chain off Gibraltar |
topic_facet |
Ampere_Seamount ANT-IX/4 AWI_Paleo Horseshoe Area HS HydroSweep Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS18 |
description |
The Ampère Seamount, 600 km west of Gibraltar, is one of nine inactive volcanoes along a bent chain, the so called Horseshoe Seamounts. All of them ascend from an abyssal plain of 4000 to 4800 m depth up to a few hundred meters below the sea surface, except two, which nearly reach the surface: the Ampère massif on the southern flank of the group and the summit of the Gorringe bank in the north. The horseshoe, serrated like a crown, opens towards Gibraltar and stands in the way of its outflow. These seamounts are part of the Azores-Gibraltar structure, which marks the boundary between two major tectonic plates: the Eurasian and the African plate. The submarine volcanism which formed the Horseshoe Seamounts belongs to the sea floor spread area of the Mid-Atlantic Ridge. The maximum activity was between 17 and 10 Million years ago and terminated thereafter. The volcanoes consist of basalts and tuffs. Most of their flanks and the abyssal plain around are covered by sediments of micro-organic origin. These sediments, in particular their partial absence on the upper flanks are a circumstantial proof and a kind of diary of the initial rise and subsequent subsidence of about 6oo m of these seamounts. The horizons of erosion where the basalt substrate is laid bare indicate the rise above sea level in the past. Since the Ampère summit is 60 m deep today, this volcano must have been an island 500 m high. The stratification of the sediments covering the surrounding abyssal plain reveals discrete events of downslope suspension flows, called turbidites, separated by tens of thousands of years and perhaps induced by changes in climate conditions. The Ampère sea mount of 4800 m height and a base diameter of 50 km exceeds the size of the Mont Blanc massif. Its southern and eastern flanks are steep with basalts cropping out, in parts with nearly vertical walls of some hundred meters. The west and north sides consist of terraces and plateaus covered with sediments at 140 m, 400 m, 2000 m, and 3500 m. The Horseshoe Seamount area is ... |
format |
Dataset |
author |
Hatzky, Jörn |
author_facet |
Hatzky, Jörn |
author_sort |
Hatzky, Jörn |
title |
Physiography of the Ampère Seamount in the Horseshoe Seamount chain off Gibraltar |
title_short |
Physiography of the Ampère Seamount in the Horseshoe Seamount chain off Gibraltar |
title_full |
Physiography of the Ampère Seamount in the Horseshoe Seamount chain off Gibraltar |
title_fullStr |
Physiography of the Ampère Seamount in the Horseshoe Seamount chain off Gibraltar |
title_full_unstemmed |
Physiography of the Ampère Seamount in the Horseshoe Seamount chain off Gibraltar |
title_sort |
physiography of the ampère seamount in the horseshoe seamount chain off gibraltar |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.341125 https://doi.org/10.1594/PANGAEA.341125 |
op_coverage |
LATITUDE: 35.116667 * LONGITUDE: -12.916667 |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) ENVELOPE(-12.916667,-12.916667,35.116667,35.116667) |
geographic |
Mid-Atlantic Ridge Mont Blanc |
geographic_facet |
Mid-Atlantic Ridge Mont Blanc |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven |
op_relation |
Hatzky, Jörn (2005): Ampère Seamount (Sect. 5.2.6). Arctic Ocean and Its Constituent Seas; Bathymetry and Physiography (Sect. 5.4.1). The Orca Seamount Region, Antarctica (Sect. 5.5.2). In: Peter C. Wille (ed.), Sound Images of the Ocean in Research and Monitoring, Springer-Verlag Berlin Heidelberg New York, 471 pp Hatzky, Jörn (2005): Ampère Seamount (Sect. 5.2.6, pp. 131-132). Arctic Ocean and Its Constituent Seas; Bathymetry and Physiography (Sect. 5.4.1, pp. 202-206). The Orca Seamount Region, Antarctica (Sect. 5.5.2, pp. 222-223). In Wille, Peter C. "Sound Images of the Ocean in Research and Monitoring", Springer-Verlag, Berlin Heidelberg New York, hdl:10013/epic.23498.d001 https://doi.pangaea.de/10.1594/PANGAEA.341125 https://doi.org/10.1594/PANGAEA.341125 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.341125 |
_version_ |
1766299068554805248 |