GEOSCAN, résultats de la recherche


TitreAtlas of submarine glacial landforms: modern, quaternary and ancient
AuteurDowdeswell, J A; Canals, M; Jakobsson, M; Todd, B J; Dowdeswell, E K; Hogan, K A
SourceAmerican Geophysical Union Fall Meeting, abstracts; 2014 p. 1
Séries alt.Secteur des sciences de la Terre, Contribution externe 20150188
ÉditeurAmerican Geophysical Union
RéunionAmerican Geophysical Union Fall Meeting; California; SF; décembre 15-19, 2014
Mediapapier; en ligne; numérique
Sujetstopographie; bathymétrie; marges continentales; géophysique
ProgrammeDivision de la CGC atlantique, Bureau du directeur
Résumé(disponible en anglais seulement)
In the past two decades there have been several advances that make the production of an atlas of submarine glacial landforms timely. First is the development of high-resolution imaging technologies; multi-beam echo-sounding or swath bathymetry that allows the detailed mapping of the sea floor at water depths of tens to thousands of metres across continental margins, and 3-D seismic methods that enable the visualisation of palaeo-continental shelves in Quaternary sediments and ancient palaeo-glacial rocks (e.g. Late Ordovician of Northern Africa). A second technological development is that of ice-breaking or ice-strengthened ships that can penetrate deep into the ice-infested waters of the Arctic and Antarctic, to deploy the multibeam systems. A third component is that of relevance - through both the recognition that the polar regions, and especially the Arctic, are particularly sensitive parts of the global environmental system and that these high-latitude margins (both modern and ancient) are likely to contain significant hydrocarbon resources. An enhanced understanding of the sediments and landforms of these fjord-shelf-slope systems is, therefore, of increasing importance to both academics and industry. We are editing an Atlas of Submarine Glacial Landforms that presents a series of individual contributions that describe, discuss and illustrate features on the high-latitude, glacier-influenced sea floor. Contributions are organised in two ways: first, by position on a continental margin - from fjords, through continental shelves to the continental slope and rise; secondly, by scale - as individual landforms and assemblages of landforms. A final section provides discussion of integrated fjord-shelf-slope systems. Over 100 contributions by scientists from many countries contain descriptions and interpretation of swath-bathymetric data from both Arctic and Antarctic margins and use 3D seismic data to investigate ancient glacial landforms. The Atlas will be published in late 2015 in the Memoir Series of the Geological Society of London.
Résumé(Résumé en langage clair et simple, non publié)
Les auteurs préparent un atlas de topographie des fonds marins glaciaires par une série de contributions individuelles qui décrivent, discutent et illustrent les caractéristiques du plancher océanique en hautes latitudes sous l'effet des glaciers. Un certain nombre de documents d'auteurs différents seront entrés dans l'IPP aux fins d'examen et d'approbation au cours des prochains mois.