| Titre | Introduction: an Atlas of submarine glacial landforms |
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| Auteur | Dowdeswell, J A; Canals, M; Jakobsson, M; Todd, B J ; Dowdeswell, E K; Hogan, K A |
| Source | Atlas of submarine glacial landforms : Modern, Quaternary and Ancient; par Dowdeswell, J A (éd.); Canals, M (éd.); Jakobsson, M (éd.); Todd, B J (éd.); Dowdeswell, E K (éd.); Hogan, K A (éd.); Geological Society Memoir no. 46,
2016 p. 3-14, https://doi.org/10.1144/M46.171  Accès
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| Année | 2016 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20160282 |
| Éditeur | Geological Society of London |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1144/M46.171 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Sujets | topographie glaciaire |
| Illustrations | cartes de localisation; diagrammes; photographies; profils bathymétriques |
| Diffusé | 2016 11 30 |
| Résumé | (disponible en anglais seulement)
Glacial landforms and sediments exposed sub-aerially have been the subject of description, analysis and interpretation for more than a century (e.g. De Laski
1864; De Geer 1889). Indeed, such features provided important initial observations informing Louis Agassiz's ideas that ice was a key instrument in sculpting the landscape and that glaciers and ice sheets had extended to mid-latitudes during the
past, implying that Earth's climate must have changed considerably through time (Agassiz 1840). It is only in the last few decades that attention has begun to focus on the marine evidence for the past growth and decay of ice sheets that is recorded
in submarine landforms and sediments preserved on high-latitude continental margins. This interest has been driven, in part, by the recognition that sediments deposited below wave-base are often well preserved in the Quaternary geological record, and
may be less subject to erosion and reworking than their terrestrial counterparts. In addition, new marine-geophysical technologies have enabled increasingly high-resolution imaging and penetration of the high-latitude seafloor, most notably using
multibeam swath-bathymetric and three-dimensional (3D) seismic-reflection methods, and modern ice-strengthened and ice-breaking research vessels have allowed the effective deployment of these increasingly sophisticated instruments in the often
ice-infested waters of the Arctic and Antarctic seas.
The geological record from high-latitude continental margins is now recognized to provide key information on former ice-sheet extent, the direction and nature of past ice flow and dynamics,
and a well-preserved window on the detailed form and composition of former ice-sheet beds (e.g. Ottesen et al. 2005; Anderson et al. 2014; Jakobsson et al. 2014). The geometry and distribution of submarine glacial landforms on the seafloor, and the
underlying glacial-sedimentary stratigraphic record with which they are associated, is the topic of this volume. The aims and purpose of the Atlas are: (1) to provide a comprehensive set of examples of the full range of individual submarine glacial
landforms and assemblages of landforms produced beneath and at the marine margins of glaciers and ice sheets; and (2) to integrate this information over entire fjord-shelf-slope systems across the full climatic range of glacier-influenced marine
settings, in order to better understand the morphology and architecture of glacimarine environments. This evidence is used to reconstruct the growth, decay and dynamics of past ice sheets, including those of Quaternary and more ancient ice
ages. |
| Sommaire | (Résumé en langage clair et simple, non publié)
L'Atlas of Submarine Glacial Landforms présente un ensemble exhaustif de contributions provenant de chercheurs de nombreux pays, qui décrivent,
illustrent et présentent l'ensemble de la variabilité des formations que l'on trouve sur le fond marin en latitude élevée sous l'influence de glaciers. Les 180 contributions à l'Atlas sont organisées en fonction de leur position sur une marge
continentale, dans les formes suivantes : i) fjords, ii) plateaux et blocs continentaux, iii) talus et glacis continental, et bassins des grands fonds marins. |
| GEOSCAN ID | 299465 |
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