GEOSCAN, résultats de la recherche


TitreImaging pockmarks and ring-like features in Hudson Bay from multibeam bathymetry data
AuteurRoger, J; Duchesne, M J; Lajeunesse, P; St-Onge, G; Pinet, N
SourceCommission géologique du Canada, Dossier public 6760, 2011, 19 pages, (Accès ouvert)
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
ProvinceRégion extracotière du nord
Lat/Long OENS-81.0000 -78.0000 63.2500 62.5000
Lat/Long OENS-86.0000 -82.0000 61.0000 59.0000
Lat/Long OENS-82.0000 -80.0000 56.0000 54.0000
Sujetsbathymétrie; sonar latéral; sédiments marins; sédiments marins; milieux marins; trous; topographie du fond océanique; topographie du fond océanique; hydrocarbures; capacité de production d'hydrocarbures; dépôts glaciaires; elements glaciaires; Plate-Forme d'Hudson ; géologie marine; géophysique; combustibles fossiles; géologie des dépôts meubles/géomorphologie; Cénozoïque; Quaternaire
Illustrationslocation maps; profiles
ProgrammeBassins sédimentaires d'Hudson / Foxe Bay, GEM : La géocartographie de l'énergie et des minéraux
Diffusé2011 02 21
Résumé(disponible en anglais seulement)
Multibeam bathymetry data collected in Hudson Bay in 2004, 2005, 2007 and 2010 during an ArcticNet cruises onboard the CCGS Amundsen show two sectors characterized by a high density of pockmarks and peculiar ring structures. The first sector is situated in northern Hudson Bay close to Mansel Island and is characterised by a ± 2 km long depression in which pockmarks with an average diameter of 100 m and an average depth of 10 m are present. The second sector is divided into two distinct parts; a northern domain characterized by a significant number of pockmarks and a southern one dominated by abundant circular ring-like features. The ring structures are < 200 m in diameter and 10 m deep and have a central peak. The occurrence of these features could be explained by salt doming that fractured bedrock. The occurrence of the ring structures and the pockmarks within the same area suggests that they might be process-related and that fluid escape may be an important characteristic for both types of morphological features. The very good state of preservation of both the pockmarks and the ring structures and the fact that they attenuate iceberg scours suggest that they have been formed recently (after deglaciation, i.e., after ~8500 years).