| Titre | Enigmatic deep-water mounds on the Orphan Knoll, Labrador Sea |
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| Auteur | Meredyk, S P; Edinger, E; Piper, D J W ; Huvenne, V A I; Hoy, S; Ruffman, A |
| Source | Frontiers in Marine Science vol. 6, 744, 2020 p. 1-23, https://doi.org/10.3389/fmars.2019.00744  Accès ouvert |
| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190257 |
| Éditeur | Frontiers Media |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.3389/fmars.2019.00744 |
| Media | en ligne; numérique |
| Formats | pdf |
| Province | Terre-Neuve-et-Labrador; Région extracotière de l'est |
| Région | Orphan Knoll; Océan Atlantique |
| Lat/Long OENS | -47.0000 -45.0000 51.5000 50.0000 |
| Sujets | caractéristiques sous-marines; topographie du fond océanique; morphologie; géologie du substratum rocheux; caractéristiques structurales; failles; failles en bloc; horsts; plans de litage; lithologie;
roches sédimentaires; calcaires; levés géophysiques; levés acoustiques marins; levés au sonar; sonar latéral; interprétations géophysiques; profils sismiques; photographie; échantillons prélevés au hasard; sédiments marins; boues; nodules; débris;
dépôts de glissement de terrain; blocs; antécédents tectoniques; soulèvement de la croûte; formation de failles; décrochement horizontal; mouvement de masse; microscopie des lames minces; analyses par diffraction des rayons x; Néogène; Miocène;
Paléogène; Eocene; Coraux; sédiments glaciomarins; Biologie; Enregistrement vidéo; géologie marine; géologie des dépôts meubles/géomorphologie; minéralogie; géophysique; Nature et environnement; Sciences et technologie; Phanérozoïque; Cénozoïque;
Quaternaire; Tertiaire |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; tableaux; photographies; photomicrographies; profils sismiques; histogrammes; graphiques en étoile; profils bathymétriques |
| Programme | Géoscience en mer |
| Diffusé | 2020 01 30 |
| Résumé | (disponible en anglais seulement)
Deep-sea mounds can have a variety of origins and may provide hard-substrate features in depths that are normally dominated by mud. Orphan Knoll, a 2 km high
bedrock horst off northeast Newfoundland, hosts more than 200 mounds, or mound complexes, of unknown composition, in water depths of 1720-2500 m. Most mounds are 10-600 m high, with average mound height 187 m, and 1-3 km wide. The study objective was
to characterize the size, shape, orientation, and composition of the enigmatic Orphan Knoll mounds, in order to determine their age and origin. Archival ship-based side-scan sonar, multibeam sonar, airgun, high-resolution sparker and 3.5 kHz acoustic
sub-bottom profiling, and newly acquired ship-based multibeam sonar, video transects by remotely operated vehicle (ROV), rock samples, and near-bottom multibeam sonar data were analyzed. Four mounds were studied during two ROV dives. Archival
sidescan sonar data show > 200 mounds. Sparker profiles show that the mound crests are covered by condensed stratified Quaternary sediment and airgun seismic data show faults reaching near the seafloor. New multibeam sonar data show mounds are
dominantly conical to elliptical in shape, but without preferred orientation or alignment. Remotely operated vehicle (ROV) transects and near-bottom multibeam showed that three mounds were rounded and symmetrically arranged, while a fourth was more
asymmetrical, with steep faces on the southwestern and southeastern flanks, where finely bedded to massive sedimentary bedrock outcropped dipping 15-45 SW. Rock samples from the mounds include Eocene calcareous ooze and mid-Miocene bedded pelagic
limestone. Thick ferromanganese crusts were found on many surfaces, obscuring possible outcrops from physical sampling. Polymetallic nodules were found on the slope of one mound. Ice-rafted detritus, including igneous and metamorphic rocks and
Paleozoic limestone and dolostone, was common in the sediments immediately surrounding the mounds. Quaternary sub-fossil solitary scleractinian corals accumulated over a span of at least 0.18 Ma at the base of one mound. The presence of uplifted
condensed Eocene-Miocene rocks on the mounds and faulting in seismic profiles suggest uplift during reactivation of old rift-related faults during the Neogene, with seabed mass wasting creating residual mounds, which were then draped by Quaternary
proglacial muds. Sculpting of hemipelagic Quaternary sediment by bottom currents probably contributed to mound morphology. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Un examen des monticules inusités du fond marin au sommet du dôme Orphan, y compris de leur origine géologique et de leurs répercussions sur le
biote. |
| GEOSCAN ID | 314869 |
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