Recent Foraminifera in the Canadian Arctic

Vilks, G

doi:10.2307/1484859

Cited by 96 publications

(66 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A comparison of the present study with investigations such as those by VILKS (1969) andLOEBLICH andTAPPAN (1953), notably with respect to benthic foraminifera, shows that many of the foraminifer species of the present study are rare in comparison with the observations made by VILKS (1969) in the middle Arctic. Shallow water faunas in the Canadian Arctic are dominated by agglutinated species (VILKS, 1969), whereas these species are extremely rare in the present study.…”

Section: Mya Truncata (Unit 4supporting

confidence: 70%

See 1 more Smart Citation

Marine Regression and Palaeoenvironments During the Holocene in the Richardson River Basin, District of Mackenzie, N.W.T.

Kerr¹

2007

gpq

View full text Add to dashboard Cite

A detailed stratigraphie analysis was carried out on a river-bank section of late Quaternary marine sediments in the Richardson River Basin, N.W.T. The sedimentary sequence represents a gradual shallowing of the sea in an estuarine environment, from a relatively shallow marine faciès to an intertidal environment. The withdrawal of the sea from the Richardson River Basin began prior to 10,300 years BP. Isostatic uplift caused the gradual regression of the sea to its present-day level. The marine sediments yielded 26 ostracode and 14 foraminifer species. Faunal evidence is indicative of brackish-water marginal marine conditions resulting from the dilution of nearshore marine waters by freshwater discharge from the many streams and rivers draining the basin of the Richardson River.Nous avons effectué une étude détaillée d'une coupe stratigraphique de dépôts marins dans le bassin de la rivière Richardson, T.-N.-O. La séquence sédimentaire étudiée représente une régression marine dans un milieu estuarien. Elle débute par un faciès marin mis en place en eau peu profonde et évolue vers un faciès intertidal. Le retrait de la mer dans ce bassin a commencé avant 10 300 ans BP. Le relèvement isostatique terrestre est responsable de la régression marine graduelle jusqu'à son niveau actuel. Les sédiments marins contiennent 26 espèces d'ostracodes et 14 espèces de foraminifères; cette microfaune témoigne de conditions marines marginales d'eaux saumâtres résultant de la dilution de l'eau marine littorale par un apport d'eau douce des rivières drainant le bassin de la rivière Richardson

show abstract

Section: Mya Truncata (Unit 4supporting

confidence: 70%

“…Shallow water faunas in the Canadian Arctic are dominated by agglutinated species (VILKS, 1969), whereas these species are extremely rare in the present study. Finally, the present study is characterized by a benthic foraminiferal fauna distinct in many ways from that of more open marine environments (LOEBLICH and TAPPAN, 1953).…”

Section: Mya Truncata (Unit 4contrasting

confidence: 58%

Marine Regression and Palaeoenvironments During the Holocene in the Richardson River Basin, District of Mackenzie, N.W.T.

Kerr¹

2007

gpq

View full text Add to dashboard Cite

show abstract

“…Recent work by Hunt and Corliss (1993) supports earlier work of Vilks (1969) that the benthic foraminiferal assemblages in the Archipelago are related to the Arctic and Atlantic water masses. Arctic water supports agglutinated assemblages and Atlantic water supports calcareous assemblages.…”

Section: Benthic Foraminiferasupporting

confidence: 68%

“…8) Short et al, 1994). Vilks et al (1969) inferred that the sills in the western archipelago were deeper due to isostatic loading and the Atlantic water from the Arctic Ocean flowed into the Diaz et al, 1989, fig. 7).…”

Section: Barrow Strait and Strathcona Soundmentioning

confidence: 99%

The Eastern Canadian Arctic at ca. 6 ka BP: A Time of Transition

Williams¹,

Short²,

Andrews³

et al. 2007

gpq

View full text Add to dashboard Cite

The middle Holocene was a time of definite environmental transition in the Eastern Canadian Arctic. Based on several proxy indicators (pollen, diatoms, foraminifera, molluscs and nearshore sedimentation rates), it appears that a thermal maximum occurred around middle Holocene (6-4 ka), several thousand years after the insolation maximum — a lag caused by the thermal inertia of the earlier massive ice sheet. Terrestrial records indicate that a warming began around 6 ka, both in the subarctic (Labrador - Ungava) and on Baffin Island. Marine records, on the other hand, suggested major water structure changes around 6 ka both in the Northeastern Canadian Arctic and also along the East Greenland coast with evidence of a marine surface water temperature maximum at 8 ka. We hypothesize that the marine circulation changes, both along the Baffin Island and along the East Greenland coasts, were primarily driven by glacio-isostatic uplift of the Arctic Channels. With the cessation of water flow of Atlantic (warmer) origin, and decrease in water volume from the deeper parts of the Arctic Ocean through the Arctic Channels, the export through the Fram and Denmark straits increased and the water column changed. Changes in the concentration and duration of sea ice along the eastern Canadian coast would have had important repercussions on the biota of the coastal marine and terrestrial ecosystems.L'Holocène moyen a été une période de transition bien déterminée dans l'est de l'Arctique canadien. Selon de nombreux indicateurs (pollen, diatomées, foraminifères, mollusques et taux de sédimentation côtiers), il semble qu'un maximum thermique ait été atteint vers le milieu de l'Holocène (6-4 ka), plusieurs milliers d'années après le maximum d'insolation — un retard dû à l'inertie thermique causée par la présence de l'immense inlandsis. Les données terrestres démontrent qu'un réchauffement s'est amorcé vers 6 ka, à la fois dans le subarctique (Labrador, Ungava) et dans l'île de Baffin. Les données marines, d'autre part, indiquent qu'il y a eu des changements de structure de l'eau vers 6 ka à la fois dans le nord-est de l'Arctique canadien et le long de la côte du Groenland avec des indices de températures maximales marines de surface à 8 ka. Nous posons l'hypothèse selon laquelle les changements de circulation marine, à la fois le long de l'île de Baffin et le long de la côte est du Groenland ont été provoqués par le relèvement isostatique des chenaux arctiques. Avec l'arrêt de l'écoulement (plus chaud) en provenance de l'Atlantique et la diminution du cubage d'eau provenant des grandes profondeurs de l'océan Arctique dans les chenaux arctiques, l'évacuation par les détroits de Fram et du Danemark s'est accrue et la colonne d'eau s'est modifiée. Les changements de concentration et de durée de la glace marine le long de la côte est du Canada auraient eu d'importantes répercussions sur les écosystèmes marins côtiers et terrestres.Das mittlere Holozân war eine eindeutige Umwelt-Ùbergangszeit in der ostkanadischen Arktis. Gestùtzt auf zahlr...

show abstract

“…Scott and Vilks (1991) reported similar results from the Yermak Plateau in the Arctic Ocean and proposed that the absence of calcareous species from some parts of the Arctic shelf is due to the presence of corrosive water that inhibits secretion of calcareous tests, as well as removing any calcium carbonate present in the water column before it can accumulate in sediments. The absence of calcareous foraminifera on the Yermak Plateau is unusual because most of the Arctic shelf is characterized by mixed faunas that contain both calcareous and agglutinated species (Phleger, 1952;Loeblich and Tappan, 1953;Vilks, 1969;Lagoe, 1977;Wollenburg, 1992). Other areas in the Arctic where carbonate dissolution is an important factor are the Laptev Sea (Wollenburg and Kuhnt, 2000), the Fram Basin (Scott and Vilks, 1991), and areas of the western Canadian Archipelago (Vilks, 1989).…”

Section: Discussionmentioning

confidence: 99%

Response of Recent Benthic Foraminiferal Assemblages to Contrasting Environments in Baffin Bay and the Northern Labrador Sea, Northwest Atlantic

Schröder-Adams¹,

Rooyen²

2011

ARCTIC

View full text Add to dashboard Cite

ABSTRACT. Modern deep-water benthic foraminiferal assemblages in Baffin Bay and the northern Labrador Sea, Western North Atlantic, were sampled from box cores and analyzed to determine assemblage composition. The two marine basins are separated by the shallow waters of Davis Strait. Assemblages of Baffin Bay contained only agglutinated foraminifera, whereas samples from the Labrador Sea contained both calcareous and agglutinated species, which resulted in significantly higher species richness. The absence of benthic calcareous taxa in Baffin Bay is attributed to cold, saline, CO 2 -rich bottom waters related to the Baffin Bay Bottom Water and the Baffin Bay Atlantic Water. Modern foraminiferal assemblage distribution supports the model of increased organic flux under seasonal open-water conditions that feed a rich agglutinated assemblage, but lead to oxidation of organic matter and increased carbonate dissolution. Deep-water sediments contain ice-rafted coarsegrained components and biogenic elements such as sponge spicules that are heavily used by numerous agglutinated species for test construction. Robust, tubular suspension feeders occupy regions under the influence of bottom currents that deliver nutrients. Although disturbances of the sediment-water interface cannot be excluded with sampled box cores, small-scale patchiness can be confirmed by varying abundances of infaunal taxa. Absolute counts of specimens in subsamples vary significantly, whereas species evenness among subsamples is less variable. These findings call for caution when interpreting lateral faunal changes on the basis of small core samples.Key words: benthic foraminifera, Baffin Bay, Labrador Sea, carbonate dissolution, faunal patchiness RÉSUMÉ. Nous avons échantillonné des assemblages modernes de foraminifères benthiques d'eau profonde prélevés dans la baie de Baffin et le nord de la mer du Labrador, Atlantique du Nord-Ouest, à partir de carottes à boîte, puis nous les avons analysés afin d'en déterminer la composition. Les deux bassins marins sont séparés par les eaux peu profondes du détroit de Davis. Les assemblages de la baie de Baffin ne renfermaient que des foraminifères agglutinants, tandis que les échantillons de la mer du Labrador contenaient à la fois des espèces calcaires et des espèces agglutinantes, ce qui a donné lieu à une richesse d'espèces considérablement supérieure. L'absence de taxons calcaires benthiques dans la baie de Baffin s'explique par la présence d'eau de fond froide, saline et riche en CO 2 provenant de l'eau de fond de la baie de Baffin et de l'eau atlantique de la baie de Baffin. La répartition des assemblages foraminifères modernes cadre avec le modèle du flux organique accru moyennant des conditions saisonnières en eaux libres qui alimentent un riche assemblage agglutinant, mais qui se traduisent par l'oxydation de la matière organique et l'intensification de la dissolution du carbonate. Les sédiments en eau profonde contiennent des composantes glacielles à grains grossiers et des éléments biogènes tels que ...

show abstract

Recent Foraminifera in the Canadian Arctic

Cited by 96 publications

References 6 publications

Marine Regression and Palaeoenvironments During the Holocene in the Richardson River Basin, District of Mackenzie, N.W.T.

Marine Regression and Palaeoenvironments During the Holocene in the Richardson River Basin, District of Mackenzie, N.W.T.

The Eastern Canadian Arctic at ca. 6 ka BP: A Time of Transition

Response of Recent Benthic Foraminiferal Assemblages to Contrasting Environments in Baffin Bay and the Northern Labrador Sea, Northwest Atlantic

Contact Info

Product

Resources

About