NE Atlantic benthic foraminifera; modern distribution patterns and palaeoecological significance

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doi: 10.1144/jgs.157.3.679
Author(s): Austin, W. E. N.; Evans, J. R.
Author Affiliation(s): Primary:
University of Durham, Department of Geography, Durham, United Kingdom
Volume Title: NE Atlantic palaeoceanography and climatic change
Volume Author(s): Rothwell, R. G., prefacer
Source: NE Atlantic palaeoceanography and climatic change, prefaced by R. G. Rothwell. Journal of the Geological Society of London, Vol.157(Part 3), p.679-691. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649 CODEN: JGSLAS
Note: In English. 61 refs.; illus., incl. 2 tables, sketch maps
Summary: Microfaunal evidence is presented from a region in the NE Atlantic Ocean characterized by well-constrained and very uniform physiochemical water mass properties, but a significant gradient in surface ocean productivity. Notable changes in the species composition of benthic foraminiferal assemblages can be directly related to surface productivity and particulate organic matter supply to the deep ocean floor. Because of the labile nature of much organic matter as it reaches the sea floor, it is argued that benthic foraminifera, which exhibit a high preservation potential in most marine sediments, provide a better proxy for estimating past fluxes than bulk sediment organic carbon (OC) content. Three distinct assemblage groups are recognized: a Cassidulina laevigata group which is dominated by infaunal species and a relatively high sediment OC content; a Rhizammina spp. group which is also dominated by infaunal species; and an Epistominella exigua group dominated by epifaunal taxa and falling sediment OC content. Significant faunal assemblage changes appear to be independent of grain size.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Algae; Arctic Ocean; Assemblages; Atlantic Ocean; Benthic taxa; Biogenic processes; Bjorn Drift; Calcium carbonate; Carbon; Cassidulina; Cassidulina laevigata; Cassidulinacea; Cenozoic; Coccolithophoraceae; Cores; Deep-water environment; Distribution; East Atlantic; Epistominella exigua; Foraminifera; Gardar Drift; Geochemistry; Geophysical surveys; Grain size; Hydrochemistry; Invertebrata; Leg 162; Marine methods; Marine sediments; Marine transport; Morphology; Nitrogen; North Atlantic; Norwegian Sea; ODP Site 983; ODP Site 984; Ocean Drilling Program; Organic carbon; Organic nitrogen; Paleo-oceanography; Paleoecology; Patterns; Physical properties; Planktonic taxa; Plantae; Pleistocene; Protista; Quaternary; Reykjanes Ridge; Rhizammina; Rotaliina; Salinity; Sediment transport; Sedimentation; Sedimentation rates; Sediments; Solutes; Surveys; Taxonomy; Upper Pleistocene
Coordinates: N550000 N630000 W0200000 W0300000
Record ID: 2000039682
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom