Palaeoclimatic control of upper Pliocene Discoaster assemblages in the North Atlantic

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doi: 10.1144/jm.9.2.133
Author(s): Chepstow-Lusty, Alex; Backman, Jan; Shackleton, Nicholas J.
Author Affiliation(s): Primary:
University of Cambridge, Godwin Laboratory, Cambridge, United Kingdom
University of Stockholm, Sweden
Volume Title: Cenozoic biostratigraphy and global change
Volume Author(s): Funnell, Brian M., editor
Source: Journal of Micropalaeontology, 9(2), p.133-143; British Micropalaeontological Society meeting on Cenozoic biostratigraphy and global change, Norwich, United Kingdom, May 1989, edited by Brian M. Funnell. Publisher: British Micropalaeontological Society, London, United Kingdom. ISSN: 0262-821X
Note: In English. 12 refs.; illus., incl. 1 plate, 3 tables, sketch map
Summary: Abundance variations of six Pliocene species of the nannofossil genus Discoaster were analyzed over the time interval 1.89-2.95 Ma at five sites in the North Atlantic; DSDP 552 (56°N), DSDP 607 (41°N), ODP 659 (18°N), ODP 658 (20°N) and ODP 662 (1°S). Individual species are compared between the five sites as a percentage of the total Discoaster assemblage, using age models based mainly on Discoaster datums (3 control points used at each site). The sampling interval is approximately 3 kyrs. Discoaster brouweri, the only species covering the complete time interval became a less significant component of the assemblages with increasing latitude during the interval prior to 2.3 Ma. Discoaster triradiatus shows a distinct abundance acme at all sites between 1.89-2.7 Ma. Discoaster surculus increased in relative abundance with higher latitudes and upwelling conditions (ODP Site 658). Discoaster pentaradiatus is an important component of the assemblages at all sites, but displays an inverse abundance relationship with D. surculus as a function of increasing latitude and upwelling conditions. Discoaster tamalis and Discoaster asymmetricus are reduced at low latitudes and in upwelling conditions and increase relative to D. brouweri at higher latitudes, where there is strong evidence for taxonomic affinity.
Year of Publication: 1991
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atlantic Ocean; Biogeography; Cape Verde Rise; Cenozoic; DSDP Site 552; DSDP Site 607; Deep Sea Drilling Project; Discoaster; Discoasteridae; Equatorial Atlantic; IPOD; Leg 108; Leg 81; Leg 94; Marine environment; Microfossils; Mid-Atlantic Ridge; Morphology; Nannofossils; Neogene; North Atlantic; Northeast Atlantic; ODP Site 658; ODP Site 659; ODP Site 662; Ocean Drilling Program; Paleo-oceanography; Paleoclimatology; Paleoecology; Paleoenvironment; Plantae; Pliocene; Rockall Plateau; Sedimentation; Sedimentation rates; South Atlantic; Tertiary; Upper Pliocene; Upwelling
Coordinates: N180437 N204457 W0183451 W0210135
N560233 N560234 W0231323 W0231324
N410004 N410005 W0325726 W0325727
S012325 S012324 W0114421 W0114421
Record ID: 2015014533
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom