Terminal Cretaceous warming event in the mid-latitude South Atlantic Ocean; evidence from poleward migration of Contusotruncana contusa (planktonic Foraminifera) morphotypes

Author(s): Kucera, Michal; Malmgren, Bjorn A.
Author Affiliation(s): Primary:
University of Goteborg, Department of Marine Geology, Goteborg, Sweden
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 138(1-4), p.1-15. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 39 refs.; illus., incl. 3 tables
Summary: Spatial and temporal patterns in test size and shape (test conicity and spiral roundness) and absolute abundance (accumulation rate) of the planktonic foraminifer Contusotruncana contusa were studied in the South Atlantic Ocean (DSDP sites 356, 516, 525 and 527) during an interval corresponding to the last 800 kyr of the Cretaceous. The variation in absolute abundance of C. contusa was characterised by alternating periods of high and low abundance; some of these periods were traceable across the entire mid-latitude South Atlantic Ocean. While the mean spiral roundness did not show any interpretable patterns, a sudden increase of the mean test size and mean test conicity occurred between 65.3 and 65.2 Ma (based on linear interpolation within the Cretaceous part of Subchron C29R) at all sites studied, indicating a poleward migration followed by rapid withdrawal of the low-latitude C. contusa morphotypes from the mid-latitude South Atlantic Ocean. We suggest that this event was caused by a short period of surface-water warming in the southern mid-latitudes corresponding to the brief high-latitude warming event and associated faunal migrations in the Boreal and Austral realms. Abstract Copyright (1998) Elsevier, B.V.
Year of Publication: 1998
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 10 Paleontology, Invertebrate; 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Bioclastic sedimentation; Biogeography; Biomass; Contusotruncana; Contusotuncana contusa; Cores; Cretaceous; DSDP Site 356; DSDP Site 384; DSDP Site 516; DSDP Site 525; DSDP Site 527; Deep Sea Drilling Project; Foraminifera; IPOD; Invertebrata; Leg 39; Leg 43; Leg 72; Leg 74; Marine environment; Marine sediments; Mesozoic; Microfossils; Migration; Morphology; Paleoclimatology; Paleoecology; Paleotemperature; Planktonic taxa; Productivity; Protista; Sedimentation; Sedimentation rates; Sediments; South Atlantic; Upper Cretaceous; Variations
Coordinates: N310000 N410000 W0510000 W0680000
S302000 S261000 W0351500 W0381000
S301000 S280000 E0031000 E0014500
Record ID: 1998032134
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands