Palaeoecological preferences and geographical distribution of late Maastrichtian deep-sea ostracods in the South Atlantic

Author(s): Majoran, Stefan; Widmark, Joen G. V.; Kucera, Michal
Author Affiliation(s): Primary:
Göteborg University, Department of Marine Geology, Goteborg, Sweden
Volume Title: Lethaia
Source: Lethaia, 30(1), p.53-64. Publisher: Universitetsforlaget, Oslo, International. ISSN: 0024-1164 CODEN: LETHAT
Note: In English. 55 refs.; illus., incl. 1 plate, 7 tables, sketch maps
Summary: The distributional patterns of deep-sea ostracods in the terminal Cretaceous South Atlantic were examined from seven DSDP/ODP holes. Many of the genera recorded in this study are previously known from Campanian-Maastrichtian deep-sea sediments. However, the recovery of Aversovalva, Hemiparacytheridea, Profundobythere, Mayburya and Legitimocythere reveals considerable similarities with the Tertiary deep-sea ostracod fauna of the Pacific and the North Atlantic. The underlying causes controlling the variation in faunal density among the various sites are likely to be related to variation in food supply and, to a lesser extent, to variation in oxygen levels. A Q-mode principal component analysis with varimax rotation yielded a first component largely dominated by Brythocypris and significantly correlated with paleotemperature. The second component is largely dominated by Krithe and significantly correlated with paleotemperature and paleodepth. Among the sites studied, Krithe is most common at Site 356, where the paleotemperature was around 15°C; today, most representatives of this genus are psychrospheric and adapted to temperatures below 10°C. (Auth. mod.)
Year of Publication: 1997
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; Arthropoda; Atlantic Ocean; Biogeography; Cretaceous; Crustacea; DSDP Site 356; DSDP Site 525; DSDP Site 527; DSDP Site 528; DSDP Site 529; Deep Sea Drilling Project; Deep-sea environment; IPOD; Invertebrata; Leg 113; Leg 114; Leg 39; Leg 74; Maestrichtian; Mandibulata; Marine environment; Mesozoic; Microfossils; ODP Site 689; ODP Site 698; Ocean Drilling Program; Ocean circulation; Ostracoda; Oxygen; Paleo-oceanography; Paleoecology; Sea water; Senonian; South Atlantic; Temperature; Upper Cretaceous
Coordinates: S704954 S614837 E0030559 W0432706
S515905 S465245 E0075341 W0330558
S301000 S280000 E0031000 E0014500
Record ID: 1998007229
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States