Ocean basin and depth variability of oxygen isotopes in Cenozoic benthic Foraminifera

Author(s): Moore, T. C., Jr.; Pisias, N. G.; Keigwin, Lloyd D., Jr.
Author Affiliation(s): Primary:
University of Rhode Island, Graduate School of Oceanography, Kingston, RI, United States
Volume Title: Cenozoic paleoceanography
Volume Author(s): Kennett, J. P., prefacer
Source: Cenozoic paleoceanography, prefaced by J. P. Kennett. Marine Micropaleontology, 6(5-6), p.465-481. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. NSF Grant OCE 79-14594. 37 refs.; illus., incl. 2 tables
Summary: As indicated by measurements on benthic foraminifera, the deep waters of the world ocean underwent an overall cooling of about 110 deg. C in the Cenozoic. It is evidenced by a few, relatively rapid increases in the O13 content of the benthic shells. These "steps" in the isotopic record are associated with major evolutionary changes in the mean state of the deep ocean. The variance around this mean state also changed through the Cenozoic. In the Late Miocene the benthic oxygen isotopes in Atlantic sites less than 3000 m deep have a higher variance than sites at similar depths in the Pacific and Indian Oceans. It is thought that this high variance results from long-term changes in the importance of the cool and salty North Atlantic Deep Water relative to that of the warmer and less saline Antarctic Intermediate Water at Atlantic sites between 100 m and 3000 m water depth. Such significant differences in benthic isotopic variance between the ocean basins have been demonstrated only in post-Middle Miocene intervals. (Auth. mod.)
Year of Publication: 1981
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Antarctic ice sheet; Antarctica; Assemblages; Atlantic Ocean; Benthic taxa; Caribbean Sea; Cenozoic; DSDP Site 116; DSDP Site 15; DSDP Site 157; DSDP Site 158; DSDP Site 206; DSDP Site 207; DSDP Site 208; DSDP Site 238; DSDP Site 281; DSDP Site 284; DSDP Site 289; DSDP Site 292; DSDP Site 296; DSDP Site 310; DSDP Site 329; DSDP Site 357; DSDP Site 366; DSDP Site 397; DSDP Site 398; DSDP Site 408; DSDP Site 44; DSDP Site 502; DSDP Site 503; DSDP Site 62; DSDP Site 71; DSDP Site 77; DSDP Site 83; DSDP Site 84; Deep Sea Drilling Project; East Pacific; Equatorial Atlantic; Equatorial Pacific; Falkland Plateau; Foraminifera; Glacial environment; Guatemala Basin; Hess Rise; IPOD; Indian Ocean; Invertebrata; Isotope ratios; Isotopes; Kyushu-Palau Ridge; Leg 12; Leg 16; Leg 21; Leg 24; Leg 29; Leg 3; Leg 30; Leg 31; Leg 32; Leg 36; Leg 39; Leg 41; Leg 47; Leg 49; Leg 6; Leg 68; Leg 7; Leg 8; Leg 9; Lord Howe Rise; Marine environment; Microfossils; Mid-Atlantic Ridge; New Caledonia Basin; North Atlantic; North Pacific; Northeast Pacific; Northwest Pacific; O-18/O-16; Ontong Java Plateau; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleoenvironment; Paleotemperature; Philippine Sea; Protista; Reykjanes Ridge; Rio Grande Rise; Rockall Plateau; Sierra Leone Rise; South Atlantic; South Pacific; South Tasman Rise; Southeast Pacific; Southwest Pacific; Stable isotopes; Tasman Sea; West Pacific
Coordinates: S014600 N063700 W0851400 W0855400
S365800 S320100 E1652700 E1652600
S563300 S512000 E1661100 E1600400
S013900 S012600 W1254900 W1275200
Record ID: 2009022797
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States