Atlantic Paleogene biserial heterohelicid foraminifera and oxygen minima

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doi: 10.1029/PA004i003p00271
Author(s): Boersma, Anne; Premoli Silva, Isabella
Author Affiliation(s): Primary:
Microclimates, Stony Point, NY, United States
Univ. Milan, Italy
Volume Title: Paleoceanography
Source: Paleoceanography, 4(3), p.271-286. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 25 refs.; illus. incl. 4 tables, sketch map
Summary: Through most of the Paleogene the planktonic foraminifera called biserial heterohelicids record the most depleted carbon isotope ratios among planktonic foraminiferal species. They are interpreted to occupy an oxygen minimum habitat. Stronger interplanktonic carbon isotope contrasts and more enriched near surface carbon isotope values correspond to higher abundances of biserial heterohelicids. This group appears to have preferred latitudes and times when the oxygen minimum was well developed. Biserial heterohelicid generic and specific diversity are directly related to the interplanktonic carbon isotope contrast. Minimal specific diversity characterizes the Oligocene when interplanktonic and surface to bottom carbon isotope contrasts were consistently low. Diversity and abundance decreases were coeval with increased oceanic ventilation. Copyright 1989 by the American Geophysical Union.
Year of Publication: 1989
Research Program: DSDP Deep Sea Drilling Project
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Biochemistry; Biogeography; C-13/C-12; Carbon; Cenozoic; Cores; Faunal list; Foraminifera; Globigerinacea; Habitat; Heterohelicidae; Invertebrata; Isotopes; Marine environment; Marine sediments; Microfossils; O-18/O-16; Oxygen; Paleo-oceanography; Paleoclimatology; Paleoecology; Paleogene; Planktonic taxa; Protista; Rotaliina; Sediments; Stable isotopes; Stratigraphy; Tertiary
Record ID: 1990000266
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.

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