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Shelf and open-ocean calcareous phytoplankton assemblages across the Paleocene-Eocene Thermal Maximum; implications for global productivity gradients

Samantha J. Gibbs, Timothy J. Bralower, Paul R. Bown, James C. Zachos and Laurel M. Bybell
Shelf and open-ocean calcareous phytoplankton assemblages across the Paleocene-Eocene Thermal Maximum; implications for global productivity gradients
Geology (Boulder) (April 2006) 34 (4): 233-236

Abstract

Abrupt global warming and profound perturbation of the carbon cycle during the Paleocene-Eocene Thermal Maximum (PETM, ca. 55 Ma) have been linked to a massive release of carbon into the ocean-atmosphere system. Increased phytoplankton productivity has been invoked to cause subsequent CO (sub 2) drawdown, cooling, and environmental recovery. However, interpretations of geochemical and biotic data differ on when and where this increased productivity occurred. Here we present high-resolution nannofossil assemblage data from a shelf section (the U.S. Geological Survey [USGS] drill hole at Wilson Lake, New Jersey) and an open-ocean location (Ocean Drilling Program [ODP] Site 1209, paleoequatorial Pacific). These data combined with published biotic records indicate a transient steepening of shelf-offshelf trophic gradients across the PETM onset and peak, with a decrease in open-ocean productivity coeval with increased nutrient availability in shelf areas. Productivity levels recovered in the open ocean during the later stages of the event, which, coupled with intensified continental weathering rates, may have played an important role in carbon sequestration and CO (sub 2) drawdown.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 34
Serial Issue: 4
Title: Shelf and open-ocean calcareous phytoplankton assemblages across the Paleocene-Eocene Thermal Maximum; implications for global productivity gradients
Affiliation: Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Pages: 233-236
Published: 200604
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 34
Accession Number: 2006-035329
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Depository Item 2006053
Illustration Description: illus. incl. sketch map
N39°39'38" - N39°39'38", W75°02'56" - W75°02'56"
N32°38'60" - N32°40'00", E158°30'00" - E158°31'00"
Secondary Affiliation: University College London, GBR, United KingdomUniversity of California at Santa Cruz, USA, United StatesU. S. Geological Survey, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200619
Program Name: USGSOPNon-USGS publications with USGS authors
Program Name: ODPOcean Drilling Program
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