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Atmospheric pCO (sub 2) since 60 Ma from records of seawater pH, calcium, and primary carbonate mineralogy

Robert V. Demicco, Tim K. Lowenstein and Lawrence A. Hardie
Atmospheric pCO (sub 2) since 60 Ma from records of seawater pH, calcium, and primary carbonate mineralogy
Geology (Boulder) (September 2003) 31 (9): 793-796

Abstract

A 60 m.y. record of atmospheric pCO (sub 2) has been refined from knowledge of (1) secular changes in the major ion composition of seawater (particularly Ca and Mg) and (2) oscillations in the mineralogy of primary oceanic carbonate sediments. Both factors have had a significant impact on the chemistry of the ocean carbonate buffer system. Calculated atmospheric pCO (sub 2) oscillated between values of 100-300 ppm and to maxima of 1200-2500 ppm from 60 to 40 Ma and varied between 100 and 300 ppm from 25 Ma to the present. The refined pCO (sub 2) values are significantly lower than previous estimates made from seawater pH data where total dissolved inorganic carbon was assumed constant and more in line with modeling and stomatal index estimations of atmospheric pCO (sub 2) for the Tertiary.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 31
Serial Issue: 9
Title: Atmospheric pCO (sub 2) since 60 Ma from records of seawater pH, calcium, and primary carbonate mineralogy
Affiliation: State University of New York at Binghamton, Department of Geological Sciences, Binghamton, NY, United States
Pages: 793-796
Published: 200309
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 27
Accession Number: 2003-063127
Categories: StratigraphyGeneral geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Johns Hopkins University, Baltimore, Maryland 21218, 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: 200320
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