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Linking phosphogenic episodes on the Southeast U.S. margin to marine delta (super 13) C and delta (super 18) O records

David J. Mallinson and John S. Compton
Linking phosphogenic episodes on the Southeast U.S. margin to marine delta (super 13) C and delta (super 18) O records
Geology (Boulder) (February 1997) 25 (2): 103-106

Abstract

The relative abundance of phosphorite as a function of age was estimated for the southeastern United States using (super 87) Sr/ (super 86) Sr derived ages. The Sr-derived ages define seven phosphogenic episodes on the northeast Florida platform. Phosphorus burial rate estimates for the southeastern United States margin range from 2 to 12X10 (super 9) mol.P.yr (super -1) , and phosphorus accumulation rates range from 1 to 3 mu mol.cm (super -2) . yr (super -1) , similar to modern phosphogenic margins. The estimated amount of organic carbon burial ranges from 1 to 12X10 (super 16) mol C; sufficient to shift the ocean delta (super 13) C by 0.1% to 0.6%. On long time scales (>1 m.y.) phosphogenesis in the southeastern United States corresponds to increased organic carbon burial (positive delta (super 13) C shifts) and rising sea level (negative delta (super 18) O shifts). On shorter time scales (<1m.y.), the correlation of phosphogenesis to positive delta (super 13) C and delta (super 18) O shifts suggests a different relation between phosphogenesis, organic carbon burial, eustasy, and climate transitions during the Miocene.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 25
Serial Issue: 2
Title: Linking phosphogenic episodes on the Southeast U.S. margin to marine delta (super 13) C and delta (super 18) O records
Affiliation: University of South Florida, Department of Marine Science, St. Petersburg, FL, United States
Pages: 103-106
Published: 199702
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 1997-020210
Categories: Isotope geochemistrySedimentary petrologyOceanography
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
S26°06'42" - S26°06'42", E161°13'36" - E161°13'36"
N29°30'00" - N30°30'00", W81°30'00" - W80°00'00"
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: 199707
Program Name: DSDPDeep Sea Drilling Project
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