Linking phosphogenic episodes on the Southeast U.S. margin to marine δ13C and δ18O records

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doi: 10.1130/0091-7613(1997)025<0103:LPEOTS>2.3.CO;2
Author(s): Mallinson, David J.; Compton, John S.
Author Affiliation(s): Primary:
University of South Florida, Department of Marine Science, St. Petersburg, FL, United States
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 25(2), p.103-106. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. 37 refs.; illus., incl. 2 tables
Summary: The relative abundance of phosphorite as a function of age was estimated for the southeastern United States using 87Sr/86Sr 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 12×109 mol·P·yr-1, and phosphorus accumulation rates range from 1 to 3 µmol·cm-2· yr-1, similar to modern phosphogenic margins. The estimated amount of organic carbon burial ranges from 1 to 12×1016 mol C; sufficient to shift the ocean δ13C 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 δ13C shifts) and rising sea level (negative δ18O shifts). On shorter time scales (<1m.y.), the correlation of phosphogenesis to positive δ13C and δ18O shifts suggests a different relation between phosphogenesis, organic carbon burial, eustasy, and climate transitions during the Miocene.
Year of Publication: 1997
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 02 Geochemistry; 06 Petrology, Sedimentary; 07 Marine Geology and Oceanography; Absolute age; Atlantic Coastal Plain; Atlantic Ocean; Burial diagenesis; C-13/C-12; Carbon; Cenozoic; Chemically precipitated rocks; Continental margin sedimentation; Continental shelf; Cores; DSDP Site 588; Dates; Deep Sea Drilling Project; Diagenesis; Eastern U.S.; Florida; Francolite; Hawthorn Formation; IPOD; Isotope ratios; Isotopes; Leg 90; Lord Howe Rise; Marine environment; Marine sediments; Miocene; Neogene; North Atlantic; Northeastern Florida; Northwest Atlantic; O-18/O-16; Oxygen; Pacific Ocean; Phosphate rocks; Phosphates; Phosphorus; Sedimentary rocks; Sedimentation; Sedimentation rates; Sediments; Shelf environment; South Pacific; Southeastern U.S.; Southwest Pacific; Sr/Sr; Stable isotopes; Terrestrial environment; Tertiary; United States; West Pacific
Coordinates: S260642 S260642 E1611336 E1611336
N293000 N303000 W0800000 W0813000
Record ID: 1997020210
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