Changes in organic carbon stable isotope ratios across the K/T boundary; global or local control?

Author(s): Meyers, Philip A.
Author Affiliation(s): Primary:
University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States
University of Oklahoma, United States
Volume Title: Isotope fractionations in organic matter; biosynthetic and diagenetic processes
Volume Author(s): Macko, Stephen A., editor; Engel, Michael H.
Source: Chemical Geology, 101(3-4), p.283-291; Geological Society of America, annual meeting, symposium on Isotope fractionations in organic matter; biosynthetic and diagenetic processes, Dallas, TX, Nov. 1, 1990, edited by Stephen A. Macko and Michael H. Engel. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541 CODEN: CHGEAD
Note: In English. 40 refs.; 1 table
Summary: A global shift in carbonate carbon delta13C-values from heavier values in the Maastrichtian to lighter values in the early Danian indicates recycling of isotopically light organic C reservoirs during a period of depressed marine productivity. Comparison oforganic C delta13C-values from globally dispersed Cretaceous/Tertiary (K/T) sections does not show a similar, well-developed pattern. Several factors evidently overwhelm the potential impact of an isotopically lighter inorganic C source on organic matter isotope signatures: 1) species changes in biological assemblages may modify the averaged isotopic fractionation of organic matter, and 2) shifts in the proportion of land/marine organic matter contributions to coastal marine locations may overprint the isotopic record. Local phenomena evidently outweigh global change in determining the isotope signature of organic C deposited in the K/T boundary sections.
Year of Publication: 1992
Research Program: DSDP Deep Sea Drilling Project
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; C-13/C-12; California; Carbon; Cenozoic; Chemostratigraphy; Cretaceous; Danian; Deep Sea Drilling Project; Experimental studies; Isotopes; K-T boundary; Lower Paleocene; Lower Tertiary; Maestrichtian; Mesozoic; Organic carbon; Organic compounds; Organic materials; Paleocene; Paleogene; Ratios; Senonian; Stable isotopes; Stratigraphic boundary; Stratigraphy; Tertiary; Texas; United States; Upper Cretaceous
Record ID: 1992065642
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom

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