N2-fixing cyanobacteria supplied nutrient N for Cretaceous oceanic anoxic events

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doi: 10.1130/G20458.1
Author(s): Kuypers, Marcel M. M.; van Breugel, Yvonne; Schouten, Stefan; Erba, Elisabetta; Sinninghe Damsté, Jaap S.
Author Affiliation(s): Primary:
Royal Netherlands Institute for Sea Research, Department of Marine Biogeochemistry and Toxicology, Den Burg, Netherlands
University of Milan, Italy
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 32(10), p.853-856. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. With GSA Data Repository Item 2004141. 24 refs.; illus., incl. sects.
Summary: The abundance of specific membrane lipids, 2-methylhopanoids, indicates that cyanobacteria played a key role in the seemingly global deposition of black shales during the early Aptian (ca. 120.5 Ma) and late Cenomanian (ca. 93.5 Ma) oceanic anoxic events. Organic matter-rich sediments deposited during these events are characterized by a 15N content typical of newly fixed N2, indicating that cyanobacterial N2 fixation was the main source for nutrient N. We propose that denitrification and anaerobic ammonium oxidation effectively cut off the return of nutrient N from the anoxic deep waters to the photic zone in the oceans, giving N2-fixing cyanobacteria a competitive advantage over algae during these oceanic anoxic events.
Year of Publication: 2004
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Anaerobic environment; Aptian; Aromatic hydrocarbons; Atlantic Ocean; Biochemistry; Biogenic processes; Black shale; Cenomanian; Clastic rocks; Cretaceous; Cyanobacteria; DSDP Site 144; DSDP Site 367; DSDP Site 463; DSDP Site 603; Deep Sea Drilling Project; Denitrification; Europe; Fixation; France; Geochemical cycle; Geochemistry; Hopanoids; Hydrocarbons; IPOD; Isotope ratios; Isotopes; Italy; Leg 14; Leg 41; Leg 62; Lower Cretaceous; Marine environment; Mesozoic; N-15/N-14; Nitrogen; North Atlantic; Nutrients; Organic compounds; Pacific Ocean; Paleo-oceanography; Sedimentary rocks; Southern Europe; Stable isotopes; Tethys; Triterpanes; Upper Cretaceous; Western Europe
Coordinates: N212101 N212101 E1744004 E1744004
N092714 N092714 W0542031 W0542031
N122913 N122913 W0200250 W0200250
N352939 N352940 W0700142 W0700143
Record ID: 2004082137
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States