N-15/N-14 variations in Cretaceous Atlantic sedimentary sequences - Implication for past changes in marine nitrogen biogeochemistry

Details N-15/N-14 variations in Cretaceous Atlantic sedimentary sequences - Implication for past changes in marine nitrogen biogeochemistry N-15/N-14 variations in Cretaceous Atlantic sedimentary sequences - Implication for past changes in marine nitrogen biogeochemistry

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..82..269r&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 82, no. 3-4, April 1987, p. 269-279. USGS-supported research.

Physics

21

Atlantic Ocean, Biogeochemistry, Nitrogen Isotopes, Ocean Bottom, Sediments, Algae, Carbon, Depletion, Lithology, Nitrogen 15, Phytoplankton

Scientific paper

Unusually low delta N-15 found in early to middle Cretaceous beds rich in marine organic matter from two separate eastern Atlantic Ocean basins is reported. These findings constitute unambiguous evidence that the N contained in these strata is the end result of biogeochemical processes that differed substantially from those that operated on the N contained in intervening organic carbon-poor strata and younger marine sediments. The data indicate that the low N-15 relative abundance is the consequence of pelagic rather than postdepositional processes. Reduced ocean circulation, increased denitrification, and hence, reduced euphotic zone nitrate availability may have led to Cretaceous phytoplankton assemblages that were periodically dominated by N2-fixing blue-green algae, a possible source of the sedimentary N-15 depletion.

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