Mathematics – Logic
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.158..165s&link_type=abstract
Earth and Planetary Science Letters, vol. 158, Issue 3-4, pp.165-173
Mathematics
Logic
21
Anaerobic Environment, Cenomanian, Turonian, Black Shale, Paleo-Oceanography, Southern North Atlantic
Scientific paper
During mid-Cretaceous times large amounts of organic carbon (C org ) became sequestered in `black shales', possibly due to `oceanic anoxic events' characterized by the development of an extended oxygen minimum zone (OMZ). Here, we provide the first direct evidence for an open ocean OMZ in the Cenomanian/Turonian (C/T) southern North Atlantic and in fact show that the base of the photic zone was euxinic as revealed by molecular fossils from photosynthetic green sulfur bacteria in C/T black shales. This, together with evidence for bottom water anoxia and accumulation of redox-sensitive trace metals and hydrogen-rich organic matter, indicates a continuously euxinic water column. Concurrent with the high C org accumulation rates, which are 15-150 times greater in the southern than in the northern North Atlantic, and the low biological productivity, this suggests that preservation controlled the accumulation of C org in C/T black shales.
Köster Jörgen
Sinninghe Damst'e Jaap S.
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