Organic carbon and total sulfur content and concentrations of selected molecular fossils for C/T black shales (Table 1) ...

During mid-Cretaceous times large amounts of organic carbon (Corg) 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...

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Bibliographic Details
Main Authors: Sinninghe Damsté, Jaap S, Köster, Jürgen
Format: Dataset
Language:English
Published: PANGAEA 1998
Subjects:
Event label
Latitude of event
Longitude of event
Elevation of event
DEPTH, sediment/rock
Sample code/label
Area/locality
Paleoelevation
Carbon, organic, total
Sulfur, total
Concentration of molecular fossils
Hopane isomerization
Drilling/drill rig
DSDP/ODP/IODP sample designation
Element analyser CS, LECO
Gas chromatography - Mass spectrometry GC-MS
Leg11
Leg14
Leg41
Leg51
Leg80
Leg93
Leg103
Glomar Challenger
Joides Resolution
Deep Sea Drilling Project DSDP
Ocean Drilling Program ODP
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.721057
https://doi.pangaea.de/10.1594/PANGAEA.721057
Description
Summary:During mid-Cretaceous times large amounts of organic carbon (Corg) 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 Corg 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 Corg in C/T black shales. ... : Supplement to: Sinninghe Damsté, Jaap S; Köster, Jürgen (1998): A euxinic southern North Atlantic Ocean during the Cenomanian/Turonian oceanic anoxic event. Earth and Planetary Science Letters, 158(3-4), 165-173 ...

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