Sedimentological, organic petrographic and organic chemical characteristics of Albian and Cenomanian/Turonian black shales from the North Altlantic (Tab. 3, 4) ...

• Main Authors: Stein, Ruediger, Rullkötter, Jürgen, Welte, Dietrich Hugo
• Format: Dataset
• Language: English
• Published: PANGAEA 1989
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; DEPTH, sediment/rock; Sample code/label; Epoch; Lithology/composition/facies; Carbon, organic, total; Hydrogen index, mass HC, per unit mass total organic carbon; Maceral; Nonaromatic hydrocarbon fraction; Comment; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHN, LECO; Leg41; Leg76; Leg79; Leg93; Glomar Challenger; Deep Sea Drilling Project DSDP; Northwest Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.667191; https://doi.pangaea.de/10.1594/PANGAEA.667191

Large parts of the Cretaceous Atlantic Ocean are characterized by the wide-spread deposition of organic-carbon-rich sediments ("black shales“), with a maximum occurrence during Aptian/Albian and Cenomanian/Turonian times. In order to explain the origin of these black shales, changes in the amount and type of organic matter in relation to changes in paleogeography, paleoceanic circulation, and paleoclimate have been investigated in detail. The study is mainly based on calculation of accumulation rates of marine and terrigenous organic carbon, organic carbon/sedimentation rate relationships, and estimates of paleoproductivity. Because both the amount and type of organic matter in the black shales change markedly with location and age, different mechanisms must have caused the accumulation of these organic-carbon-rich sediments: (1) Terrigenous organic matter supply was the dominant factor for black shale formation during Hauterivian and Albian times in the Northwest Atlantic.(2) Increased oceanic productivity ... : Supplement to: Stein, Ruediger; Rullkötter, Jürgen; Welte, Dietrich Hugo (1989): Changes in paleoenvironments in the Atlantic Ocean during Cretaceous times: results from black shales studies. Geologische Rundschau, 78(3), 883-901 ...