Organofacies reconstruction and lipid geochemistry of sediments from the Galicia margin ...

• Main Authors: Stein, Ruediger, Rullkötter, Jürgen, Littke, Ralf, Schaefer, Rainer G, Welte, Dietrich Hugo
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1988
• Subjects: Drilling/drill rig; Leg103; Joides Resolution; Ocean Drilling Program ODP; Schaefer; North Atlantic; Northeast Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.743885; https://doi.pangaea.de/10.1594/PANGAEA.743885

Samples of Lower to middle Cretaceous rocks from ODP Sites 638, 640, and 641, drilled on the Galicia continental margin in the northeast Atlantic, have been investigated by organic geochemical methods (i.e., organic carbon determination, Rock-Eval pyrolysis, kerogen microscopy, gas chromatography, and gas chromatography/mass spectrometry) to define the Organofacies types and the depositional environments of these sediments. The results of this study fit well into the general picture drawn for the depositional history of the organic matter in Cretaceous organic-carbon-rich sediments in the North Atlantic from previous DSDP investigations.During the Valanginian to Albian, terrigenous organic carbon dominated the organic matter deposited on the Galicia continental margin. Cyclic changes in total organic carbon content were probably controlled by climatic-triggered changes in the supply of terrigenous organic matter from the nearby continent. A drastic change in depositional environment must have occurred near ... : Supplement to: Stein, Ruediger; Rullkötter, Jürgen; Littke, Ralf; Schaefer, Rainer G; Welte, Dietrich Hugo (1988): Organofacies reconstruction and lipid geochemistry of sediments from the Galicia margin, Northeast Atlantic (ODP Leg 103). In: Boillot, G; Winterer, EL; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 103, 567-585 ...