Tyson, Richard V. (1984): Palynofacies investigation of Callovian (Middle Jurassic) sediments from DSDP Site 534, Blake-Bahama Basin, western central Atlantic. Butterworth [in conjunction with the] Geological Society, Surrey, United Kingdom, Marine and Petroleum Geology, 1 (1), 3-13, georefid:1984-046620
Abstract:
A new and previously unpenetrated lithological unit composed mainly of claystones was cored above basalt basement at Site 534 in the Blake-Bahama Basin. The Callovian part of the new unit contains interbedded "black shales" which were hitherto unexpected in this part of the section. The paper presents a brief palynological examination of lithofacies-kerogen relationships in these sediments and shows that their organic content is almost entirely a function of the redeposition of terrestial and marine organic matter versus the ambient redox conditions of the depositional environment. Allochthonous organic matter inputs are highest in the interbedded turbidites and decline progressively toward the pelagic black shales in which marine organic matter is comparatively well preserved. The significance of various kerogen and palynomorph indices are discussed. The study emphasizes the absolute necessity for sedimentologically-aware sampling in all palynological and geochemical work on lithologically heterogeneous sequences.--Modified journal abstract.
Coverage:
West: -76.0000 East: -74.0000 North: 29.0000 South: 28.0000
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