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Title: Biostratigraphy and paleo-environmental reconstruction of the Triassic of the Central North Sea
Author: Burgess, Roger
ISNI:       0000 0004 7972 5417
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2019
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The current understanding of the Triassic successions of the Central North Sea (CNS) has been limited by a lack of knowledge regarding stratigraphy at a basinal, sub-basinal and field scale. These continental successions, comprising the Early Triassic Smith Bank and Mid-Late Triassic Skagerrak formations, represents alternations of sandstone and mudstone dominated packages/members. This alternation is thought to be climatically driven. Previous palynological analysis of Triassic sediments within the CNS however, has been limited by poor recovery due to a combination of the use of PDC drill bits and oil based muds, poor palynomorph preservation, and the heavily oxidised nature of Triassic sediments. Through the use of a refined palynology processing method it has been possible to obtain an updated palynomorph data set from which a robust biostratigraphic zonation scheme consisting of 8 bio-zones has been established. This has provided a chronostratigraphic framework that can be used to correlate across the CNS providing both clarity and age constraint on previously disputed stratigraphic units. The use of multivariate statistical techniques, such as de-trended correspondence analysis (DCA), have also been applied to this data set to quantitatively reconstruct paleo-environments. Using DCA it has been possible to construct a relative wet/dry trend for the CNS basin during the Triassic. The resultant trend reveal that the relationship between climate and individual members is not as simple as first indicated by existing models, and mudstone/sandstone cyclicity is not controlled solely by climate as previously thought but is more likely influenced by several factors working independently of each other. The climate trends shown here also suggest that the Carnian pluvial episode (CPE) documented from the South Permian basin and Tethys is not expressed in the CNS. Though the use of a Portable X-ray fluorescence (PXRF) scanner, the elemental signal through the Triassic succession of three wells from the UKCS CNS is also documented.
Supervisor: Jolley, David W. ; Hartley, Adrian J. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Palynology ; Geology, Stratigraphic