A 2.3 million year lacustrine record of orbital forcing from the Devonian of northern Scotland

S. D. Andrews, D. G. Cornwell, N. H. Trewin, A. J. Hartley, S. G. Archer

Research output: Contribution to journalArticle

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Abstract

Detailed sedimentological examination of onshore sections through cyclic lacustrine deposits of the Middle Devonian succession of northern Scotland has been augmented with offshore data to allow the construction of a continuous 2.3 myr record of orbital forcing. These data provide an important record of climatic variance through the Devonian, which, by comparison with other records from this time, can significantly improve our understanding of the Devonian global climatic system. Precessional and eccentricity cycles are shown to be dominant by the direct measurement and extrapolation of depositional rates in well-exposed sections as well as the analysis of ratios between primary and modulating cycles. Spectral analysis has confirmed the presence of regular cycles throughout the offshore data, which provide a far longer record of orbitally forced cyclicity than previously available. The presence of a half precession cycle is also suggested. Similar up-section variations in cycle thicknesses are recorded from both the onshore and offshore succession. These variations and those in cycle symmetry are related to a trend from an underfilled to a balanced-fill basin state. Of further importance in controlling cycle thickness is the period of each cycle during which lacustrine conditions, and therefore lake level controlled accommodation, existed.
Original languageEnglish
Pages (from-to)474-488
Number of pages15
JournalJournal of the Geological Society
Volume173
Issue number3
Early online date5 Feb 2016
DOIs
Publication statusPublished - May 2016

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orbital forcing
basin fill
cyclicity
precession
lake level
eccentricity
spectral analysis
symmetry
lacustrine deposit

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A 2.3 million year lacustrine record of orbital forcing from the Devonian of northern Scotland. / Andrews, S. D.; Cornwell, D. G.; Trewin, N. H.; Hartley, A. J.; Archer, S. G.

In: Journal of the Geological Society , Vol. 173, No. 3, 05.2016, p. 474-488.

Research output: Contribution to journalArticle

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