Skip to Main Content
GEOREF RECORD

The White Stone Band of the Kimmeridge Clay Formation, an integrated high-resolution approach to understanding environmental change

S. J. Pearson, J. E. A. Marshall and A. E. S. Kemp
The White Stone Band of the Kimmeridge Clay Formation, an integrated high-resolution approach to understanding environmental change (in Organic-carbon burial, climate change and ocean chemistry (Mesozoic-Palaeogene), Helen S. Morgans-Bell (prefacer) and Anthony S. Cohen (prefacer))
Journal of the Geological Society of London (July 2004) 161 (4): 675-683

Abstract

The Kimmeridge Clay is a Jurassic mudrock succession that shows Milankovitch Band climatic cyclicity. A key issue is to determine how the subtle changes that define this cyclicity result from climatic change. Using material from the Natural Environment Research Council Rapid Global Geological Events (RGGE) Kimmeridge Drilling Project boreholes, the White Stone Band was investigated at the lamination scale using backscattered electron imagery and quantitative palynofacies. Fabric analysis shows the lamination to represent successive deposition of coccolith-rich and organic-matter-rich layers. Individual laminae contain unsorted palynological debris with a consistent ratio of marine and terrestrial components. Such mixed organic matter input is interpreted as the result of storm transport. Linking water column processes to laminae deposition suggests seasonal input with a coccolith bloom followed by a more diverse assemblage including dinoflagellates and photosynthetic chlorobiacean bacteria. As the photic zone extended into the euxinic water column organic matter export to the sea bed underwent minimal cycling through oxidation and subsequently became preserved through sulfurization with greatly increased sequestration of carbon. This was significantly increased by late season storm-driven mixing of euxinic water into the photic zone. Increased frequency of storm systems would therefore dilute the coccolith input to give an oil shale. Hence climatically induced changes in storm frequency would progressively vary the organic content of the sediment and generate the climate cycle signal.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 161
Serial Issue: 4
Title: The White Stone Band of the Kimmeridge Clay Formation, an integrated high-resolution approach to understanding environmental change
Title: Organic-carbon burial, climate change and ocean chemistry (Mesozoic-Palaeogene)
Author(s): Pearson, S. J.Marshall, J. E. A.Kemp, A. E. S.
Author(s): Morgans-Bell, Helen S.prefacer
Author(s): Cohen, Anthony S.prefacer
Affiliation: University of Southampton, Southampton Oceanography Center, Southampton, United Kingdom
Affiliation: University of Oxford, Dept. of Earth Sciences, Oxford, United Kingdom
Pages: 675-683
Published: 200407
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 26
Accession Number: 2004-061347
Categories: StratigraphySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 plate
N50°30'00" - N51°10'00", W03°00'00" - W01°45'00"
Secondary Affiliation: Open University, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200418
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal