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Chemostratigraphy and provenance of clays and other non-carbonate minerals in chalks of Campanian age (Upper Cretaceous) from Sussex, southern England

Chemostratigraphy and provenance of clays and other non-carbonate minerals in chalks of Campanian age (Upper Cretaceous) from Sussex, southern England

Wray, D. S. and Jeans, C. V. (2014) Chemostratigraphy and provenance of clays and other non-carbonate minerals in chalks of Campanian age (Upper Cretaceous) from Sussex, southern England. Clay Minerals, 49 (2). pp. 327-340. ISSN 0009-8558 (Print), 1471-8030 (Online) (doi:10.1180/claymin.2014.049.2.10)

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Abstract

Geochemical analysis of acid-insoluble residues derived from white chalks and marl seams of Campanian age from Sussex, UK, has been undertaken. All display a broadly similar <2 μm mineralogical composition consisting of smectite or smectite-rich illite-smectite with subordinate illite and minor amounts of talc. Plots of K2O/Al2O3 and TiO2/Al2O3 indicate that most marl seams have an acid-insoluble residue composition which is slightly different to that of the over- and underlying white chalk, implying that marl seams are primary sedimentary features not formed through white chalk dissolution. On the basis of a negative Eu anomaly and trace element geochemistry one marl seam, the Old Nore Marl, is considered to be volcanically derived and best classified as a bentonite; it is considered to correlate with the bentonite M1 of the north German succession.

Item Type: Article
Additional Information: [1] Received 3 December 2013; revised 11 February 2014. [2] Published in Special issue of Clay Minerals - selected papers from the 7th Cambridge Diagenesis Conference 2011, with theme "Clay and carbonate facies and their diagenetic pathways in reservoir rocks."
Uncontrolled Keywords: Bentonite, Campanian, chemostratigraphy, cretaceous, mineralogy, sediment provenance, Sussex
Subjects: Q Science > QD Chemistry
Q Science > QE Geology
Faculty / Department / Research Group: Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Related URLs:
Last Modified: 11 Apr 2017 08:49
URI: http://gala.gre.ac.uk/id/eprint/11604

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