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Age, origin and climatic signal of English Mesozoic clays based on K/Ar signatures

Jeans, C. V., Mitchell, J. G., Fisher, M. J., Wray, D. S. and Hall, Ian Robert ORCID: 2001. Age, origin and climatic signal of English Mesozoic clays based on K/Ar signatures. Clay Minerals 36 (4) , pp. 515-539. 10.1180/0009855013640006

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The K/Ar characteristics of 53 clay assemblages (Triassic–Cretaceous), representing the detrital, volcanogenic and arid-facies clay mineral associations, are interpreted in relation to their mineralogy, chronostratic age and geological origins. The K-bearing mineral components of the 1–2 μm, 0.2–1 μm and <0.2 μm fractions of each clay assemblage together display one of two characteristic patterns of K2O and 40Ar values (the K/Ar signature of the assemblage) on a 40Ar/K2O correlation diagram. Interpretation of the K/Ar signatures indicates that: (1) all of these clay assemblages are apparently unaffected by burial diagenetic illitization; (2) the Jurassic and Cretaceous detrital clay assemblages are derived from the reworking of weathered Caledonian metasediments (420–500 Ma) and weathered kaolin-bearing sediments of Upper Devonian/Carboniferous age; and (3) the role played by palaeoclimate in developing the pattern of clay minerals in the Mesozoic sediments of England is much less significant than previously believed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Uncontrolled Keywords: K/Ar signature; climatic signal; clays; England; Triassic; Jurassic; Cretaceous
Publisher: Mineralogical Society
ISSN: 0009-8558
Last Modified: 20 Oct 2022 09:04

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