The formation and diagenesis of chalk (2024)

The Hydrogeology of the Chalk of North-West Europe

R A Downing (ed.) et al.

Published:

1993

Online ISBN:

9781383027266

Print ISBN:

9780198542858

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The Hydrogeology of the Chalk of North-West Europe

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J M Hanco*ck

J M Hanco*ck

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Pages

14–34

  • Published:

    November 1993

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Hanco*ck, J M, 'The formation and diagenesis of chalk', in R A Downing, M Price, and G P Jones (eds), The Hydrogeology of the Chalk of North-West Europe (Oxford, 1993; online edn, Oxford Academic, 31 Oct. 2023), https://doi.org/10.1093/oso/9780198542858.003.0002, accessed 19 Apr. 2024.

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Abstract

In old English usage of the word ‘chalk’, one of its distinctive features was its softness. Some authors have tried to maintain an indication of the degree of hardness in the definition. Geologists working for the Deep Sea Drilling Project regard chalks as ‘partly indurated oozes; they are friable limestones that are readily deformed under the fingernail or the edge of a spatula blade’ (Winterer et al. 1973, pp. 9–10; Garrison 1981). If the sediment is harder than this, these geologists call it ‘limestone’. This nomenclature allows for no distinction between lithified chalks and. other limestones, which actually have very different textures, and hence markedly different porosities and permeabilities. The distinction between a hard chalk and ordinary hard limestone was already recognized by Whitehurst (1786).

Keywords: Indication, Chalks, Textures, Distinction Distinction

Subject

Stratigraphy Oceanography and Hydrology Economic Geology

Collection: Oxford Scholarship Online

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