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Chemistry and mineralogy of some Lower and Middle Chalks from Givendale, East Yorkshire

Published online by Cambridge University Press:  09 July 2018

J. I. Pitman
J. I. Pitman*
Affiliation:
School of Environmental Sciences, University of East Anglia, Norwich
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Abstract

The chemical composition of nine samples of Lower and Middle Chalk from the Givendale area of Yorkshire was determined; acetic acid residues were mechanically, chemically and mineralogically analysed. All nine chalk samples proved to be exceptionally pure calcium carbonate (96±1·5%), with only small amounts of MgO (1·03±0·53%), Al2O2 (0·33±0·28%) and Fe2O2 (0·20±0·14%). Insoluble residues ranged from 1·07 to 4·46%. Clay formed 56–88% of the insoluble residue. The non-clay fraction consisted of flint, quartz, collophane, limonite, feldspar, tourmaline and zircon. The clay fractions were dominated by montmorillonite (50%) with secondary illite (30%), apatite (3%), and quartz (8–30%). Kaolinite was detected by X-ray diffraction in the Lower Chalk.

Résumé

Résumé

La composition chimique de neuf échantillons de calcaire des crétacés inférieur et moyen de la région de Givendale dans le Yorkshire a été déterminée et des résidus d'acide acétique ont été analysés mécaniquement, chimiquement et minéralogiquement. On a constaté que les neuf échantillons de calciare étaint tous du carbonate de calcium d'une pureté exceptionnelle (96 ± 1·5%), avec seulement de petites quantités de MgO (1·03 ± 0·53 %), Al2O3 (0·33 ± 0·28%) et Fe2O3 (0·20 ± 0·14%). Les résidus insolubles allaient de 1·07 à 4·46%. L'argile formait 56–88% des résidus insolubles. La fraction non argileuse consistait en silex, quartz, collophane, limonite, feldspath, tourmaline et zircon. Les fractions argileuses étaient dominées par de la montmorillonite (50%) avec de l'illite secondaire (30%), de l'apatite (3%) et du quartz (8–30%). De la kaolinite a été détectée par diffraction des rayons X dans le crétacé inférieur.

Kurzreferat

Kurzreferat

Es wurde die chemische Zusammensetzung von neun Proben aus dem Lower und Middle Chalk des Givendale Gebietes von Yorkshire bestimmt. Die Rückstände aus dem Essigsäureaufschluss wurden mechanisch, chemisch und mineralogisch analysiert. Alle neun Kalkproben erwiesen sich als äusserst reines Kalziumkarbonat (96 ± 1·5%), mit nur geringen Anteilen an MgO (1·03 ± 0·53%), Al2O3 (0·33 ± 0·24%) und Fe2O3 (0·20 ± 0·14%). Der Anteil der unlöslichen Rückstande lag zwischen 1·07 und 4·46%. Der Tonanteil bildete 56 bis 88% des unlöslichen Rückstandes. Die Nicht-Tonfraktion bestand aus Flint, Quarz, Kollophan, Limonit, Feldspat, Turmalin und Zirkon. Die Tonfraktionen enthielten überwiegend Montmorillonit (50%) und Quarz (8–30%).

Kaolinit wurde röntgenographisch in dem Lower Chalk nachgewiesen.

Resumen

Resumen

Se ha determinado la composición química de nueve muestras de creta de las formaciones inferior y media de la zona de Givendale del condado de Yorkshire; se han analizado mecánica, química y mineralógicamente los residuos de ácido acético. Las nueve muestras resultaron ser carbonato cálcico excepcionalmente puro (96 ± 1·5%), con sólo pequeñas cantidades de MgO (1·03 ± 0·53%), Al2O3 (0·33 ± 0·28%) y Fe2O3 (0·20 ± 0·14%). Los residuos insolubles variaban desde 1·07 hasta 4·46%. La fracción no arcillosa consistía en pedernal, cuarzo, colófana, limonita, feldespato, turmalina y circón. Las fracciones de arcilla estaban dominadas por montmorillonita (50%) con ilita secundaria (30%), apatita (3%) y cuarzo (8–30%). Se detectó caolinita por difracción de rayos X en la creta inferior.

Type
Research Article
Information
Clay Minerals , Volume 13 , Issue 1 , March 1978 , pp. 93 - 100
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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