The clay mineralogy of some tills in the Cambridge district

Perrin, René

doi:10.1017/s0412752800020478

Cited by 24 publications

(6 citation statements)

References 13 publications

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“…The clays were Wyoming bentonite and Blisworth clay from Thrapston, Northants. The former is a relatively pure source of montmorillonite ; the Blisworth illite was predominantly micaceous, with a little uartz and kaolinite, and a trace of vermiculite.1 A similar clay was jescribed by Perrin (1957). Free carbonate was removed from Blisworth clay by treatment with dilute acid, and most of the soluble salts were removed by decantation before dispersion.…”

Section: Methodsmentioning

confidence: 99%

Cation Exchange Reactions

Salmon

1964

Journal of Soil Science

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Wyoming bentonite, Blisworth illite, and a fen peat were saturated with different proportions of calcium, magnesium, and potassium, and exchange between these cations was studied by measuring their activity ratios in dilute equilibrium solutions. With both clays the activity ratio UMg/UCa in solution was linearly related to the ratio of adsorbed Mg/Ca, the former being 1-22 times larger than the latter ratio. Peat held magnesium much less strongly than calcium, and the difference increased with increasing magnesium saturation. With all three materials the activity ratio UMg/UCa+Mg in solution was curdinearly related to the percentage magnesium saturation. Peat adsorbed potassium less strongly relative to the divalent cations than did the clays, and bentonite adsorbed potassium less strongly than illite. Decreasing the Ca:Mg ratio increased the strength with which peat adsorbed potassium, but had no effect on potassium adsorption by the clays. Exchange between magnesium and calcium in forty British soils was studied by measuring the concentration ratio [Mg]/[Ca+Mg] in equilibrium soil solutions. The relation between [Mg]/[Ca+Mg] in solution and the ratio of exchangeable Mg/(Ca+Mg) in different soils varied within the range covered by peat and bentonite or illite, suggesting that differences between soils might be due to different organic-matter contents. The extent to which [Mg]/[Ca + Mg]in solution was altered by changes in the exchangeable magnesium content differed considerably between soils. These differences were not all explained by variations in exchange capacity, showing that different soils adsorb magnesium with differing strengths relative to calcium.

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Section: Methodsmentioning

confidence: 99%

Cation Exchange Reactions

Salmon

1964

Journal of Soil Science

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“…In the higher stages of the English Chalk the clay minerals are chiefly illite and montmorillonite in approximately equal proportions, accompanied by lesser quantities of clay-grade quartz (Young, in Gray, 1965;Perrin, 1957;1971). Senonian stages in Sussex contain barytes, alkali-feldspar, low-temperature tridymite, euhedral quartz and apatite (Weir & Catt, 1965).…”

Section: Properties Of the Chalkmentioning

confidence: 99%

The magnetostratigraphy of Coniacian-Late Campanian chalk sequences in southern England

Montgomery¹,

Hailwood²,

Gale

et al. 1998

Earth and Planetary Science Letters

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“…There is a considerable literature on the clay mineralogy of the divisions of the Chalk. The general conclusions are that the Lower Chalk is very variable, with the rocks underlying East Anglia and the northern Weald (east of Farnham) containing a clay assemblage dominated by mica, kaolin, chlorite, vermiculite and mica-smectite (Perrin, 1956(Perrin, , 1964Jeans, 1968), whilst the rocks to the west of Farnham, the southern Weald and to the north of the Wash contain mica and mica-smectite in much greater proportions (Jeans, 1968). The latter assemblage is very similar to that found in the Upper and Middle Chalk (Khan, 1957;Weir & Catt, 1965;Young, 1965;Morgan-Jones, 1977;Pitman, 1978).…”

Section: Soils Derived From Carbonate Sedimentsmentioning

confidence: 99%

The soil clays of Great Britain: I. England and Wales

Loveland

1984

Clay miner.

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A B S T R A C T :The mineralogy of the clay fractions (<2 ~tm) of the major soils of England and Wales is reviewed, and the data presented in terms of the 1:250 000 National Soil Map. Most soils developed in pre-Rhaetic sediments are dominated by mica with lesser amounts of chlorite and kaolin. Exceptions are soils developed in calcareous Coal Measure shales which have significant smectite contents, and freely drained soils in Keuper Marl which contain swelling chlorite, sepiolite and palygorskite. Soils developed in post-Triassic sediments are dominated generally by expansible minerals, except for those developed in Lower Lias and Estuarine Series rocks (Jurassic) which are dominated by mica and kaolin respectively. The presence of loess in soils seems to be associated with the occurrence of a complex interstratified mineral with X-ray diffraction properties akin to vermiculite. Weathering of soil clays is most marked in the wetter uplands, but over most of lowland England is detectable only by slight changes in non-exchangeable potassium content and cation exchange capacity towards the soil surface. Applications of soil clay mineralogy in the fields of plant nutrition and soil mechanics are discussed, in particular the production of maps showing mineralogical provinces.

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The clay mineralogy of some tills in the Cambridge district

Cited by 24 publications

References 13 publications

Cation Exchange Reactions

Cation Exchange Reactions

The magnetostratigraphy of Coniacian-Late Campanian chalk sequences in southern England

The soil clays of Great Britain: I. England and Wales

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