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Detrital Andalusite in Tertiary and Post-tertiary sands1

Published online by Cambridge University Press:  14 March 2018

H. H. Thomas
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Extract

Until quite recently, in spite of its characteristic features, andalusite had not been met with in the younger detrital rocks of Britain ; a few years ago, however, I remarked on its relative abundance in the older Pliocene sands of St. Erth and St. Agnes in the west of Cornwall. Its presence in these deposits, in which it is associated with pink garnet and cyanite, is easily explained by the close proximity of the areas of deposition to the metamorphic aureoles of the west of England granitemasses, in which andalusite of identical character is exceedingly common. It also occurs in fair quantity in the Pliocene sands of Lenham in Kent accompanied by cyanite, and together with cyanite and garnet in the Red and Norwich Crags and the Chillesford Beds in the east of England.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 15 , Issue 70 , July 1909 , pp. 241 - 244
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1909

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Footnotes

1

Communicated by permission of the Director of H. M. Geological Survey.

References

Page 241 note 2 Thomas, H. H., Quart. Journ. Geol. Soc., 1902, vol. lviii, p. 620.CrossRefGoogle Scholar

Page 241 note 3 Ibid, 1900, vol. lvi, pp. 38-43.

Page 241 note 4 Hume, W. F. in ‘Cretaceous Rocks of Britain,’ vol. ii (Mem. Geol. Surv.), 1903, p. 510.Google Scholar

Page 241 note 5 Bréon, R., Bull. Soc. Min. France, 1880, vol. iii, p. 46.Google Scholar

Page 241 note 6 Artini, E., Giorn. Min. crist. Ital., 1891, vol. ii, pp. 1–19 Google Scholar, also p. 177 ; Riv. Min. crist. Ital, 1898, vol. xix, pp. 33-34.

Page 242 note 1 Bull. Imp. Inst., 1906, vol. iv, p. 301.

Page 243 note 1 The thickness of the grains was obtained by measuring the retardation on the cleavage-plane, assuming that for andalusite γ-α= 0.011, which gives the value 0.0086 for the birefringence on (110).

Page 244 note 1 These sands are described in ‘The Country around Carmarthen’, Mem. Geol. Surv. (in the press).