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II.—The Lamprophyres of the North of England

Published online by Cambridge University Press:  01 May 2009

Alfred Harker
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Extract

The north-country lamprophyres occur usually as dykes of no great magnitude, sometimes as sills, more rarely as small bosses or laccolites. They are scattered over an area extending from Teesdale to Furness, from Bassenthwaite to Ingleton. A circle thus defined has a diameter of about fifty miles, and embraces all the known occurrences, though others may exist beyond these limits concealed by post-Silurian strata. In the centre of the circle is the Shap granite, and the probable genetic connexion between the lamprophyres and this granitic intrusion has already been urged by Mr. Marr and the present writer.

Type
Original Articles
Information
Geological Magazine , Volume 9 , Issue 5 , May 1892 , pp. 199 - 206
Copyright
Copyright © Cambridge University Press 1892

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References

page 199 note 1 It may be remarked here that the lamprophyre of Sale Fell, near Bassenthwaite, which is of a somewhat acid variety, may possibly have had a quite distinct origin.

page 199 note 2 Bonney, (analyses by Houghton), Q.J.G.S., vol. xxxv. p. 160;Google Scholar Eutley,ibid.vol. xxxiv. p. 29, and Mem. Geol. Suvv. Ingleborough (97 S.W.); Tate, Proc. Torks. Geol. Pol. Soc. vol. ix. p. 372, vol. xi. p. 311, and Rep. Brit. Assoc. for 1890, p. 814; Hatch,ibid.p. 813, and Mem. Geol. Surv. Mallerstang (97 N. W.); Balderston, , “Naturalist,” 1889, p. 131;Google ScholarHarker, and Marr, , Q.J.G.S., vol. xlvii. p. 285;Google Scholar Harker, ibid. p. 521; see also Teall, “Brit. Petr.” chap. x.

page 200 note 1 Iddings, , Amer. Journ. Science, vol. xxxvii. p. 208 (1888).CrossRefGoogle Scholar

page 201 note 1 Tsch, . Min. Mitth..(2) xi. p. 27 (1890).Google Scholar

page 202 note 1 The name mica-trap evidently cannot be made to cover all the types here included.

page 202 note 2 Tsch, . Min. Mitth. (2) vol. xi. p. 445.Google Scholar

page 202 note 3 Rep. Geol. Surv. Ark. for 1890, vol. i.Google Scholar

page 203 note 1 Mitth, . Grossherz. Baden Landes, vol. ii. p. 258.Google Scholar

page 203 note 2 Brögger, , Syenitpegmatitgänge, p. 49.Google Scholar

page 204 note 1 Zeits, . deuts. geol. Ges. vol. xli. p. 163 (1889).Google Scholar