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On a series of volcanic rocks from the neighbourhood of the Lucalla River, Angola

Published online by Cambridge University Press:  14 March 2018

Arthur Holmes
Arthur Holmes*
Affiliation:
Imperial College of Science and Technology, London
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Extract

Last year, while working through the geographical collection of rocks in the Geological Department of the Imperial College, I found an interesting series of volcanic rocks from the neighbourhood of the Lucalla River in the district of Cambambe, Angola, which hitherto has not been described. The specimens were collected about the year 1860 by J. J. Monteiro, a former student of the Royal School of Mines, who devoted many years to the exploration of Angola. The collection, though consisting of only ten specimens z comprises porphyritic basalts, alkalitrachytes, a nephelinite allied to monchiquite, and an augite-andesite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 18 , Issue 83 , November 1916 , pp. 58 - 75
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1916

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References

page 58 note 1 Monteiro, J. J., 'Angola and the River Congo,' 1875, vol. ii, p. 69 Google Scholar, writes : 'A very interesting excursion was one I made [from Cambambe] about thirty miles in a northern direction, where I passed through most beautiful mountain scenery, the formation of the country being trachyte.' On pp. 65 and 70, he mentions the series of lavas lying between Senza do Itombe and Bango, and suggests that the two occurrences are connected.

See also Choffat, P., 'Coup d'oeil sur la géologle do la province d'Angola.' Comm. Dir. Trab. Geol. Portugal, 1895-6, vol. iii, pp. 84–91 Google Scholar.

page 60 note 1 Pereira da Sousa, C. R. Acad. Sci. Paris, 1913, vol. clvii, p. 1450.

page 60 note 2 Holmes, A., Geol. Mag., 1915, dec. 6, vol. ii, pp. 228–232, 322-328CrossRefGoogle Scholar, and 366-370. See also Berg, G., Min. Petr. Mitt., 1903, vol. xxii, p. 359 Google Scholar.

page 60 note 3 These are Probably the 'trap rocks' encountered by Livingstone almost at the commencement of his journey from Loanda to the Zambesi. 'Travels in South Africa,' 1857, p. 398.

page 60 note 4 P. Choffat, loc. cit., pp. 89 and 90. Gomes, J. P., Comm. Dir. Trab. Geol. Portugal, 1896-8, vol. iii, p. 289 Google Scholar.

page 60 note 5 J. J. Monteiro, loc. cit., p. 220.

page 62 note 1 Hatch, F. H., Trans. Roy. Soc. Edinburgh, 1892, vol. xxxvii, p. 119 Google Scholar. Tyrrell, G. W., Trans. Geol. Soc. Glasgow, 1912, vol. xiv, p. 241 Google Scholar.

page 62 note 2 Ibid., p. 245.

page 64 note 1 Prior, G.T., Mineralogical Magazine, 1900, vol. xli, p. 322 Google Scholar.

page 65 note 1 A. Lacroix, ' Lea Enclaves des roches volcaniques,' 1898, p. 531. For various explanations, see p. 641. et seq.

page 65 note 2 Stelzner, A. W., Jahrb. k.-k. Geol. Reiehsanst. Wien, 1885, vol. xxv, p. 277 Google Scholar.

page 65 note 3 Prior, G. T., Mineralogical Magazine, 1900, vol. xii, pp. 820–821 Google Scholar.

page 65 note 4 Derby, O. A., Amer. Journ. Sci., 1889, vol. xxxvii, p. 185 Google Scholar.

page 66 note 1 Holmes, A., Abstr. Proc. Geol. Soc., 1916, No. 994, p. 72.Google Scholar

page 66 note 2 Prior, G. T., Mineralogical Magazine, 1903, vol. xiii, p. 241.Google Scholar

page 71 note 1 See Washington, H. S., Journ. Geol., 1897, vol. v, p. 366.Google Scholar

page 71 note 2 Holmes, A., Abstr. Proc. Geol. Soc., 1916, No. 994, p. 72.Google Scholar

page 71 note 3 S. J. Shand, Geol. Mag., 1913, p. 508 ; 1914, p. 485 ; 1915, p. 339.

page 71 note 4 Tyrrell, G. W., Trans. Roy. Soc. Edinburgh, 1916, vol. li, p. 550.Google Scholar