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II.—On Dedolomitization

Published online by Cambridge University Press:  01 May 2009

T. Crook
T. Crook
Affiliation:
Scientific and Technical Department, Imperial Institute.
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Extract

It is a noteworthy feature of the most ancient crystalline limestones that they are generally dolomitic, or at any rate frequently so. They often consist of practically pure dolomite; whilst associated with this in some cases is pure crystalline magnesite, which is very liable to be mistaken for saccharoidal dolomite.

Type
Original Articles
Information
Geological Magazine , Volume 8 , Issue 8 , August 1911 , pp. 339 - 345
Copyright
Copyright © Cambridge University Press 1911

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References

page 339 note 2 Such crystalline magnesite occurs in Ceylon, as at Randeniya, Wellawaya. It occurs also in various parts of North America (see Dana's, System of Mineralogy, 6th ed., p. 275Google Scholar) and elsewhere.

page 339 note 1 Woodward, , Geol. Mag., Dec. III, Vol. II, p. 352, Pl. IX, Figs. 7–s0, 1885Google Scholar; Reed, Ibid., Dec. V, Vol. IV, p. 113, Pl IV, Fig. 12, 1907.

page 339 note 2 Such crystalline magnesite occurs in Ceylon, as at Randeniya, Wellawaya. It occurs also in various parts of North America (see Dana's, System of Mineralogy, 6th ed., p. 275Google Scholar) and elsewhere.

page 340 note 1 It is convenient to use the name chondrodite in a general sense for the members of the humite series when dealing with scattered granules in these rocks, since it is not practicable to identify any given irregular small grain with safety as belonging to any particular member of the series.

page 340 note 2 See particularly The Geological Structure of the North-West Highlands (Memoirs of the Geological Survey of Great Britain), pp. 453–62, 1907.Google Scholar

page 340 note 3 Loc. cit.

page 340 note 4 The Tertiary Igneous Rocks of Skye (Mem. Geol. Surv.), pp. 144–51, 1904.Google Scholar

page 340 note 6 Q. J. G. S., vol. lxvi, p. 507, 1910.Google Scholar

page 341 note 1 This is a specimen of the Ceylon Mineral Survey collection at the Imperial Institute.

page 342 note 1 These peculiar intergrowths of dolomite in calcite appear to be identical with those described and figured by Coomaraswamy (“Crystalline Limestones of Ceylon”: Q. J. G. S., vol. lviii, p. 412, 1902Google Scholar).

page 343 note 1 Geology of the Haliburton and Bancroft Areas, Province of Ontario. Adams, F. D. & Barlow, A. E., Memoir No. 6, Department of Mines, Canada, p. 214, 1910.CrossRefGoogle Scholar

page 344 note 1 “Petrology of Chhindwára”: Rec. Geol. Surv. Ind., vol. xxxiii, pt. iii, 1906.Google Scholar