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IV.—Titaniferous Volcanic Rocks

Published online by Cambridge University Press:  01 May 2009

T. Crook
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Extract

In a paper read recently at a meeting of the Geological Society, Dr. Washington proposes to treat certain basalts of the Western Mediterranean basin as constituting “a hitherto unrecognised petro-graphic province, or comagmatic region, one of the most salient characters of which is the presence of salfemanes (basalts) that contain remarkably high amounts of titanium.”

Type
Original Articles
Information
Geological Magazine , Volume 4 , Issue 4 , April 1907 , pp. 157 - 165
Copyright
Copyright © Cambridge University Press 1907

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References

page 157 note 1 Washington, H. S. Dr., “The Titaniferous Basalts of the Western Mediterranean: a preliminary notice”: Quart. Journ. Geol. Soc., vol. lxiii (1907), No. 249.Google Scholar

page 159 note 1 Cordier appears to have thought that this was due to the extreme fineness of some of the particles, and the difficulty of freeing them from the matrix. It is not unlikely, however, that some of the grains which thus resisted attraction were ilmenite.

page 160 note 1 The possible occurrence of coarse intergrowths of ilmenite should always be kept in mind, and any residue which may be obtained should be examined magnetically, microscopically, and chemically, as rutile may also possibly be present.

page 161 note 1 “Chemical Analyses of Igneous Rocks”: Professional Paper, No. 14, U.S Geol Survey, 1903.

page 163 note 1 “The Quantitative Classification of Igmeous Rocks”: Science Progress, No. 2, 1906.

page 164 note 1 Allowing for the inclusions of such zircons, this would correspond to not more than 0.005 per cent, of Zr O2.

page 164 note 2 For the estimation of zirconia, Dr. Washington recommends the use of one gram of the crushed rock. See “Manual of the Chemical Analysis of Rocks,” 1904.