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IV.—Some Speculations on the Phenomena suggested by a Geological Study of Vesuvius and Monte Somma

Published online by Cambridge University Press:  01 May 2009

H. J. Johnston-Lavis
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Extract

Disregarding for convenience the internal volcanic forces of the earth, let us take for granted that we have an unlimited supply of fused silicates at a very high temperature; what will be the changes and effects produced in the escape of such matters upon the earth's surface ?.

That, at the great sources of volcanic material the igneous mass is in a completely fused state there can hardly exist any doubt. By this is meant that the magma is an intimate mixture of various chemical elements and compounds that have not yet assumed any other than the fluid state, or, in other words, that the molecules move freely amongst each other and have not arranged themselves in any definite crystalline form.

Type
Original Articles
Information
Geological Magazine , Volume 2 , Issue 7 , July 1885 , pp. 302 - 307
Copyright
Copyright © Cambridge University Press 1885

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References

page 302 note 1 By “solution” is meant a condition similar to the solution of CO2 in water.

page 304 note 1 Judd, Volcanoes, 1881, p. 211.

page 305 note 1 It will be seen that even were the earlier part of the mountain Pumiceous. it certainly was not trachytic with products whose silica percentage is beneath 55 per cent.—Judd, Volcanoes, 1881, p. 204.Google Scholar

page 306 note 1 Scrope seemed inclined to accept a somewhat similar idea.—Volcanoes, 1825, p. 145.Google Scholar