The densities of deep‐seated material of the Earth's Crust, as determined by chemical analysis, and the bearing of such densities on the theory of isostasy

Abstract

A résumé was given of the work which had been done by the author, showing that the densities of igneous rocks found at different places on the earth's surface, as computed from chemical analyses, bear a very definite relation to the elevation of the ground at which the rocks are found. The higher the elevation of the earth's surface the less is the density of the igneous rocks. This fact fits in well with the theory of isostasy which postulates that under each topographic feature there is a compensating deficiency or excess in density. The investigations in rock densities and isostasy will give information in regard to the earth's crust that apparently cannot be gained by other means.