Magnetism of the earth crust

Abstract

In Part 1 the present writer proposes a method by which the pressure and temperature conditions under which rocks have been formed can be clarified from mesurements of magnetic state of rock-forming minerals. The method is established by being based upon observations of piezo-thermal equilibria of titaniferous ferrites and silicates which are prevailing in the lithosphere. In Part 2 is described the details of the method mentioned above. In Parts 3 and 4 are discussed the following subjects : 1) Zone of titaniferous ferrite in the crust, 2) Separation of the crust into three magnetically different layers ; namely the uppermost layer of ferromagnetism due to ferrite, the middle layer of paramagnetism due to titaniferous ferrites and the lowest layer of paramagnetism without titaniferous ferrites, 3) Region of thermo-remanent magnetism, 4) Composition and Curie point of ferrite as the indicator of the depth at which plutonic rocks were formed initially. © 1957, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.