Preliminary results on the use of magnetic techniques on the study of the granite aureoles.

Abstract

The thermal effect of the granite emplacement on the surrounding country rocks has been studied by the use of three magnetic techniques: magnetic susceptibility, isothermal remanent magnetization and Curie point. This effect would sometimes produce metasomatic reactions which yields new ferromagnetic components in the surrounding country rocks. The study indicates that the magnetic techniques are sensitive to these thermal alterations which change the magnetic mineralogy and can be used to determine the limits of the contact aureoles.