title: Determination of hafnium by neutron activation, and variation in the Zr/Hf ratio of some granite masses.
abstract: A fairly quick method for the separation of hafnium from irradiated rock samples is described and results of the hafnium determinations are reported. The distribution of zirconium and hafnium and the variation of the Zr/Hf ratio in three calc-alkali granite masses are discussed. Reasons are suggested for the observed decrease in the Zr/Hf ratio during the crystallization of igneous rocks.
authors.affiliation: Department of Geology, The University, Manchester, 13, U.K.
authors.forename: J
authors.initials: J
authors.lastname: Esson
authors.forename: P
authors.initials: P
authors.lastname: Hahn-Weinheimer
authors.forename: H
authors.initials: H
authors.lastname: Johanning