Russian Journal of Earth Sciences
Vol. 5, No. 4, August 2003
Properties of the chemical remanent magnetization formed at a single-phase
oxidation
and a subsequent decomposition of titanomagnetites
A. K. Gapeev and S. K. Gribov
Abstract
Regularities of influence of a single-phase (SP) oxidation and a subsequent
decomposition of synthetic titanomagnetites (TM) of a different original composition
(Fe3-xTixO4 (where
x = 0.2, 0.4 and 0.6)) upon the change of their hysteresis
parameters and on properties of
the resultant chemical remanent magnetization (CRM) were determined as a result of
the
laboratory researches. Calculations were made of the changes of magnetization of
the igneous
rocks similar to the investigated TM of a composition with
x = 0.4 taking into account SP changes
of the primary titanomagnetite at a high partial pressure of oxygen. The influence
of CRM on
safety of the primary (thermoremanent) magnetization at different stages of the SP
oxidation of
TM and decomposition of the cation-deficient TM was assessed. The results which were
obtained may be used for interpretation of changes in the magnetic properties of
the submicron
grains of TM in the course of their thermal transformation on the earth surface.