Other
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..57..437o&link_type=abstract
Earth and Planetary Science Letters, Volume 57, Issue 2, p. 437-447.
Other
19
Scientific paper
Titanomagnetites of near-stoichiometric composition Fe2.4-δAlδO4 (δ = 0, 0.1 and 0.2) were oxidized in air to form compositions in the corresponding titanomaghemite system. The magnetic hysteresis properties-saturation magnetization, isothermal remanence, coercive force, initial susceptibility-were determined as a function of degree of oxidation, in some cases being measured at elevated temperatures. The titanomagnetites of the submarine crust are believed to become progressively maghemitized and the measured properties are related to the way in which the intensity and stability of an initially acquired thermoremanence will be modified during submarine weathering. The results from the present (monodomain) synthetic analogues suggest that the intensity of remanence would fall by up to 50% during weathering. This fall in intensity might be increased by a fraction of the grains becoming superparamagnetic although this was not so with the grain size range of the synthetics. The stability of remanence would at first be increased by maghemitization and subsequently fall. The rise in susceptibility with maghemitization would lead to an enhancement of the component of magnetization induced in an ambient field. Although the study probably simulates the compositions produced during submarine weathering, the changes in microstructure (e.g. due to grain cracking or heterogeneities in larger grains) which may occur in nature are probably not reproduced in the synthetic analogues.
O'Reilly W.
Özdemir O.
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