THE EFFECT OF HYDROSTATIC PRESSURE UP TO 1.45 GPA ON THE MORIN TRANSITION OF HEMATITE-BEARING ROCK: IMPLICATIONS FOR PLANETARY CRUSTAL MAGNETIZATION - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2015

THE EFFECT OF HYDROSTATIC PRESSURE UP TO 1.45 GPA ON THE MORIN TRANSITION OF HEMATITE-BEARING ROCK: IMPLICATIONS FOR PLANETARY CRUSTAL MAGNETIZATION

Résumé

We present new experimental data on the dependence of the Morin transition temperature (TM) on hydrostatic pressure up to 1.61 GPa, obtained on a well-characterized multidomain hematite-bearing sample from a banded iron formation. We used a nonmagnetic high-pressure cell for pressure application and a Superconducting Quantum Interference Device magnetometer to measure the isothermal remanent magnetization (IRM) under pressure on warming from 243 K to room temperature (T0). IRM imparted at T0 under pressure in 270 mT magnetic field (IRM270mT) is not recovered after a cooling-warming cycle. Memory effect under pressure was quantified as IRM recovery decrease of 10%/GPa. TM, determined on warming, reaches T0 under hydrostatic pressure 1.38–1.61 GPa. The pressure dependence of TM up to 1.61 GPa is positive and essentially linear with a slope dTM/dP = (25 ± 2) K/GPa. This estimate is more precise than previous ones and allows quantifying the effect of a pressure wave on the upper crust magnetization, with special emphasis on Mars.
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hal-01251216 , version 1 (29-12-2021)

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N. S. Bezaeva, François Demory, Pierre Rochette, Jérôme Gattacceca, T. Gabriel, et al.. THE EFFECT OF HYDROSTATIC PRESSURE UP TO 1.45 GPA ON THE MORIN TRANSITION OF HEMATITE-BEARING ROCK: IMPLICATIONS FOR PLANETARY CRUSTAL MAGNETIZATION. Geophysical Research Letters, 2015, 50, pp.10. ⟨10.1002/2015GL066306⟩. ⟨hal-01251216⟩
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