Remanent magnetization and coercivity of rocks under hydrostatic pressure up to 1.4 GPa
Article first published online: 6 AUG 2013
©2013. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 40, Issue 15, pages 3858–3862, 16 August 2013
How to Cite
2013), Remanent magnetization and coercivity of rocks under hydrostatic pressure up to 1.4 GPa, Geophys. Res. Lett., 40, 3858–3862, doi:10.1002/grl.50763., , , , and (
- Issue published online: 28 AUG 2013
- Article first published online: 6 AUG 2013
- Accepted manuscript online: 19 JUL 2013 05:40AM EST
- Manuscript Accepted: 14 JUL 2013
- Manuscript Revised: 9 JUL 2013
- Manuscript Received: 14 MAY 2013
 We designed an Isothermal Remanent Magnetization (IRM) acquisition system based on permanent magnets and sized to accommodate an amagnetic hydrostatic pressure cell. This pressure cell fits in a superconducting rock magnetometer, allowing for the measurement of remanent magnetization of pressurized samples. With this system, we determined the coercivity of remanence (Bcr) at different hydrostatic pressures up to 1.4 GPa for rock and dispersed mineral samples with various magnetic mineralogy and domain state. IRM and Bcr are nearly identical before compression and after decompression, indicating no permanent changes in the magnetic properties during pressure cycling. Hydrostatic pressure up to 1.4 GPa does not significantly increases IRM under pressure except for multidomain pyrrhotite and magnetite which show an increase of about 40%. Relative increase of Bcr under pressure is mild, except for a near single domain titanomagnetite where Bcr doubles.