Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102121
Title: Thermoremanence acquisition and demagnetization for titanomagnetite under lithospheric pressures
Authors: Launay, N.
Rochette, P.
Quesnel, Y.
Demory, F.
Bezaeva, N. S.
Lattard, D.
Issue Date: 2017
Publisher: Blackwell Publishing Ltd
Citation: Thermoremanence acquisition and demagnetization for titanomagnetite under lithospheric pressures / N. Launay, P. Rochette, Y. Quesnel, et al. — DOI 10.1002/2017GL073279 // Geophysical Research Letters. — 2017. — Vol. 44. — Iss. 10. — P. 4839-4845.
Abstract: The geological sources of large-scale lithospheric magnetic field anomalies are poorly constrained. Understanding the magnetic behavior of rocks and minerals under the pressures and temperatures encountered at large crustal depths is particularly important in that task. The impact of lithospheric pressure is not well known and most of the time neglected in numerical models of the geological sources of magnetic anomalies. We present thermal remanent magnetization (TRM) acquisition and stepwise thermal demagnetization on synthetic titanomagnetite dispersed powder, within an amagnetic cell under hydrostatic pressure up to 1 GPa. TRM is measured after thermal cycling within a cryogenic magnetometer. Pressure-dependent increase in the Curie temperature (initially in the 50–70°C range) is observed, mostly between 0.3 and 0.6 GPa, on the order of 20 K/GPa. TRM intensity also increases with pressure up to 200% at 675 MPa, although the pressure variation with temperature inside the cell complicates the interpretation. ©2017. American Geophysical Union. All Rights Reserved.
Keywords: LITHOSPHERE
MAGNETIC ANOMALIES
PRESSURE
TITANOMAGNETITE
TRM
GEOLOGY
HYDROSTATIC PRESSURE
MAGNETISM
PRESSURE
LITHOSPHERE
LITHOSPHERIC MAGNETIC FIELD
MAGNETIC ANOMALIES
PRESSURE DEPENDENT
PRESSURE VARIATIONS
STEPWISE THERMAL DEMAGNETIZATION
THERMAL REMANENT MAGNETIZATION
TITANOMAGNETITES
DEMAGNETIZATION
DATA ACQUISITION
DEMAGNETIZATION
HYDROSTATIC PRESSURE
LITHOSPHERE
MAGNETIC ANOMALY
MAGNETIC FIELD
MAGNETOMETER
MINERAL PROPERTY
NUMERICAL MODEL
PRESSURE GRADIENT
ROCK PROPERTY
TEMPERATURE
THERMOREMANENT MAGNETIZATION
TITANOMAGNETITE
URI: http://hdl.handle.net/10995/102121
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85019675129
PURE ID: 1925439
ISSN: 948276
DOI: 10.1002/2017GL073279
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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