The effect of hydrostatic pressure up to 1.61 GPa on the Morin transition of hematite‐bearing rocks: Implications for planetary crustal magnetization

Bezaeva, N. S.; Demory, François; Rochette, P.; Садыков, Р. А.; Gattacceca, J.; Gabriel, Thomas; Quesnel, Yoann

doi:10.1002/2015gl066306

Cited by 6 publications

(15 citation statements)

References 44 publications

(113 reference statements)

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“…This behavior contrasts with that of the Verwey transition temperature in magnetite, which decreases with increasing hydrostatic pressure at about −3 K/GPa (Coe et al, 2012). Bezaeva et al (2015) found that T M changes with pressure at 25 K/GPa. T M thus reaches room temperature at 1.38-1.61 GPa (Figure 28c).…”

Section: Pressure Demagnetization Behavior Of Hematitementioning

confidence: 77%

The Magnetic and Color Reflectance Properties of Hematite: From Earth to Mars

Jiang

Liu

Roberts

et al. 2022

Reviews of Geophysics

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Hematite is a canted antiferromagnet with reddish color that occurs widely on Earth and Mars. Identification and quantification of hematite is conveniently achieved through its magnetic and color properties. Hematite characteristics and content are indispensable ingredients in studies of the iron cycle, paleoenvironmental evolution, paleogeographic reconstructions, and comparative planetology (e.g., Mars). However, the existing magnetic and color reflectance property framework for hematite is based largely on stoichiometric hematite and tends to neglect the effects of cation substitution, which occurs widely in natural hematite and influences the physical properties of hematite. Thus, magnetic parameters for stoichiometric hematite are insufficient for complete analysis of many natural hematite occurrences and can lead to ambiguous geological interpretations. Remagnetization, which occurs pervasively in red beds, is another ticklish problem involving hematite. Understanding red bed remagnetization requires investigation of hematite's formation and remanence recording mechanisms. We elaborate on the influence of cation substitution on the magnetic and color spectral properties of hematite, and on identifying hematite and quantifying its content in soils and sediments. Studies of remagnetization mechanisms are discussed, and we summarize methods to discriminate between primary and secondary remanences carried by hematite in natural samples to aid primary remanence extraction in partially remagnetized red beds. Although there remain unknown properties and unresolved issues that require future work, recognition of the properties of cation‐substituted hematite and remagnetization mechanisms for hematite will aid identification and interpretation of the magnetic signals that it carries, which is environmentally important and responsible for magnetic signals on Earth and Mars.

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Section: Pressure Demagnetization Behavior Of Hematitementioning

confidence: 77%

The Magnetic and Color Reflectance Properties of Hematite: From Earth to Mars

Jiang

Liu

Roberts

et al. 2022

Reviews of Geophysics

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“…Strain may cause reorientation and/or internal deformation of ferrimagnetic grains (e.g., Borradaile, 1988;Till & Moskowitz, 2014). This would lead to changes in a variety of magnetic properties, the most important of which are magnetic anisotropy, changes in remanence orientation and intensity, and changes in bulk magnetic properties such as coercivity and magnetic susceptibility (e.g., Bezaeva et al, 2015;Borradaile, 1996;Gattacceca et al, 2007;Gilder et al, 2004Gilder et al, , 2006Jackson et al, 1993;Jiang et al, 2013;Kapička, 1988Kapička, , 1992Kapička et al, 2006;Kean et al, 1976;Louzada et al, 2010). For example, up to 25% shortening due to axial compression in a set of synthetic magnetite-bearing "calcite sandstone" samples irreversibly increases their coercivity and magnetic anisotropy but decreases their mean magnetic susceptibility and the remanence component parallel to the shortening axis (Jackson et al, 1993).…”

Section: Strain-induced Magnetic Changesmentioning

confidence: 99%

Faulting Processes Unveiled by Magnetic Properties of Fault Rocks

Yang

Chou

Ferré

et al. 2020

Reviews of Geophysics

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As iron-bearing minerals-ferrimagnetic minerals in particular-are sensitive to stress, temperature, and presence of fluids in fault zones, their magnetic properties provide valuable insights into physical and chemical processes affecting fault rocks. Here, we review the advances made in magnetic studies of fault rocks in the past three decades. We provide a synthesis of the mechanisms that account for the magnetic changes in fault rocks and insights gained from magnetic research. We also integrate nonmagnetic approaches in the evaluation of the magnetic properties of fault rocks. Magnetic analysis unveils microscopic processes operating in the fault zones such as frictional heating, energy dissipation, and fluid percolation that are otherwise difficult to constrain. This makes magnetic properties suited as a "strain indicator," a "geothermometer," and a "fluid tracer" in fault zones. However, a full understanding of faulting-induced magnetic changes has not been accomplished yet. Future research should focus on detailed magnetic property analysis of fault zones including magnetic microscanning and magnetic fabric analysis. To calibrate the observations on natural fault zones, laboratory experiments should be carried out that enable to extract the exact physicochemical conditions that led to a certain magnetic signature. Potential avenues could include (1) magnetic investigations on natural and synthetic fault rocks after friction experiments, (2) laboratory simulation of fault fluid percolation, (3) paleomagnetic analysis of postkinematic remanence components associated with faulting processes, and (4) synergy of interdisciplinary approaches in mineral-magnetic studies. This would help to place our understanding of the microphysics of faulting on a much stronger footing. Plain Language Summary The Earth's surface is riddled with faults that largely contribute to landscape evolution and human activities. Some of these faults produce earthquakes of different magnitudes including some with catastrophic consequences. Understanding faulting mechanisms benefits society when predictions about rupture are made. Fault zones preserve an excellent record of chemical and physical processes involved in failure. Among other analytical methods, magnetic studies prove to be an emergent and untapped source of information on these processes. These methods, focused on prefaulting, synfaulting, and postfaulting mineral changes, have resulted in significant advances in our understanding of the conditions of faulting. In this review, we present an extensive account of the state of knowledge and highlight current challenges and future avenues of fault magnetism research.

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“… α * for Russian alloy is 33.47 · 10 −6 1/K ( T = 333 K), 34.28 · 10 −6 1/K (348 K), 35.65 · 10 −6 1/K (373 K), 35.92 · 10 −6 1/K (378 K), and 36.20 · 10 −6 1/K ( T = 383). These calculated values from Bezaeva et al [] are in accordance with our experimental data on linear thermal expansion coefficient of Russian alloy for 333 K, 348 K, and 373 K. The β values were taken from Kagramanyan [] for suitable P , T conditions (see Table ), V S ~ V L /9. Note that this overpressure linked to heating does not apply to the 0 GPa experiment as the piston was not locked allowing dilatation without pressure increase.…”

Section: Correction Of the Pressure Demagnetizing Effectmentioning

confidence: 86%

“…The initial TRM acquisition also occurs at a higher pressure than the nominal RT one. The pressure change inside the cell was first calculated as a function of applied temperature, following the model of Bezaeva et al [2015], using the thermal expansion parameters of the cell and of the PES-1 liquid:…”

Section: Correction Of the Pressure Demagnetizing Effectmentioning

confidence: 99%

“…Schult [] determined the Curie point of titanomagnetite at pressures up to 6 GPa, revealing an increase between 10 and 18 K/GPa depending on titanium content (see also Samara and Giardini [] for pure magnetite). Recently, by cycling our pressure cell from 240 to 293 K, we have shown that the hematite Morin transition temperature increases linearly with pressure up to 1.6 GPa at a rate of 25 K/GPa [ Bezaeva et al , ].…”

Section: Introductionmentioning

confidence: 99%

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Thermoremanence acquisition and demagnetization for titanomagnetite under lithospheric pressures

Launay

Rochette

Quesnel

et al. 2017

Geophysical Research Letters

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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.

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The effect of hydrostatic pressure up to 1.61 GPa on the Morin transition of hematite‐bearing rocks: Implications for planetary crustal magnetization

Cited by 6 publications

References 44 publications

The Magnetic and Color Reflectance Properties of Hematite: From Earth to Mars

The Magnetic and Color Reflectance Properties of Hematite: From Earth to Mars

Faulting Processes Unveiled by Magnetic Properties of Fault Rocks

Thermoremanence acquisition and demagnetization for titanomagnetite under lithospheric pressures

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