Magnetic sources in the Earth’s mantle

Ferré, E. C.; Kupenko, Ilya; Martín-Hernández, F.; Ravat, D.; Sanchez-Valle, Carmen

doi:10.1038/s43017-020-00107-x

Cited by 21 publications

(19 citation statements)

References 129 publications

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“…Moreover, hematite is the dominant pigment in oceanic red beds (Figure 1a), which are reddish to pinkish pelagic marine sedimentary rocks (Wang et al., 2004, 2005) that document global oceanic and climate changes during the Cretaceous greenhouse world (X. Hu, Scott, et al., 2012). High pressure and temperature experiments on hematite and its polymorphs suggest that they can be dominant magnetic carriers down to ∼600 km depth, that is, in (cold portions of) subducted slabs (Ferré et al., 2021; Kupenko et al., 2019). Two dominant kinds of hematite, specular grains and red pigment, occur in soils and red beds.…”

Section: Hematite Occurrences and Formation On Earth And Marsmentioning

confidence: 99%

“…Hu, Scott, et al, 2012). High pressure and temperature experiments on hematite and its polymorphs suggest that they can be dominant magnetic carriers down to ∼600 km depth, that is, in (cold portions of) subducted slabs (Ferré et al, 2021;Kupenko et al, 2019). Two dominant kinds of hematite, specular grains and red pigment, occur in soils and red beds.…”

Section: Hematite Occurrences On Earth and Marsmentioning

confidence: 99%

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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: Hematite Occurrences and Formation On Earth And Marsmentioning

confidence: 99%

Section: Hematite Occurrences On Earth and Marsmentioning

confidence: 99%

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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“…This information is critical to the study of the past history of the Earth’s magnetic field and is also a key tool to interpret magnetic anomalies on Earth and other rocky planetary bodies. The mineral sources and nature of remanent magnetization reflected in crustal magnetic anomalies are ongoing topics of research (Brown & McEnroe, 2008; Clark, 1999; Ferré et al., 2021; McEnroe et al., 2002, 2018; McEnroe, Brown, et al., 2009; McEnroe, Fabian, et al., 2009; McEnroe, Robinson, et al., 2001; Michels et al., 2018, 2020; Purucker & Whaler, 2007; ter Maat et al., 2019, 2020).…”

Section: Introductionmentioning

confidence: 99%

Mapping and Modeling Sources of Natural Remanent Magnetization in the Microcline–Sillimanite Gneiss, Northwest Adirondack Mountains: Implications for Crustal Magnetism

Pastore

McEnroe

Church

et al. 2021

Geochem Geophys Geosyst

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• Magnetic measurements and microscopic observation indicate exsolved titanohematite is the main source of natural remanent magnetization • Data inversions confirm magnetic enhancement from microstructure in titanohematite and weak contribution of multidomain hematite to the NRM • Inversion results are consistent with bulk measurements, and indicate little effect of alternating field demagnetization on the NRM Accepted Article This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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“…4,5 The increase of the Curie temperature of magnetite with pressure, 6,7 observed in laboratory experiments, bolstered the hypothesis that this mineral represents a primary source of upper mantle magnetization. 5 At mantle depths, magnetite can occur in multiphase solid inclusions crystallized from metamorphic fluids produced by the subduction zone dehydration of serpentinized mantle rocks. In this case, the breakdown reaction of antigorite at p−T conditions of 1.5−2.2 GPa and 640−750 °C produces metamorphic olivine and orthopyroxene that trap the fluid produced by dehydration.…”

Section: ■ Introductionmentioning

confidence: 69%

Magnetic Ordering of Magnetite Inclusions in Olivine at Mantle Depths in Subduction Zones

Campione

Murri

Cerantola

et al. 2022

ACS Earth Space Chem.

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Magnetite microinclusions in metamorphic harzburgites, derived from the deserpentinization of the subducted hydrated oceanic lithospheric mantle, were examined by synchrotron Mossbauer spectroscopy to investigate the chemical and magnetic environments of the Fe nuclei. The data reveal a critical susceptibility of the octahedral sites of the cubic structure of magnetite to chemical variations, which, in turn, influences their magnetic properties in terms of hyperfine magnetic field intensity and direction. Micromagnetites display substantial remanent magnetization; however, the magnetic moment direction can be significantly different among inclusions, even for those in close spatial proximity. This evidence points to a kinetic control of the composition of microcavities at mantle depths, implying that the use of the remanent magnetic field of included magnetic phases to infer large-scale implications on the Earth's magnetic field requires the development of complex geochemical and geodynamical models.

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Magnetic sources in the Earth’s mantle

Cited by 21 publications

References 129 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

Mapping and Modeling Sources of Natural Remanent Magnetization in the Microcline–Sillimanite Gneiss, Northwest Adirondack Mountains: Implications for Crustal Magnetism

Magnetic Ordering of Magnetite Inclusions in Olivine at Mantle Depths in Subduction Zones

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