TY - JOUR
T1 - Magnetic Ordering of Magnetite Inclusions in Olivine at Mantle Depths in Subduction Zones
AU - Campione, Marcello
AU - Murri, Mara
AU - Cerantola, Valerio
AU - Bessas, Dimitrios
AU - Rosenthal, Anja
AU - Chumakov, Aleksandr
AU - Scambelluri, Marco
AU - Malaspina, Nadia
N1 - Publisher Copyright:
© 2022 American Chemical Society.
PY - 2022/12/15
Y1 - 2022/12/15
N2 - Magnetite microinclusions in metamorphic harzburgites, derived from the deserpentinization of the subducted hydrated oceanic lithospheric mantle, were examined by synchrotron Mössbauer 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.
AB - Magnetite microinclusions in metamorphic harzburgites, derived from the deserpentinization of the subducted hydrated oceanic lithospheric mantle, were examined by synchrotron Mössbauer 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.
KW - chemical remanent magnetization
KW - geomagnetism
KW - kinetically controlled process
KW - multiphase inclusions
KW - serpentinization-induced magnetism
KW - synchrotron Mössbauer spectroscopy
KW - thermoremanent magnetization
UR - http://www.scopus.com/inward/record.url?scp=85143432845&partnerID=8YFLogxK
U2 - 10.1021/acsearthspacechem.2c00190
DO - 10.1021/acsearthspacechem.2c00190
M3 - Article
SN - 2472-3452
VL - 6
SP - 2755
EP - 2759
JO - ACS Earth and Space Chemistry
JF - ACS Earth and Space Chemistry
IS - 12
ER -