Postshock Thermally Induced Transformations in Experimentally Shocked Magnetite

Kontny, A.; Reznik, B.; Boubnov, A.; Gottlicher, J.; Steininger, R.

doi:10.1002/2017gc007331

Title: Postshock Thermally Induced Transformations in Experimentally Shocked Magnetite

Journal Article · Mon Mar 12 00:00:00 EDT 2018 · Geochemistry, Geophysics, Geosystems

DOI:https://doi.org/10.1002/2017gc007331· OSTI ID:1461951

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^[1]; Boubnov, A. ^[2]; Gottlicher, J. ^[3]; Steininger, R. ^[3]

Karlsruhe Inst. of Technology (KIT) (Germany). Inst. of Applied Geosciences
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Karlsruhe Inst. of Technology (KIT), Eggenstein-Leopoldshafen (Germany). Synchrotron Radiation Facility ANKA

We studied the effect of 973 K heating in argon atmosphere on the magnetic and structural properties of a magnetite-bearing ore, which was previously exposed to laboratory shock waves between 5 and 30 GPa. For this purpose magnetic properties were studied using temperature-dependent magnetic susceptibility, magnetic hysteresis and low-temperature saturation isothermal remanent magnetization. Structural properties of magnetite were analyzed using X-ray diffraction, high-resolution scanning electron microscopy and synchrotron-assisted X-ray absorption spectroscopy. The shock-induced changes include magnetic domain size reduction due to brittle and ductile deformation features and an increase in Verwey transition temperature due to lattice distortion. After heating, the crystal lattice is relaxed and apparent crystallite size is increased suggesting a recovery of lattice defects documented by a mosaic recrystallization texture. The structural changes correlate with modifications in magnetic domain state recorded by temperature-dependent magnetic susceptibility, hysteresis properties and low-temperature saturation isothermal remanent magnetization. In conclusion, these alterations in both, magnetic and structural properties of magnetite can be used to assess impact-related magnetic anomalies in impact structures with a high temperature overprint.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; German Research Foundation (DFG)

Grant/Contract Number:: AC02-76SF00515; KO1514/8-1

OSTI ID:: 1461951

Journal Information:: Geochemistry, Geophysics, Geosystems, Vol. 19, Issue 3; ISSN 1525-2027

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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