Micromagnetic Modes of Anisotropy of Magnetic Susceptibility in Natural Magnetite Particles

Nikolaisen, Even; Fabian, Karl; Harrison, R. J.; McEnroe, Suzanne A.

doi:10.1029/2022gl099758

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…7 ). Recent studies combining nanotomography with micromagnetic modelling have demonstrated how anisotropy can be identified and calculated from first principles [39][40][41] . Accounting for anisotropy is particularly important in assessing the results of paleomagnetic microconglomerate tests.…”

Section: Assessing the Paleomagnetic Potential Of Zirconmentioning

confidence: 99%

Nanoscale imaging of Fe-rich inclusions in single-crystal zircon using X-ray ptycho-tomography

Kuppili,

Ball,

Batey

et al. 2024

Sci Rep

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We apply X-ray ptycho-tomography to perform high-resolution, non-destructive, three-dimensional (3D) imaging of Fe-rich inclusions in paleomagnetically relevant materials (zircon single crystals from the Bishop Tuff ignimbrite). Correlative imaging using quantum diamond magnetic microscopy combined with X-ray fluorescence mapping was used to locate regions containing potential ferromagnetic remanence carriers. Ptycho-tomographic reconstructions with voxel sizes 85 nm and 21 nm were achievable across a field-of-view > 80 µm; voxel sizes as small as 5 nm were achievable over a limited field-of-view using local ptycho-tomography. Fe-rich inclusions 300 nm in size were clearly resolved. We estimate that particles as small as 100 nm—approaching single-domain threshold for magnetite—could be resolvable using this “dual-mode” methodology. Fe-rich inclusions (likely magnetite) are closely associated with apatite inclusions that have no visible connection to the exterior surface of the zircon (e.g., via intersecting cracks). There is no evidence of radiation damage, alteration, recrystallisation or deformation in the host zircon or apatite that could provide alternative pathways for Fe infiltration, indicating that magnetite and apatite grew separately as primary phases in the magma, that magnetite adhered to the surfaces of the apatite, and that the magnetite-coated apatite was then encapsulated as primary inclusions within the growing zircon. Rarer examples of Fe-rich inclusions entirely encapsulated by zircon are also observed. These observations support the presence of primary inclusions in relatively young and pristine zircon crystals. Combining magnetic and tomography results we deduce the presence of magnetic carriers that are in the optimal size range for carrying strong and stable paleomagnetic signals but that remain below the detection limits of even the highest-resolution X-ray tomography reconstructions. We recommend the use of focused ion beam nanotomography and/or correlative transmission electron microscopy to directly confirm the presence of primary magnetite in the sub 300 nm range as a necessary step in targeted paleomagnetic workflows.

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Section: Assessing the Paleomagnetic Potential Of Zirconmentioning

confidence: 99%

Nanoscale imaging of Fe-rich inclusions in single-crystal zircon using X-ray ptycho-tomography

Kuppili,

Ball,

Batey

et al. 2024

Sci Rep

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Fracture response and damage evolution features of coal considering the effect of creep damage under dynamic loading

Ding

Feng

Wang

et al. 2023

Engineering Failure Analysis

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Focal mechanism of a Late Triassic large magnitude earthquake along the Longmen Shan fault belt, eastern Tibetan Plateau

Zhang,

Li,

Ferré

et al. 2024

Journal of Structural Geology

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Micromagnetic Modes of Anisotropy of Magnetic Susceptibility in Natural Magnetite Particles

Abstract: Anisotropy of magnetic susceptibility (AMS) is a trusted magnetic technique in studies of petrofabric and structural geology (

Cited by 3 publications

References 27 publications

Nanoscale imaging of Fe-rich inclusions in single-crystal zircon using X-ray ptycho-tomography

Nanoscale imaging of Fe-rich inclusions in single-crystal zircon using X-ray ptycho-tomography

Fracture response and damage evolution features of coal considering the effect of creep damage under dynamic loading

Focal mechanism of a Late Triassic large magnitude earthquake along the Longmen Shan fault belt, eastern Tibetan Plateau

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