Magnetic mineral inclusions, as iron oxides or sulfides, occur quite rarely in natural diamonds. Nonetheless, they represent a key tool not only to unveil the conditions of formation of host diamonds, but also to get hints about the paleointensity of the geomagnetic field present at times of the Earth's history otherwise not accessible. This possibility is related to their capability to carry a remanent magnetization dependent on their magnetic history. However, comprehensive experimental studies on magnetic inclusions in diamonds have been rarely reported so far. Here we exploit X-ray diffraction, Synchrotron-based X-ray Tomographic Microscopy and Alternating Field Magnetometry to determine the crystallographic, morphological and magnetic properties of ferrimagnetic Fe-oxides entrapped in diamonds coming from Akwatia (Ghana). We exploit the methodology to estimate the natural remanence of the inclusions, associated to the Earth's magnetic field they experienced, and to get insights on the relative time of formation between host and inclusion systems. Furthermore, from the hysteresis loops and First Order Reversal Curves we determine qualitatively the anisotropy, size and domain state configuration of the magnetic grains constituting the inclusions.

Piazzi, M., Morana, M., Coïsson, M., Marone, F., Campione, M., Bindi, L., et al. (2019). Multi-analytical characterization of Fe-rich magnetic inclusions in diamonds. DIAMOND AND RELATED MATERIALS, 98 [10.1016/j.diamond.2019.107489].

Multi-analytical characterization of Fe-rich magnetic inclusions in diamonds

Campione, Marcello;
2019

Abstract

Magnetic mineral inclusions, as iron oxides or sulfides, occur quite rarely in natural diamonds. Nonetheless, they represent a key tool not only to unveil the conditions of formation of host diamonds, but also to get hints about the paleointensity of the geomagnetic field present at times of the Earth's history otherwise not accessible. This possibility is related to their capability to carry a remanent magnetization dependent on their magnetic history. However, comprehensive experimental studies on magnetic inclusions in diamonds have been rarely reported so far. Here we exploit X-ray diffraction, Synchrotron-based X-ray Tomographic Microscopy and Alternating Field Magnetometry to determine the crystallographic, morphological and magnetic properties of ferrimagnetic Fe-oxides entrapped in diamonds coming from Akwatia (Ghana). We exploit the methodology to estimate the natural remanence of the inclusions, associated to the Earth's magnetic field they experienced, and to get insights on the relative time of formation between host and inclusion systems. Furthermore, from the hysteresis loops and First Order Reversal Curves we determine qualitatively the anisotropy, size and domain state configuration of the magnetic grains constituting the inclusions.
Articolo in rivista - Articolo scientifico
Magnetite, Diamond, X-ray diffraction, Tomography, Alternating Field Magnetometry
English
2019
98
107489
none
Piazzi, M., Morana, M., Coïsson, M., Marone, F., Campione, M., Bindi, L., et al. (2019). Multi-analytical characterization of Fe-rich magnetic inclusions in diamonds. DIAMOND AND RELATED MATERIALS, 98 [10.1016/j.diamond.2019.107489].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/240384
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