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

Piazzi, M; Morana, M; Coïsson, M; Marone, F; Campione, M; Bindi, L; Jones, AP; ... Alvaro, M; + view all (2019) Multi-analytical characterization of Fe-rich magnetic inclusions in diamonds. Diamond and Related Materials , 98 , Article 107489. 10.1016/j.diamond.2019.107489. Green open access

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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.

Type: Article
Title: Multi-analytical characterization of Fe-rich magnetic inclusions in diamonds
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.diamond.2019.107489
Publisher version: https://doi.org/10.1016/j.diamond.2019.107489
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Magnetite; Diamond; X-ray diffraction; Tomography; Alternating Field Magnetometry
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10083376
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