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Exploring the application of dual‐energy CT to discriminate sediment facies in a varved sequence.

Martini, Margherita ORCID logoORCID: https://orcid.org/0000-0002-5227-2804; Francus, Pierre ORCID logoORCID: https://orcid.org/0000-0001-5465-1966; Di Schiavi Trotta, Leonardo; Letellier, Philippe; Des Roches, Mathieu et Després, Philippe (2024). Exploring the application of dual‐energy CT to discriminate sediment facies in a varved sequence. The Depositional Record , vol. 10 , nº 1. pp. 231-244. DOI: 10.1002/dep2.271.

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Résumé

Dual‐energy X‐ray computed tomography consists of imaging objects using two incident X‐ray beams of different energy to distinguish the different compounds within a sample based on their density (electron density, ρ e ) and elemental composition (effective atomic number, Z eff ). The stoichiometric calibration for dual‐energy X‐ray computed tomography was already successfully implemented to identify single and homogeneous minerals easily and non‐destructively. It is here applied for the first time to a more complex and heterogeneous sample, a varved sediment core with three distinct facies. The output of dual‐energy X‐ray computed tomography was compared against elemental geochemistry obtained at the same resolution using a micro‐XRF core scanner. The three individual facies can be successfully differentiated using dual‐energy X‐ray computed tomography because their range of ρ e and Z eff values allow their discrimination. Correlations with elemental geochemistry are also discussed but are less conclusive, probably because of variations in grain size and porosity, and because these high resolution analyses were not performed at the exact same location. The paper not only eventually discusses the limitations when using dual‐energy X‐ray computed tomography on sediments but also demonstrates its potential to quantitatively study sediment cores in a non‐destructive way.

Type de document: Article
Mots-clés libres: 3D visualisation; debris flow; geomaterials; non-destructive analysis; turbidity; X-ray tomography
Centre: Centre Eau Terre Environnement
Date de dépôt: 31 juill. 2024 20:18
Dernière modification: 31 juill. 2024 20:18
URI: https://espace.inrs.ca/id/eprint/15495

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