Reconstructing the pyrite deformation mechanism map



Barrie, Craig D, Pearce, Mark A and Boyle, Alan P ORCID: 0000-0001-7316-5453
(2011) Reconstructing the pyrite deformation mechanism map. Ore Geology Reviews, 39 (4). pp. 265-276.

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Abstract

Deformation mechanism maps are important tools to understand how minerals deform across a range of pressure, temperature and strain rate conditions. Recent studies have suggested that the current deformation mechanism map for pyrite is in need of revision, with plastic deformation evident over a much wider range of conditions than it proposes. This study uses stress-strain data from experimentally deformed pyrite, combined with electron backscatter diffraction (EBSD) results from a range of experimental and natural samples to construct a revised pyrite deformation mechanism map. This map corresponds to polycrystalline pyrite with a grain size of ~35μm and suggests the onset of crystal plasticity at geological strain rates (~10-12-10-16s-1) occurs at temperatures as low as ~260°C. The revised mechanism map is based upon all available data, experimental data for pyrite are limited and acquired at geologically unreasonable, fast strain rates (10-4-10-5s-1), and strain rates for the naturally deformed samples can only be estimated. Therefore, considerable extrapolation is required and whilst this revised map is an improvement upon the existing map, it should still only be considered a 'guide' to the potential deformation mechanisms, which may operate across a range of P-T conditions in polycrystalline pyrite-rich ores. © 2011 Elsevier B.V.

Item Type: Article
Additional Information: ## TULIP Type: Articles/Papers (Journal) ##
Uncontrolled Keywords: pyrite, deformation mechanism map, experimental deformation, natural deformation, ebsd
Depositing User: Symplectic Admin
Date Deposited: 24 Jan 2020 10:16
Last Modified: 19 Jan 2023 00:08
DOI: 10.1016/j.oregeorev.2011.03.006
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3071756