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Foliation boudinage structures in the Mount Isa Cu system

Williams, Benjamin, Blenkinsop, Thomas ORCID: https://orcid.org/0000-0001-9684-0749, Lilly, R., Thompson, M. P. and Ila'ava, P. 2023. Foliation boudinage structures in the Mount Isa Cu system. Australian Journal of Earth Sciences 10.1080/08120099.2022.2153384

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Abstract

Small-scale foliation boudinage structures occur in rocks that were sampled in drill core from the Mount Isa Cu deposit, northwest Queensland. The necks of foliation boudinage structures plunge gently to the north and south as a result of layer normal shortening and layer parallel extension of the steeply west-dipping Urquhart Shale. Detailed petrographic analysis of the foliation boudinage structures has identified an initial rim of quartz and dolomite, followed by infill and replacement by pyrrhotite and minor chalcopyrite. Foliation boudinage structures formed after dolomitisation and silicification of the shale. They occur most commonly in the unaltered Urquhart Shale where the anisotropy and homogeneity provided by the shale layering is still intact. Infilling of the structures occurred during protracted silica-dolomite alteration, pyrrhotite and chalcopyrite mineralisation. The paragenesis of the foliation boudinage structures is consistent with the established paragenesis of the main Cu mineralisation. Foliation boudinage structures formed over the period from shortening during D4a through to the main Cu mineralisation during D4b west-northwest–east-southeast sinistral-reverse shortening. The timing of foliation boudinage is consistent with a current kinematic model for the Mount Isa system

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Earth and Environmental Sciences
Publisher: Taylor and Francis Group
ISSN: 0812-0099
Funders: NERC
Date of First Compliant Deposit: 2 February 2023
Date of Acceptance: 20 November 2022
Last Modified: 15 Jun 2023 17:22
URI: https://orca.cardiff.ac.uk/id/eprint/156458

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