Creus, P.K., Sanislav, I.V., and Dirks, P.H.G.M. (2024) 3D geometry of the Dugald River Shear Zone, Mount Isa Inlier, Australia. Australian Journal of Earth Sciences. (In Press)

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Abstract

The Dugald River Shear Zone is a structurally complex, anastomosing shear zone that hosts high-grade Zn mineralisation within the Dugald River Slate. The Dugald River Zn–Pb–Ag mine is situated within the Mount Isa Inlier, Australia and developed through two phases of mineralisation with high-grade Zn mineralisation intimately associated with the development of the brittle–ductile Dugald River Shear Zone. The first phase of mineralisation occurred during the regionally extensive, D2 ductile fold and axial planar cleavage forming event and resulted in the development of a sulfide horizon. This horizon was a preferential site for strain partitioning during early D4 ductile deformation, which resulted in transposition-related concentration and thickening of a sulfide horizon marking the second phase of mineralisation. The Dugald River Shear Zone developed during D4 wherein strain rate incompatibilities between a ductile-deforming sulfide horizon and the brittle-deforming Dugald River Slate resulted in the development of a Riedel shear zone. A high-resolution 3D model of the shear zone was constructed from robust drilling and mapping datasets in which releasing and restraining bends highlight the thickening and thinning of ore lenses, respectively. The 3D model with detailed structural analysis and observations allows for predictive modelling of dilational zones within throughgoing Y-shears, which are prospective sites for remobilisation of high-grade Zn sulfides as the ore body developed coevally with progressive shearing.

Item ID:	83923
Item Type:	Article (Research - C1)
ISSN:	1440-0952
Copyright Information:	© 2024 the Author(s). Published by Informa UK limited, trading as taylor & francis Group. This is an open Access article distributed under the terms of the creative commons Attribution-noncommercial-noDerivatives license (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent.
Date Deposited:	29 Oct 2024 03:18
FoR Codes:	37 EARTH SCIENCES > 3705 Geology > 370508 Resource geoscience @ 40% 37 EARTH SCIENCES > 3705 Geology > 370511 Structural geology and tectonics @ 60%
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