Abstract
Mineralised rocks in the Macraes deposit are dominated by variably graphitic micaceous shears that are shallow-dipping and formed as part of a complex thrust structure. The deposit also has two principal vein types: flat veins that are sub-parallel to shears, and laminated veins that cut steeply across the flat-lying foliation and shear fabric. Both vein types were coeval, and were coeval with evolution of the mineralised micaceous shears. Laminated veins formed as a result of stress switching in the vicinity of along-strike perturbations in the orientations of the thrust shears as a result of structural and lithological inhomogeneities.
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References
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Craw, D., MacKenzie, D. (2016). Mineralised Structures. In: Macraes Orogenic Gold Deposit (New Zealand). SpringerBriefs in World Mineral Deposits. Springer, Cham. https://doi.org/10.1007/978-3-319-35158-2_4
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DOI: https://doi.org/10.1007/978-3-319-35158-2_4
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