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Conference Proceedings

PACRIM 2019

Conference Proceedings

PACRIM 2019

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Spatial and temporal controls on mineral systems

Opening up greenfields regions for minerals exploration programs is facilitated through understanding their mineral prospectivity. The Capricorn Orogen (Fig. 1) is a greenfields-dominated region, with several mineral occurrences or deposits in the region but with few areas that have been mined extensively. Mineralisation in much of the Capricorn Orogen can be related to basin development, inversion and orogenesis during the Paleoproterozoic. These changing conditions reflect the transition from a plate-margin setting to an intraplate setting in the Capricorn Orogen. Extension, on a regional scale dominates the tectonic processes observed in the area through time leading to volcanosedimentary basin development interspersed by shorter periods of compression, including the 20051950 Ma Glenburgh and 18301780 Ma Capricorn orogenies. Early extension along the northern Yilgarn Craton resulted in the formation of the Yerrida and Earaheedy Basins and Bryah Sub-basin. The Bryah Sub-basin contains at least 6km thick mafic volcanic and intrusive pile suggesting that Archean lithosphere was mechanically and chemically modified under this basin (Occhipinti et al., 2017). Prospectivity models for base metals and gold for the southern part of the Capricorn Orogen suggest there is a spatial link between these, proximity to Archean basement as well as between base metals and gold mineralisation. The continued presence of deep crustal-scale tectonic architecture that controlled basin development and subsequent inversion during orogenesis is one of these links. The Archean lithosphere may have also provided protection from tectonothermal processes such as deep burial and metamorphism, allowing preservation of deposits. The spatial unanimity of c. 2 Ga Au-Cu volcanic massive sulphide and c. 1.8 Ga orogenic Au style mineralisation in the northern part of the Bryah Sub-basin suggests a spatial link between mineralising systems, whilst supporting the fact that the generation of different ore styles is mainly driven by large-scale geodynamic processes. CITATION: Occhipinti, S A, Lindsay, M D, Metelka, V and Aitken, A R A, 2019. Spatial and temporal controls on mineral systems, in Proceedings PACRIM 2019, pp 107110 (The Australasian Institute of Mining and Metallurgy: Melbourne).
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  • Published: 2019
  • PDF Size: 1.422 Mb.
  • Unique ID: P201901032

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