Rift structures and magmatism focus VMS and gold mineralisation in the Paleoproterozoic Bryah Rift Basin, Australia

Ramos, Lara Nigro; Aitken, Alan; Occhipinti, Sandra; Lindsay, Mark

doi:10.1016/j.oregeorev.2021.104192

Cited by 2 publications

(3 citation statements)

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“…In the Noranda District, VMS and orogenic deposits are within 21.1 km and 22.8 km of a 100 Ω·m contour in the interval from ~ 1–40 km depth, respectively (Supplementary Table S3 . The spatial association between VMS and orogenic Au deposits and low-resistivity features is consistent with both mineral systems sharing the same crustal infrastructure that resulted in endowment of the ~ 30 Ma older VMS deposits, e.g., as suggested for VMS and orogenic gold mineralization in the Bryah Rift Basin, Australia 10 . The location of the two Au-rich VMS deposits within a 100 Ω·m contour, highlights their proximity to where the low-resistivity pipe-like features come to surface (Supplementary Fig.…”

Section: Metal Endowmentsupporting

confidence: 70%

“…A quantitative examination of the spatial relationship between mineral deposits and lithospheric conductivity on a global scale, showed a strong correlation between orogenic gold deposits and mid-crustal conductors, whereas VMS deposits showed a weak association with upper mantle conductors 9 . However, orogenic gold deposits have been shown to be spatially associated with the borders of magmatic centres and rift faults also spatially connected to VMS mineralization despite occurring hundreds of millions of years later 10 . Such associations point to a primary crustal architecture responsible for focusing both VMS and later gold mineralization 10 .…”

Section: Introductionmentioning

confidence: 99%

“…However, orogenic gold deposits have been shown to be spatially associated with the borders of magmatic centres and rift faults also spatially connected to VMS mineralization despite occurring hundreds of millions of years later 10 . Such associations point to a primary crustal architecture responsible for focusing both VMS and later gold mineralization 10 . Anchored in the geological and geophysical integration presented in this study, we explore the possibility that localized lithospheric mantle-scale enrichment resulting from focused, long-lived, sustained magmatic and tectonic processes may be responsible for the endowment of the Noranda District.…”

Section: Introductionmentioning

confidence: 99%

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The implications of crustal architecture and transcrustal upflow zones on the metal endowment of a world-class mineral district

Jørgensen

Gibson

Roots

et al. 2022

Sci Rep

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Earth’s mineral deposits show a non-uniform spatial distribution from the craton-scale, to the scale of individual mineral districts. Although this pattern of differential metal endowment is underpinned by lithospheric-scale processes the geological features that cause clustering of deposits remains enigmatic. The integration of geological and geophysical (seismic, gravity, and magnetotelluric) features has produced the first whole-of-crust image through an iconic Neoarchean volcanic complex and mineral district in the Abitibi Greenstone Belt, Superior Province, Canada. Observations indicate an asymmetry in surface geology, structure, and crustal architecture that defines deep transcrustal magmatic-hydrothermal upflow zones and the limits of the Noranda District ore system. Here, extreme volcanogenic massive sulfide (VMS) endowment is confined to a smaller area adjacent to an ancestral transcrustal structure interpreted to have localized and optimized magmatic and ore forming processes. Although lithospheric-scale evolutionary processes might act as the fundamental control on metal endowment, the new crustal reconstruction explains the clustering of deposits on both belt and district scales. The results highlight a strong magmatic control on metal and in particular Au endowment in VMS systems. Overprinting by clusters of ca. 30 Ma younger orogenic Au deposits suggest the ore systems accessed an upper lithospheric mantle enriched in Au and metals.

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Section: Metal Endowmentsupporting

confidence: 70%