Polymetallic Mineralization at the Browns Deposit, Rum Jungle Mineral Field, Northern Territory, Australia

McCready, A. J.

doi:10.2113/99.2.257

Cited by 11 publications

(9 citation statements)

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“…These have been interpreted to have formed by trapping of migrating hydrocarbons where radiation-induced radiolysis of water occurred in proximity to uranium minerals (Kyser et al, 1989). It is interesting to note that similar disordered carbon with uraninite inclusions has been reported in the Browns U-bearing Cu-Pb-Co-Ni deposit and in granites in the Rum Jungle mineral field in the western Pine Creek Orogen (McCready et al, 2003(McCready et al, , 2004.…”

Section: Hydrothermal Disordered Graphitic Carbon and Second-stage Urmentioning

confidence: 62%

The Ranger uranium deposit, northern Australia: Timing constraints, regional and ore-related alteration, and genetic implications for unconformity-related mineralisation

Skirrow

Mercadier

Armstrong

et al. 2016

Ore Geology Reviews

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Section: Hydrothermal Disordered Graphitic Carbon and Second-stage Urmentioning

confidence: 62%

The Ranger uranium deposit, northern Australia: Timing constraints, regional and ore-related alteration, and genetic implications for unconformity-related mineralisation

Skirrow

Mercadier

Armstrong

et al. 2016

Ore Geology Reviews

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“…The diagenetic history of the Depot Creek Sandstone in the Rum Jungle Mineral Field is unknown and hence, at this stage, it cannot be directly linked to the uranium deposition age at Nabarlek. McCready et al (2004) note that uranium minerals at the Browns deposit (Rum Jungle Mineral Field), are observed either in association with secondary digenite-chalcocite minerals or within postmetamorphic organic material. According to them no genetic link exists between uranium and basemetal mineralisation at this deposit.…”

Section: Age and Relative Timing Of Mineralisationmentioning

confidence: 99%

Basin-related uranium mineral systems in Australia: A review of critical features

Jaireth

Roach

Bastrakov

et al. 2016

Ore Geology Reviews

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“…Petrographic studies and Raman spectroscopy of nonuraniferous organic matter (OM) in the Whites Formation reveal the presence of both primary syngenetic OM and pre‐metamorphic epigenetic grain‐coating OM (Foster et al . 1990; McCready et al . 2003).…”

Section: Discussionmentioning

confidence: 99%

“…However, these two systems are interpreted to be genetically unrelated. In contrast, a scenario exists where the base‐metal bearing, organic‐rich shales have provided a suitable environment for the deposition of younger, genetically unrelated uranium deposition (McCready et al . 2003).…”

Section: Mineralizationmentioning

confidence: 99%

U/Th‐rich bitumen in Archean granites and Palaeoproterozoic metasediments, Rum Jungle Mineral Field, Australia: implications for mineralizing fluids

2003

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Uranium/thorium (U/Th)-rich bitumen has been discovered within both Palaeoproterozoic black pelites and the Archean granitic basement of the Rum Jungle Mineral Field, Northern Territory, Australia. Granite-hosted bitumen occurs as small (up to 400-mm diameter) discrete individual nodules, which exhibit many morphological similarities to those observed in Phanerozoic siliciclastic rocks. Thorium, the dominant radioelement, occurs primarily as a hydrated Th-Y-Si-P phase. Uranium-rich inclusions are rare, and correspond to a hydrated U-Th-Y-Si-P phase, identified as coffinite-thorogummite. Metasediment-hosted bitumen is more variable in morphology, occurring as massive (<2 cm in width) veins that cross-cut all foliations, as discrete individual nodules or as elongate seams (up to 500 mm in length), interpreted to represent a series of coalesced individual nodules. In all examples, uranium, the dominant radioelement in the metasediment-hosted bitumen, is present as Th-poor uraninite, with variable Y 2 O 3 contents (up to 3.21 wt.%).Raman investigation of all types of bitumen indicates that it is a poorly organized carbonaceous matter, which has not been subjected to metamorphism. Consequently, a post-metamorphic timing for hydrocarbon emplacement can be inferred and a magmatic origin can be precluded.Potential source rocks for the bitumen are black shales of the Whites Formation (up to 8 wt.% total organic carbon (TOC)) and the Koolpin Formation (approximately 13 wt.% TOC). Post-metamorphic sericitization of rocks within the Whites Formation is accompanied by a near-complete removal of organic matter. Alteration was possibly the catalyst for hydrocarbon generation.The Th-Y-Si-P phase within the granite-hosted nodules is interpreted to be the result of the alteration of antecedent monazite. During this alteration, U, LREE and P were fractionated and removed, while Th, Y and Si remained immobile, and recombined to form a hydrated Th-Y-Si phase. This pervasive alteration within the basement U/Thrich granites is proposed as a genetic model for the formation of uranium deposits in the Rum Jungle Mineral Field and possibly unconformity associated uranium deposits on a global scale.

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Polymetallic Mineralization at the Browns Deposit, Rum Jungle Mineral Field, Northern Territory, Australia

Cited by 11 publications

References 0 publications

The Ranger uranium deposit, northern Australia: Timing constraints, regional and ore-related alteration, and genetic implications for unconformity-related mineralisation

The Ranger uranium deposit, northern Australia: Timing constraints, regional and ore-related alteration, and genetic implications for unconformity-related mineralisation

Basin-related uranium mineral systems in Australia: A review of critical features

U/Th‐rich bitumen in Archean granites and Palaeoproterozoic metasediments, Rum Jungle Mineral Field, Australia: implications for mineralizing fluids

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