Re-evaluation of the petrogenesis of the Proterozoic Jabiluka unconformity-related uranium deposit, Northern Territory, Australia

Polito, Paul A.; Kyser, T. Kurt; Thomas, David J.; Marlatt, Jim; Drever, G

doi:10.1007/s00126-005-0007-9

Cited by 61 publications

(95 citation statements)

References 41 publications

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“…Isa basins in Australia [3,[47][48][49]. Results of these studies also demonstrated that age populations obtained by dating of uraninite usually match well with the timing of overprinting tectonic and magmatic processes.…”

Section: Discussionmentioning

confidence: 53%

Geochronology of Hydrothermal Processes Leading to the Formation of the Au–U Mineralization at the Rompas Prospect, Peräpohja Belt, Northern Finland: Application of Paired U–Pb Dating of Uraninite and Re–Os Dating of Molybdenite to the Identification of Multiple Hydrothermal Events in a Metamorphic Terrane

et al. 2017

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Abstract:The Peräpohja belt comprises a greenschist to amphibolite facies; multiply-folded supracrustal sequence of quartzites; mafic volcanics; carbonate rocks; black shales; mica schists and greywackes deposited from ca. 2.44 Ga to 1.92 Ga; during protracted rifting of the Archaean basement. Metamorphism and multiple folding of the basin fill occurred during the Svecofennian orogeny (1.92-1.80 Ga). The Rompas Au-U mineralization is hosted within deformed and metamorphosed calcsilicate veins in mafic volcanics. Textural evidence suggests that deposition and periods of uraninite re-mobilization were followed by localized hydrocarbon-bearing fluid flow which produced pyrobitumen crusts around grains of uraninite. Gold precipitated during the latest hydrothermal event at around 1.75 Ga. In situ U-Pb dating of uraninite by laser ablation inductively coupled mass spectroscopy (LA-ICP-MS), and Re-Os dating of molybdenite, indicate that primary hydrothermal uranium mineralization forms two age clusters; about 2.03-2.01 and 1.95-1.94 Ga. Resetting of the U-Pb system and precipitation of new generations of uraninite are associated with major deformation and metamorphic stages of the Svecofennian orogeny at 1.91-1.89 Ga, 1.85 Ga, and 1.80 Ga. Gold deposition was synchronous with the emplacement of the 1.75-1.78 Ga late/post-orogenic granitoids. The gold-producing hydrothermal event is also recorded by Re-Os dating of molybdenite from the gold-bearing Mg-metasomatized metasedimentary and metavolcanic units at the Palokas prospect; a few kilometres from Rompas. Results of this study confirm that some domains in the structure of uraninite may preserve the original crystallization age, despite an overprinting amphibolite facies metamorphic and other hydrothermal events. The study supports the utility of in situ U-Pb dating of uraninite and the ability of Re-Os dating to assist in sorting out different hydrothermal events in areas with complex tectonic; magmatic and metamorphic histories.

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Section: Discussionmentioning

confidence: 53%

Geochronology of Hydrothermal Processes Leading to the Formation of the Au–U Mineralization at the Rompas Prospect, Peräpohja Belt, Northern Finland: Application of Paired U–Pb Dating of Uraninite and Re–Os Dating of Molybdenite to the Identification of Multiple Hydrothermal Events in a Metamorphic Terrane

et al. 2017

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“…At the Ranger deposit, wallrock alteration halos and rare-earth-element fractionation patterns around the ore body have been used to interpret fluid-flow, in upward direction along structures in the basement host rock (Fisher et al, 2013). This interpretation contrasts with models of downward flowing ore fluids proposed by Wilde et al (1989), Polito et al (2005aPolito et al ( , 2005b, and for basement-hosted deposits beneath the Athabasca Basin (Kyser and Cuney, 2009 and references within).…”

Section: Fluid-flow Pathwaysmentioning

confidence: 94%

“…As the genesis of these deposits is controversial, they are not discussed in this review. More detailed descriptions of these deposits can be found in Bastrakov et al (2010), Lally and Bajwah (2006), Polito et al (2005aPolito et al ( , 2005b, and McKay and Miezitis (2001).…”

Section: Unconformity-related Uranium Mineral Systemsmentioning

confidence: 95%

“…At the Nabarlek deposit mineralisation is located along a northwest-trending reverse fault/shear zone (Wilde and Wall, 1987). At the Jabiluka deposit, mineralisation is structurally controlled within semi-brittle shears that are sub-conformable to the basement stratigraphy, and within breccias developed along the hinge zone of fault-related folds adjacent to shears (Polito et al, 2005a(Polito et al, , 2005b. The Ranger 1 deposits occur along the sheared contact (north-south trending low-angle reverse fault) between the Cahill Formation and the underlying Nanambu Complex (Lally and Bajwah, 2006).…”

Section: Faults and Shear Zonesmentioning

confidence: 99%

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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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“…The Kombolgie sub-Basin (McArthur Basin), Northern Territory, Australia, hosts very similar unconformity-related uranium deposits that were formed from comparable NaCl-rich and CaCl 2 -rich brines (Ypma and Fuzikawa, 1980;Wilde et al, 1989;Derome et al, 2003Derome et al, , 2007Polito et al, 2004Polito et al, , 2005. Continuing their use of crush-leach techniques, Derome et al (2007) found molar Cl/Br ratios between 151 and 220 in fluid inclusion leachates from quartz veins.…”

Section: Previous Studiesmentioning

confidence: 95%