Proterozoic mafic–ultramafic intrusions in the Arunta Region, central AustraliaPart 2: Event chronology and regional correlations

Claoué-Long, Jonathan C.; Hoatson, Dean M.

doi:10.1016/j.precamres.2005.08.006

Cited by 56 publications

(31 citation statements)

References 32 publications

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“…Paleoproterozoic orogenesis in the Rudall Province during the 1790-1760 Ma Yapungku Orogeny (Smithies and Bagas, 1997) and the 1780-1770 Ma Yamba Event (Collins and Shaw, 1995;Claoué-Long and Hoatson, 2005) are commonly interpreted to represent the assembly of the North and West Australian Cratons into a single entity (The NAWAC). The 1820-1770 Ma intraplate Capricorn Orogeny is a further response to this collision (Sheppard et al, 2010).…”

Section: The North and West Australian Craton (Nawac) And Associated mentioning

confidence: 99%

“…The Aileron Province has formed on the southern margin of the North Australian Craton and preserves a mostly Paleoproterozoic evolution, including the 1780-1770 Ma Yamba Event, which is correlated with the Yapunkgu Event of the Rudall Province (Collins and Shaw, 1995;Claoué-Long and Hoatson, 2005). Subsequent events include high-grade metamorphism and granitic magmatism during the 1730 -1690 Ma Strangways Orogeny, and further high grade metamorphism during the ca.…”

Section: The Arunta Orogenmentioning

confidence: 99%

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The Australo-Antarctic Columbia to Gondwana transition

et al. 2016

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Section: The North and West Australian Craton (Nawac) And Associated mentioning

confidence: 99%

Section: The Arunta Orogenmentioning

confidence: 99%

The Australo-Antarctic Columbia to Gondwana transition

et al. 2016

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“…The end of this event is marked by regional extension and intrusion of the Strangways Range dolerite dyke swarm at ca. 1690 Ma (Shaw et al 1984;Claoué-Long and Hoatson 2005;Claoué-Long et al 2008). 6.…”

Section: Regional Geologymentioning

confidence: 99%

“…450-300 Ma-the Alice Springs Orogeny: the youngest tectonic event to affect the Reynolds Range region (Roberts and Houseman 2001;Claoué-Long et al 2008;Raimondo et al 2011). This intraplate orogenic event is deemed to be responsible for most of the current topography and the current juxtaposition of granulite and greenschist facies Proterozoic rocks in the region (Claoué-Long and Hoatson 2005). Tectonic activity involved north-south shortening, most of which was accommodated by deformation and uplift of the region via the reactivation of the Redbank Shear Zone (Hand and Sandiford 1999;Roberts and Houseman 2001) and initiation of other large (>100 m wide) hydrous shear zones (Collins and Teyssier 1989;Raimondo et al 2011;Anderson et al 2013).…”

Section: Regional Geologymentioning

confidence: 99%

Genesis of the central zone of the Nolans Bore rare earth element deposit, Northern Territory, Australia

Schoneveld

Spandler

Hussey³

2015

Contrib Mineral Petrol

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north and south-east zones. Breccia types BX2, BX3, and BX4 represent progressive stages of ore brecciation and development of calc-silicate mineral (amphibole, epidote, allanite, calcite) infill. Comparison of bulk ore sample geochemistry between breccia types indicates that REEs were not mobilised more than a few centimetres during hydrothermal alteration and brecciation. Instead, most of the REEs were partitioned from the original REE fluorapatite into newly formed allanite, REE-poor fluorapatite and minor REE carbonate in the breccias. Negative europium (Eu) anomalies in the breccia minerals are accounted for by a large positive Eu anomaly in epidote from the alteration zones surrounding the ore breccias. This observation provides a direct link between ore recrystallisation and brecciation, and the formation of the alteration halo in the surrounding host rocks. Where allanite and fluorapatite are texturally related, the fluorapatite is relatively depleted in the light rare earth elements (LREEs), whereas allanite is relatively LREE enriched, suggesting co-crystallisation. We tentatively date the BX1 ore stage to 1440 ± 80 Ma based on U-Pb dating of thorianite. Sm-Nd isotope isochrons derived from in situ isotope analysis of cognate apatite and allanite date the BX2 and BX3 events to ca. 400 Ma, while U-Pb dating of late-stage monazite from the BX4 ore stage returned an age of ca. 350 Ma. Therefore, formation of the central zone at Nolans Bore involved multiple alteration/brecciation events that collectively span over 1 billion years in duration. We suggest that the BX1-type veins and breccias were formed from REE-rich, saline (Fand Cl-bearing) fluids that infiltrated the granulite-grade host rocks in association with either shear activation events of the Redbank Shear Zone (1500-1400 Ma) or intrusion of late-stage pegmatites of the Mt Boothby area. BX2, BX3, and BX4 events record deformation and hydrothermal alteration associated with the Alice Springs Orogeny Abstract The Nolans Bore rare earth element (REE) deposit consists of a network of fluorapatite-bearing veins and breccias hosted within Proterozoic granulites of the Reynolds Range, Central Australia. Mineralisation is divided into three zones (north, central, and south-east), with the north and south-east zones consisting of massive REE-bearing fluorapatite veins, with minor brecciation and carbonate infill. The central zone is distinctively different in mineralogy and structure; it features extensive brecciation, a high allanite content, and a large, epidote-rich enveloping alteration zone. The central zone is a reworking of the original solid apatite veins that formed during the Chewings Orogeny at ca. 1525 Ma. These original apatite veins are thought to derive from phosphate-rich magmatic-hydrothermal fluid exsolved from as-yet unrecognised alkaline magmatic bodies at depth. We define four ore breccia types (BX1-4) in the central zone on the basis of detailed petrological and geochemical analysis of drillcore and thin sections. BX1 ore comprises fl...

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“…The Mount Charles Formation was deposited at a time of localised extension during the regional Stafford Event (Claoué-Long and Hoatson 2005;Cawood and Korsch 2008) (Fig. 9).…”

Section: Mount Charles Formation; Eventmentioning

confidence: 99%

Typecasting prospective Au-bearing sedimentary lithologies using sedimentary geochemistry and Nd isotopes in poorly exposed Proterozoic basins of the Tanami region, Northern Australia

2010

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The development of a regional stratigraphy in Palaeoproterozoic basins within the Tanami region, Northern Australia has been hindered by the difficulty of discriminating sedimentary units and facies across this isolated and poorly exposed basin. A regional stratigraphy is important as it provides constraints on sedimentary basin evolution and assists in gold exploration. Gold is known to be more concentrated in certain rock formations. Based on Nd isotopes and whole-rock geochemistry, five main sedimentary events have been identified in the Tanami region. Some sedimentary units were derived from homogeneous local sources whereas others contain evidence of a well-mixed fine-grained remote provenance. Within the basins, major gold-bearing lithologies are characterised by mafic source indicators: (1) high Cr/Th ratios; (2) low Th/Sc ratios; (3) low (La/Yb) PAAS ratios relative to Post-Archaean Average Shale (Taylor and McLennan 1985); (4) Eu anomalies equal to ~1 and, (5) distinctive ranges in initial  Nd values. Potential future exploration target areas have been identified in the Tanami region at the Cashel and Sunline prospects using these geochemical parameters.

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Proterozoic mafic–ultramafic intrusions in the Arunta Region, central AustraliaPart 2: Event chronology and regional correlations

Cited by 56 publications

References 32 publications

The Australo-Antarctic Columbia to Gondwana transition

The Australo-Antarctic Columbia to Gondwana transition

Genesis of the central zone of the Nolans Bore rare earth element deposit, Northern Territory, Australia

Typecasting prospective Au-bearing sedimentary lithologies using sedimentary geochemistry and Nd isotopes in poorly exposed Proterozoic basins of the Tanami region, Northern Australia

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