Controls on Devonian–Carboniferous magmatism in Tasmania, based on inherited zircon age patterns, Sr, Nd and Pb isotopes, and major and trace element geochemistry

Black, Lachlan E.; Everard, John L.; McClenaghan, M.P.; Korsch, R. J.; Calver, Clive R.; Fioretti, A. M.; Brown, Antony V.; Foudoulis, Chris

doi:10.1080/08120099.2010.509407

Cited by 46 publications

(16 citation statements)

References 60 publications

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“…Similar modern and ancient packages lie on older cratonic basements (e.g., Jones et al, 2011). Black et al (2010) found that the Paleozoic western Tasmanian granites had an excess of 1600 Ma zircons when compared to the Rocky Cape Group, implying a basement with excess zircons of that age. Two-stage Nd model ages on granites that intruded the Rocky Cape Group gave ages of 1530 and 1780 Ma, and all other granite model ages in western Tasmania are younger than 2100 Ma (Champion, 2013).…”

mentioning

confidence: 84%

Mesoproterozoic Tasmania: Witness to the East Antarctica–Laurentia connection within Nuna: COMMENT

Moore

Betts

2016

Geology

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mentioning

confidence: 84%

Mesoproterozoic Tasmania: Witness to the East Antarctica–Laurentia connection within Nuna: COMMENT

Moore

Betts

2016

Geology

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“…They are not coeval with the Devonian to Carboniferous granitoids found in south-western New Guinea ( Fig. 13; Richards and Willmott, 1970), but may potentially be part of a broader Devonian and Carboniferous orogenic belt and associated granitoid and volcanic rocks found through parts of eastern Australia and New Zealand (e.g., Black et al, 2010;Kositcin et al, 2015;Muir et al, 1996;Raymond and Sun, 1998, and references therein).…”

Section: Submitted To Lithosmentioning

confidence: 98%

The Mesozoic and Palaeozoic granitoids of north-western New Guinea

Jost¹,

Webb²,

White³

2018

Preprint

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A large portion of the Bird's Head Peninsula of NW New Guinea is an inlier that reveals the pre-Cenozoic geological history of the northern margin of eastern Gondwana. The peninsula is dominated by a regional basement high exposing Gondwanan ('Australian') Palaeozoic metasediments intruded by Palaeozoic and Mesozoic granitoids. Here, we present the first comprehensive study of these granitoids, including field and petrographic descriptions, bulk rock geochemistry, and U-Pb zircon age data. We further revise and update previous subdivisions ofgranitoids in the area. Most granitoids were emplaced as small to medium scale intrusions during two episodes in the Devonian-Carboniferous and the Late Permian-Triassic, separated by a period of apparent magmatic quiescence. The oldest rocks went unrecognised until this study, likelydue to the younger intrusive events resetting the K¬-Ar isotopic system used in previous studies. Most of the Palaeozoic and Mesozoic granitoids are peraluminous and in large parts derived from partial melts of the country rock. This is corroborated by local migmatites and country rockxenoliths. Although rare, the metaluminous and mafic rocks show that partial melts of mantle-derived material played a minor role in granitoid petrogenesis, especially during the Permian-Triassic. The Devonian-Carboniferous granitoids and associated volcanics are locally restricted, whereas the Permian-Triassic intrusions are found across NW New Guinea and further afield. The latter were likely part of an extensive active continental margin above a subduction system spanning the length of what is now New Guinea and likely extending southward through easternAustralia and Antarctica.

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“…U-Pb analyses of detrital zircon indicate the source of the Mathinna Supergroup was not the Western Tasmanian terrane (Black et al, 2004). The current models suggest that northeastern Tasmania may have been substantially separated from the rest of Tasmania at the time of its deposition, and that it was finally docked with western Tasmania during Middle Devonian orogenesis (e.g., Black et al, 2010).…”

Section: Figure 3 Broad Geological Subdivisions Of the Mount Read Volmentioning

confidence: 82%

“…Granites associated with Sn mineralisation contain evidence of a component of mantle melts and volatiles (e.g., Sun and Higgins, 1996;Solomon and Groves, 1994;Walshe et al, 1996), which may have been related to mafic underplating of the crust associated with postcollisional slab break-off (Black et al, 2010).…”

Section: Figure 5 Location Of Significant Devonian Granite Related Dementioning

confidence: 99%

Ore Deposits and Metallogenesis of Tasmania

Green

2012

Episodes

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present and there have been at least four major episodes of economic mineralisation. Significant mineral deposits include Proterozoic magnetite, silica, dolomite and magnesite deposits; Cambrian VHMS base metal-Au and ultramafic-related Pt-group minerals (PGM) and chromite deposits; Devonian orogenic and intrusion related Au deposits; Middle Devonian-Tournaisian granite-related Sn, W, fluorite, magnetite, Ag-Pb-Zn and Ni deposits; Triassic coal and Oligocene-Miocene lignite deposits; and Cenozoic alluvial Au, Sn and PGM deposits, and residual Ni-Co, Fe oxide, silica and clay deposits. Resource data are listed in Table 1. This contribution is abbreviated from Seymour et al., (2006; revised 2007), but updated. Cambrian Orogenesis, ultramafics, the Arthur Lineament and associated mineralisation The major collisional Tyennan Orogeny occurred between c. 512-506 Ma (Turner et al., 1998), contemporaneous with the first phase Tasmania contains a broad variety of economic mineral deposits, which includes several that have been known for over a century and are still operating today or were worked in the recent past. The Arthur Lineament, a belt of allochthonous amphibolite, carbonate rocks, psammite and pelite in northwest Tasmania hosts the Savage River magnetite deposit, which is now considered to be a Proterozoic carbonate replacement deposit with affinities to Kiruna-style iron-oxide Cu-Au deposits. The allochthon was formed during an early Cambrian collisional event between an east-facing passive margin sequence and an intraoceanic island arc. Post collisional, proximal submarine volcanism at c. 500 Ma in the Mount Read Volcanics followed and associated mineralisation includes world-class deposits. High grade Zn-Pb-Au-Ag-Cu massive sulfide deposits (e.g., Rosebery and Hellyer) were formed from seawater-dominated hydrothermal fluids. Disseminated Cu-Au-Ag deposits of the Mount Lyell field are associated with broad alteration zones that include phyllosilicate assemblages indicative of a component of oxidised magmatic fluid, as does the Henty Au deposit in the north. Orogenic Au is an important deposit style in northeast Tasmania and includes the Tasmania deposit, Australia's largest single Au reef. Largely post-orogenic granitic magmatism (Lower Devonian-Tournaisian) includes an important Sn-Wbase metal±magnetite mineralising event associated with reduced, fractionated granite in northeast and western Tasmania. World class Sn±Cu sulfide skarn and vein deposits are the product of interpreted magmatic fluids exsolved from these granitic magmas. The highly unusual disseminated Avebury Ni deposit is associated with granite of this type. World class scheelite skarn deposits on King Island lie in the contact aureole of moderately oxidised, unfractionated Tournaisian granodiorite on King Island.

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Controls on Devonian–Carboniferous magmatism in Tasmania, based on inherited zircon age patterns, Sr, Nd and Pb isotopes, and major and trace element geochemistry

Cited by 46 publications

References 60 publications

Mesoproterozoic Tasmania: Witness to the East Antarctica–Laurentia connection within Nuna: COMMENT

Mesoproterozoic Tasmania: Witness to the East Antarctica–Laurentia connection within Nuna: COMMENT

The Mesozoic and Palaeozoic granitoids of north-western New Guinea

Ore Deposits and Metallogenesis of Tasmania

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