Precise lead isotope fingerprinting of hydrothermal activity associated with Ordovician to Carboniferous metallogenic events in the Lachlan fold belt of New South Wales

Carr, Graham R.; Dean, Judith; Suppel, D.; Heithersay, Paul S.

doi:10.2113/gsecongeo.90.6.1467

Cited by 145 publications

(58 citation statements)

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“…up to 1040 ppm Ba, 101 ppm Rb, 843 ppm Sr), low HFSE contents (<0.60 wt% TiO 2 , <19 ppm Y, <126 ppm Zr, <7 ppm Nb, <8 ppm Hf) and very low LREE abundances (<27 ppm La, <35 ppm Ce) which are typical for potassic igneous rocks derived in late oceanic arc settings (Müller et al 1992b). Carr et al (1995) demonstrated that Pb isotope data from the mineralized Ordovician intrusions in the Lachlan Fold Belt fall into the field of modern mantle reservoirs typified by oceanic island basalts, with little to no evidence of crustal input. The elevated P 2 O 5 contents of the Cadia rocks of up to 0.43 wt% are consistent with the presence of abundant apatite microphenocrysts (Wilson et al 2003 …”

Section: Petrography and Geochemistry Of The Shoshonitic Host Rocksmentioning

confidence: 99%

Direct Associations Between Potassic Igneous Rocks and Gold-Copper Deposits in Volcanic Arcs

Müller¹,

Groves²

2015

Potassic Igneous Rocks and Associated Gold-Copper Mineralization

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Section: Petrography and Geochemistry Of The Shoshonitic Host Rocksmentioning

confidence: 99%

Direct Associations Between Potassic Igneous Rocks and Gold-Copper Deposits in Volcanic Arcs

Müller¹,

Groves²

2015

Potassic Igneous Rocks and Associated Gold-Copper Mineralization

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“…Primitive lead isotopic signature suggests a mantle-derived source for the ores and host rocks (e.g. Carr et al, 1995). Chappell (1992, 1995) indicated, based on chemical data for granitoids and rock-forming minerals, that mineralization in the Lachlan Fold Belt is strongly correlated with the redox state of granitoids, rather than S-type/I-type discrimination; Sn mineralization is related to fractionated reduced granitoids while Cu and Au mineralization is related to oxidized granitoids.…”

Section: Metallogenic Province and Redox State Of Granitoidmentioning

confidence: 99%

“…Carr et al, 1995;Glen, 1995). Gulson (1977) reported a whole-rock U-Pb age of 413 Ϯ 6 Ma for the host rock of the Woodlawn deposit, the most studied large massive sulfide deposit in the Lachlan Fold Belt.…”

Section: Fig 12 Distribution Of Tectonic Elements and Majormentioning

confidence: 99%

Sedimentary Crust and Metallogeny of Granitoid Affinity: Implications from the Geotectonic Histories of the Circum‐Japan Sea Region, Central Andes and Southeastern Australia

Sato

2012

Resource Geology

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Metallogeny of granitoid affinity was reviewed from the aspect of geotectonic history of the continental crust, particularly of the genesis of sedimentary crust involved in magmatism. The redox state of granitoids and related mineralization shows a remarkable contrast between the east and west sides of the Pacific Rim, but if examined closely, the reduced-type and oxidized-type granitoid provinces are juxtaposed in three regions: the circum-Japan Sea region, the central Andes, and the Lachlan Fold Belt in southeastern Australia. Comparative study of these regions revealed that the reduced-type magmatism associated with Sn mineralization generated in thick sedimentary crust which formed in three geotectonic environments: (i) accretionary terrane along a subduction zone (e.g. Jurassic East Asia), (ii) continental rift (e.g. Early Paleozoic Andes), and (iii) mega-fan (e.g. Early Paleozoic southeastern Australia). A collisional orogen can provide large amounts of clastic sediment to these environments. The age gap between the magmatism and sedimentation varies depending on the tectonic evolution of individual regions. Thin sedimentary crust may not play an essential role for the reduced-type magmatism. The oxidized-type magmatism associated with porphyry Cu and other mineralization generated in the crust which was initially carbon-free igneous crust or modified from sedimentary crust by magmatism. Subduction-related basaltic magmas are relatively oxidized, and may enhance fO 2 conditions of granitoid activity. Repeated magmatism in a monotonous convergent margin may be favorable for porphyry Cu mineralization as exemplified in the eastern Pacific Rim.

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“…The Copper Hill Suite dacites (Figure 3 The high e Nd(i) values, even for evolved monzodioritic compositions, indicate derivation of all the rocks analysed from isotopically primitive mantle source(s) with Nd isotopic signatures in the range for the depleted upper mantle at about 450 Ma, and preclude significant continental crustal involvement in magma genesis (Barron et al 1991;Wyborn & Sun 1993;Carr et al 1995;Crawford et al 2007). The Ordovician volcanic and intrusive rocks from the Cadia -Neville region were thus emplaced in an oceanic setting.…”

Section: Medium-k Calc-alkaline Suitementioning

confidence: 99%

Magmatic characteristics and geochronology of Ordovician igneous rocks from the Cadia – Neville region, New South Wales: implications for tectonic evolution

Squire

Crawford

2007

Australian Journal of Earth Sciences

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The Ordovician volcanic and intrusive rocks of the Cadia -Neville region, in the southern Molong Volcanic Belt section of the Macquarie Arc in central-western New South Wales, display a temporal progression from shoshonitic basaltic volcanism (e.g. Mt Pleasant Basalt Member) in the late Darriwilian to Gisbornian (ca 460 -453 Ma) to small-volume dacitic medium-K calc-alkaline magmatism (e.g. Copper Hill-type dacite) in the late Eastonian to early Bolindian (ca 450 -445 Ma) to large-volume, high-K calc-alkaline to shoshonitic, mafic to highly evolved magmatism (e.g. Nullawonga Latite Member and Cadia Intrusive Complex) at about 445 -440 Ma. The two episodes of shoshonitic magmatism are separated by at least 15 (but up to *20) million years, during which time limestones, associated with regional uplift, were deposited broadly coincident with emplacement of the medium-K calc-alkaline dacitic intrusions. Despite this, the lavas and intrusions associated with both episodes of shoshonitic magmatism have strikingly similar geochemistry, indicating that a similar mantle source and partial melting processes were involved over this time interval. The arc-type geochemistry of the volcanic and intrusive rocks in the Cadia -Neville region is very similar to the lavas and intrusions forming the Pliocene Tavua Caldera in Viti Levu, Fiji. The Pliocene shoshonitic rocks at Tavua Caldera were emplaced following cessation of arc magmatism when the arc moved into an extensional phase. By analogy with the Pliocene tectonic setting in Fiji, the arc-like signature of the Ordovician magmas of the Macquarie Arc may be due to preprocessing of the mantle above a subduction zone prior to extension and fragmentation of arc lithosphere that led to generation of the subduction-modified shoshonite-dominated magmas.

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Precise lead isotope fingerprinting of hydrothermal activity associated with Ordovician to Carboniferous metallogenic events in the Lachlan fold belt of New South Wales

Cited by 145 publications

References 0 publications

Direct Associations Between Potassic Igneous Rocks and Gold-Copper Deposits in Volcanic Arcs

Direct Associations Between Potassic Igneous Rocks and Gold-Copper Deposits in Volcanic Arcs

Sedimentary Crust and Metallogeny of Granitoid Affinity: Implications from the Geotectonic Histories of the Circum‐Japan Sea Region, Central Andes and Southeastern Australia

Magmatic characteristics and geochronology of Ordovician igneous rocks from the Cadia – Neville region, New South Wales: implications for tectonic evolution

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