Ordovician to earliest Silurian history of the Macquarie Arc, Lachlan Orogen, New South Wales

Percival, Ian G.; Glen, R. A.

doi:10.1080/08120090601146789

Cited by 82 publications

(52 citation statements)

References 54 publications

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“…Governor Fault Zone (GOZ): Howqua, Dookie, and Dolodrook bodies from Crawford and Keays (1987), Crawford (1988), Tickell (1989), VandenBerg et al (2000), Crawford et al (2003b), Spaggiari et al (2003aSpaggiari et al ( , 2003b. Macquarie Volcanic Province from Percival and Glen (2007). Narooma Zone (Nar) from Glen et al (2004).…”

Section: Pre 540 Ma Development: Rift and Passive Margin Phase (Earlymentioning

confidence: 99%

Different styles of modern and ancient non-collisional orogens and implications for crustal growth: a Gondwanaland perspective

2016

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Non-collisional, convergent margin orogens are generally called accretionary orogens, although there may not have been horizontal accretion across the plate boundary. We revive the term non-collisional orogen and use a Gondwanaland perspective to discuss different types. On the northern margin of the Australian Plate, the New Guinea non-collisional, accretionary orogen was formed by large-scale terrane accretion across an advancing plate margin. On the eastern margin, the Southwest Pacific Orogen is a non-collisional and non-accretionary orogen, involving virtually no horizontal transfer of material across its eastward-retreating plate boundary. In the Tasmanides, the Lachlan Orogen, commonly described as an accretionary orogen, is another non-collisional, non-accretionary orogen developed behind the plate margin after major Cambrian rollback, with resultant backarc basins filled mainly by quartz-rich turbidites subsequently recycled. The outboard New England Orogen is a non-collisional but accretionary orogen, marked by the frontal accretion of continental margin arc detritus, subsequently recycled into younger arcs. The Permian to Cretaceous Rangitata Orogen of New Zealand is an ?oblique non-collisional, accretionary orogen in which Permian-Triassic sediments of the accretionary wedge have no link with inboard (near) arc terranes. Late Jurassic to Cretaceous parts were sourced by a combination of first cycle volcanogenic detritus passing through the forearc basin together with recycling of the exhumed parts of the wedge. All non-collisional orogens involve continental growth, but only the New England Orogen and to a lesser extent the New Guinea Orogen involve significant crustal growth.

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Section: Pre 540 Ma Development: Rift and Passive Margin Phase (Earlymentioning

confidence: 99%

Different styles of modern and ancient non-collisional orogens and implications for crustal growth: a Gondwanaland perspective

2016

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“…Murray and Stewart (2001) also documented Early Ordovician chert in the southern Rockley-Gulgong Volcanic Belt that indicates deep-marine conditions and are overlain by undated mafic to intermediate volcaniclastic rocks. Meffre et al (2007) and Percival and Glen (2007) suggested that these rocks are fault-bounded and part of the Ordovician quartz turbidite succession, in spite of the lack of quartz turbidites in the unit and its conformable upper contact as determined by the detailed mapping of Murray (2002). Other components of Phase 1 activity have been identified at Lake Cowal, and southwest of Narromine, but these areas lack age-specific fossils and/or radiometric ages of Early Ordovician age that confirm these correlations (Percival & Glen 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, Percival and Glen (2007, figure 2) show Phase 4 magmatism beginning at different times in different areas in the Eastonian to earliest Bolindian. Whereas Crawford et al (2007b, figure 2) showed Phase 4 magmatism as occurring throughout the Eastonian in the eastern Molong Volcanic Belt and the Rockley-Gulgong Volcanic Belt.…”

Section: Introductionmentioning

confidence: 99%

Tectonic evolution of the Ordovician Macquarie Arc, central New South Wales: arguments for subduction polarity and anticlockwise rotation

Fergusson¹

2009

Australian Journal of Earth Sciences

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The Ordovician Macquarie Arc is most widely exposed in the Lachlan Fold Belt of central New South Wales. Complex relationships between the arc and the Ordovician turbidite mega-fan are partly explained by anticlockwise rotation of the arc during the Ordovician. Thus, initially two lobes of the mega-fan formed to the north and south of the east-west trending arc, using present-day coordinates. The arc consists of the western Goonumbla-Trangie Volcanic Belt, replacing the inappropriate term Junee-Narromine Volcanic Belt, and an eastern composite of the Molong, Rockley-Gulgong and Kiandra Volcanic Belts. These two major segments of the arc are separated by Ordovician quartz turbidites of the Kirribilli Formation and it is probable that the arc has been duplicated by a sinistral strike-slip fault. Eastonian palaeogeographic reconstruction of the eastern segment of the arc highlights a prominent limestone platform in the western Molong Volcanic Belt that grades eastwards into a realm of mainly deep-marine sedimentation and volcanic activity. By analogy with Guam in the western Pacific Ocean, the limestone platform is equated to a frontal arc ridge. This implies that the associated subduction zone was along the western side of the arc and not to the east, as in previous reconstructions. A wide zone of deformed Ordovician quartz turbidites, making up the Girilambone and Wagga-Omeo Zones west of the Macquarie Arc, is interpreted as a subduction complex that formed rapidly in the Late Ordovician. Flipping of the subduction zone was a relatively long event, inferred to have occurred during the latest Ordovician to early Silurian Benambran Orogeny. This was driven by collision of the subduction complex with northern continuations of the Stawell and Bendigo Zones, with a new west-dipping subduction zone forming to the east.

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“…Mineralization may have continued at Cadia East until about 437 Ma, as indicated by a U-Pb age determination on zircon from an intermineral dike (Wilson, Cooke, Stein, and others, 2007). Thus, the Cadia Quarry, Cadia Hill, and Cadia East deposits formed during very late stages of phase 4 Macquarie-Arc magmatism (~457-438 Ma, according to Percival and Glen, 2007).…”

Section: Cadia Hill and Cadia Quarry Depositsmentioning

confidence: 99%

“…According to Percival and Glen (2007), Ordovician to Early Silurian igneous rocks of the Kiandra, Junee-Narromine, Molong, and Rockley-Gulgong Volcanic Belts formed during four successive phases of magmatism. Correlation of these phases between volcanic belts supports the conclusion that these four volcanic belts were once contiguous parts of a single Macquarie Arc.…”

Section: Macquarie Arcmentioning

confidence: 99%

Porphyry copper assessment of eastern Australia

Bookstrom¹,

Len²,

Hammarstrom³

et al. 2014

Scientific Investigations Report

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Ordovician to earliest Silurian history of the Macquarie Arc, Lachlan Orogen, New South Wales

Cited by 82 publications

References 54 publications

Different styles of modern and ancient non-collisional orogens and implications for crustal growth: a Gondwanaland perspective

Different styles of modern and ancient non-collisional orogens and implications for crustal growth: a Gondwanaland perspective

Tectonic evolution of the Ordovician Macquarie Arc, central New South Wales: arguments for subduction polarity and anticlockwise rotation

Porphyry copper assessment of eastern Australia

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