One billion years of tectonism at the Paleoproterozoic interface of North and South Australia

Morrissey, Laura J.; Payne, Justin L.; Hand, Martin; Clark, Chris; Janicki, Matthew

doi:10.1016/j.precamres.2023.107077

Cited by 4 publications

(5 citation statements)

References 99 publications

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“…The ca . 1730–1700 Ma monazite and garnet ages correspond to the Kimban Orogeny, which variably affected most of the Gawler Craton (Hand et al, 2007; Morrissey et al, 2023; Payne et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…Due to the uncertainties in the palaeogeography of Gawler Craton, the drivers for early Mesoproterozoic extension are unclear. However, there is a general consensus the southern Australia Palaeo‐Mesoproterozoic rock system was formerly continuous with the North Australian Craton (Betts et al, 2016; Cawood & Korsch, 2008; Morrissey et al, 2023; Payne et al, 2009). Within this configuration, the proto‐cratonic crust of the northern Gawler Craton is envisaged to have been sandwiched between two subduction systems (Figure 13).…”

Section: Discussionmentioning

confidence: 99%

“…The ca. 1600-1540 Ma Kararan Orogeny was broadly coeval with magmatism and involved deformation and high thermal gradient metamorphism in the northern, western and southeastern Gawler Craton (Bockmann et al, 2022;Cutts et al, 2011;Daly, 1998;Forbes et al, 2011;Hand et al, 2007;Morrissey et al, 2013Morrissey et al, , 2023Payne et al, 2008;Reid et al, 2019;Tiddy et al, 2020). Ca.…”

Section: Gawler Cratonmentioning

confidence: 99%

“…1520 Ma metamorphism may be related to the newly identified ca. 1500-1480 Ma highgrade metamorphism along the Karari Shear Zone in the northern Gawler Craton (Figure 1; Morrissey et al, 2023;Yu et al, 2024).…”

Section: Age Constraints On Metamorphism In Mabel Creek Ridge and Its...mentioning

confidence: 99%

“…The craton‐wide Kimban Orogeny ( ca . 1730–1690 Ma) terminated widespread basin development and sedimentation, with activation of crustal‐scale shear zones, granitic magmatism, widespread metamorphism and localized basin development (Dutch et al, 2010; Hand et al, 2007; Morrissey et al, 2023; Payne et al, 2008; Reid et al, 2019). Following the Kimban Orogeny, the Gawler Craton experienced a series of dominantly magmatic events.…”

Section: Geological Settingmentioning

confidence: 99%

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A buried gneiss dome in the northern Gawler Craton: The record of early Mesoproterozoic (ca. 1600–1560 Ma) extension in southern Proterozoic Australia

Yu,

Hand,

Morrissey

et al. 2024

Journal Metamorphic Geology

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Mabel Creek Ridge, in the northern Gawler Craton, is a granulite‐facies domain recording early Mesoproterozoic metamorphism, flanked by less metamorphosed rocks and dissected by crustal‐scale divergent structures. The nature of early Mesoproterozoic events is poorly understood due to the lack of basement outcrop. Calculated metamorphic phase diagrams and geochronology are used to decipher the tectonic regime of a potential gneiss dome. Pressure–temperature (P–T) modelling of metapelites from five drill holes across Mabel Creek Ridge suggests it has experienced conditions of ~6.4–7.4 kbar and 800–850°C and the growth of suprasolidus cordierite after garnet indicates subsequent decompression. In situ U–Pb monazite and Lu–Hf garnet geochronology constrains the granulite‐facies metamorphism of Mabel Creek Ridge to ca. 1600–1560 Ma. In contrast, drill hole GOMA DH4 located to the north of Mabel Creek Ridge records conditions of 2.2–5.4 kbar and 710–740°C at ca. 1520 Ma, with no evidence for 1600–1560 Ma metamorphism. Our new P–T pseudosection results and geochronology data from Mabel Creek Ridge and adjacent crust, coupled with the regional seismic and airborne magnetic data, reveal that Mabel Creek Ridge represents a record of early Mesoproterozoic extension in the Gawler Craton, during which thermally perturbed lower crustal rocks were exhumed within a gneiss dome. Early Mesoproterozoic extension took place within a complex geodynamic regime resulting from the interplay between final Nuna convergence along the margin of northeast Australia at ca. 1600 Ma and subduction to the southwest at ca. 1630–1610 Ma.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Gawler Cratonmentioning

confidence: 99%

Section: Age Constraints On Metamorphism In Mabel Creek Ridge and Its...mentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

See 3 more Smart Citations

A buried gneiss dome in the northern Gawler Craton: The record of early Mesoproterozoic (ca. 1600–1560 Ma) extension in southern Proterozoic Australia

Yu,

Hand,

Morrissey

et al. 2024

Journal Metamorphic Geology

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Innovation in apatite Lu-Hf geochronology opens new opportunity for copper systems in southern Australia during the Nuna destruction

Yu,

Hand,

Payne

et al. 2024

Miner Deposita

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Precambrian iron oxide copper-gold (IOCG) systems have commonly experienced multiple mineralising and tectonothermal events and identifying their timing and geodynamic framework is challenging. World-class IOCG deposits in the Olympic Cu-Au Province, South Australia, are dominated by hematite and formed in the upper crust, while the magnetite-dominated Cu deposits hosted in granulite facies rocks are considered to represent the deeper expression of giant IOCG system. However, the application of novel in-situ Lu-Hf apatite geochronology reveals the magnetite-hosted Cu mineralisation is significantly younger and unrelated to the well-known ~ 1590 Ma Gawler Craton IOCG systems. Apatite Lu-Hf ages from the granulite that predates Cu mineralisation give ages of 1490 Ma. Infiltration of Cu-bearing fluids resulted in recrystallisation of apatite, LREE mobilisation and formation of secondary monazite. Lu-Hf ages for syn-mineralisation apatite give 1460 Ma, consistent with c. 1460 Ma U-Pb ages from secondary monazite. In contrast to the apatite in situ Lu-Hf ages, all apatite types produce a single U-Pb age of c. 1460 Ma, demonstrating the ability of Lu-Hf to preserve a more complete history of apatite formation than U-Pb in high- to medium-temperature rock systems. The timing of mineralisation coincides with the onset of Nuna fragmentation, representing a previously unrecognised driver for mineral system formation in southern Australia that installed Cu in crust previously dehydrated during a long history of granulite-grade tectonic events. The recognition of this Cu system in rocks generally considered unprospective shows that continental breakup can rejuvenate metallic systems in otherwise unprospective crust.

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Earth’s tectonic and plate boundary evolution over 1.8 billion years

Cao,

Collins,

Pisarevsky

et al. 2024

Geoscience Frontiers

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One billion years of tectonism at the Paleoproterozoic interface of North and South Australia

Cited by 4 publications

References 99 publications

A buried gneiss dome in the northern Gawler Craton: The record of early Mesoproterozoic (ca. 1600–1560 Ma) extension in southern Proterozoic Australia

A buried gneiss dome in the northern Gawler Craton: The record of early Mesoproterozoic (ca. 1600–1560 Ma) extension in southern Proterozoic Australia

Innovation in apatite Lu-Hf geochronology opens new opportunity for copper systems in southern Australia during the Nuna destruction

Earth’s tectonic and plate boundary evolution over 1.8 billion years

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