The Australo-Antarctic Columbia to Gondwana transition

Aitken, Alan; Betts, Peter Graham; Young, D. A.; Blankenship, D. D.; Roberts, Jason L.; Siegert, Martín J.

doi:10.1016/j.gr.2014.10.019

Cited by 105 publications

(86 citation statements)

References 127 publications

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“…Given that at some stage the Mawson Craton must have joined with the West Australian Craton, it is likely that the suture zone, however cryptic, lies somewhere within the Madura and Coompana Provinces. This suture would predate substantial sinistral displacement inferred to have occurred along the Mundrabilla Shear Zone between c. 1140 and 1070 Ma(Smithies et al, 2015b;Aitken et al, 2015).…”

mentioning

confidence: 90%

Transformation of an Archean craton margin during Proterozoic basin formation and magmatism: The Albany–Fraser Orogen, Western Australia

Spaggiari

Kirkland

Smithies

et al. 2015

Precambrian Research

117

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mentioning

confidence: 90%

Transformation of an Archean craton margin during Proterozoic basin formation and magmatism: The Albany–Fraser Orogen, Western Australia

Spaggiari

Kirkland

Smithies

et al. 2015

Precambrian Research

117

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“…Plate tectonic reconstructions (Figure ) indicate that beneath the thick cover of ice, East Antarctica contains rocks with affiliations to Australia, Africa, and India (Aitken, Betts et al, ; Daczko et al, ; Ferraccioli et al, ; Flowerdew et al, ; Mulder et al, ), all of which were adjoined prior to the breakup of Gondwana during the Jurassic (Boger, ). Geochemical and geophysical studies indicate that both the observed heat flow and crustal heat production across these continents is highly variable (Carson et al, ; Cull, ; Hasterok & Gard, ; Jones, ; Nyblade et al, ; Roy & Rao, ).…”

Section: Introductionmentioning

confidence: 99%

Heat Flow in Southern Australia and Connections With East Antarctica

Pollett

Hasterok

Raimondo

et al. 2019

Geochem Geophys Geosyst

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Key Points First heat flow measurements from the Coompana Province, southern Australia, indicate values of 40–70 mW/m2 (57 ± 3 mW/m2 average) A tectonically reconstructed heat flow map constrains the thermal regime of geological provinces formerly contiguous with East Antarctica Geophysical models of Antarctic heat flow are likely underestimating crustal sources of radiogenic heat that influence subglacial melting

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“…Geophysical interpretations have suggested that the basement geology in the Windmill Islands region correlates to the Nornalup Zone in the eastern Albany–Fraser Orogen (Figures and ; Aitken et al., , ). The metasedimentary rocks of the Windmill Islands have similar depositional ages to the youngest metasedimentary rocks of the c .…”

Section: Discussionmentioning

confidence: 99%

A curious case of agreement between conventional thermobarometry and phase equilibria modelling in granulites: New constraints on P–T estimates in the Antarctica segment of the Musgrave–Albany–Fraser–Wilkes Orogen

Morrissey

Hand

Kelsey

2017

Journal Metamorphic Geology

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The Windmill Islands region in Wilkes Land, east Antarctica, preserves granulite facies metamorphic mineral assemblages that yield seemingly comparable P–T estimates from conventional thermobarometry and mineral equilibria modelling. This is uncommon in granulite facies terranes, where conventional thermobarometry and phase equilibria modelling generally produce conflicting P–T estimates because peak mineral compositions tend to be modified by retrograde diffusion processes. In situ U–Pb monazite geochronology and calculated metamorphic phase diagrams show that the Windmill Islands experienced two phases of high thermal gradient metamorphism during the Mesoproterozoic. The first phase of metamorphism is recorded by monazite ages in two widely separated samples and occurred at c. 1,305 Ma. This event was regional in extent, involved crustally derived magmatism and reached conditions of ~3.2–5 kbar and 690–770°C corresponding to very high thermal gradients of >150°C/kbar. The elevated thermal regime is interpreted to reflect a period of extension or increased extension in a back‐arc setting that existed prior to c. 1,330 Ma. The first metamorphic event was overprinted by granulite facies metamorphism at c. 1,180 Ma that was coeval with the intrusion of charnockite. This event involved peak temperatures of ~840–850°C and pressures of ~4–5 kbar. A phase of granitic magmatism at c. 1,250–1,210 Ma, prior to the intrusion of the charnockite, is interpreted to reflect a phase of compression within an overall back‐arc setting. Existing conventional thermobarometry suggests conditions of ~4 kbar and 750°C for M1 and 4–7 kbar and 750–900°C for M2. The apparent similarities between the phase equilibria modelling and existing conventional thermobarometry may suggest either that the terrane cooled relatively quickly, or that the P–T ranges obtained from conventional thermobarometry are sufficiently imprecise that they cover the range of P–T conditions obtained in this study. However, without phase equilibria modelling, the veracity of existing conventional P–T estimates cannot be evaluated. The calculated phase diagrams from this study allow the direct comparison of P–T conditions in the Windmill Islands with phase equilibria models from other regions in the Musgrave–Albany–Fraser–Wilkes Orogen. This shows that the metamorphic evolution of the Wilkes Land region is very similar to that of the eastern Albany–Fraser Orogen and Musgrave Province in Australia, and further demonstrates the remarkable consistency in the timing of metamorphism and the thermal gradients along the ~5,000 km strike length of this system.

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The Australo-Antarctic Columbia to Gondwana transition

Cited by 105 publications

References 127 publications

Transformation of an Archean craton margin during Proterozoic basin formation and magmatism: The Albany–Fraser Orogen, Western Australia

Transformation of an Archean craton margin during Proterozoic basin formation and magmatism: The Albany–Fraser Orogen, Western Australia

Heat Flow in Southern Australia and Connections With East Antarctica

A curious case of agreement between conventional thermobarometry and phase equilibria modelling in granulites: New constraints on P–T estimates in the Antarctica segment of the Musgrave–Albany–Fraser–Wilkes Orogen

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