Superimposed tectonic events at 2450 Ma, 2100 Ma, 900 Ma and 500 Ma in the North Mawson Escarpment, Antarctic Prince Charles Mountains

Corvino, Adrian F.; Boger, Steven D.; Henjes‐Kunst, Friedhelm; Wilson, Christopher J.L.; Fitzsimons, I. C. W.

doi:10.1016/j.precamres.2008.09.001

Cited by 59 publications

(23 citation statements)

References 85 publications

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“…Outcrops further west in MacRobertson Land and the northern Prince Charles Mountains belong to the c. 1.0 Ga Rayner Complex with only localized evidence for the 0.5 Ga event Boger et al 2000Boger et al , 2002Carson et al 2000), and so appear to mark a western limit for Pan-African tectonism. However, Pan-African metamorphism and deformation was found to extend south of Prydz Bay along the eastern edge of the Amery Ice Shelf (Liu et al 2009b), and inland to the Grove Mountains (Mikhalsky et al 2001;Liu et al 2006Liu et al , 2007 and southern Prince Charles Mountains in the Lambert Graben (Boger et al 2001Corvino et al 2005Corvino et al , 2008.…”

Section: Antarctica Dividedmentioning

confidence: 99%

Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues

Harley

Fitzsimons

Zhao

2013

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The Antarctic rock record spans some 3.5 billion years of history, and has made important contributions to our understanding of how Earth's continents assemble and disperse through time. Correlations between Antarctica and other southern continents were critical to the concept of Gondwana, the Palaeozoic supercontinent used to support early arguments for continental drift, while evidence for Proterozoic connections between Antarctica and North America led to the 'SWEAT' configuration (linking SW USA to East Antarctica) for an early Neoproterozoic supercontinent known as Rodinia. Antarctica also contains relicts of an older Palaeo-to Mesoproterozoic supercontinent known as Nuna, along with several Archaean fragments that belonged to one or more 'supercratons' in Neoarchaean times. It thus seems likely that Antarctica contains remnants of most, if not all, of Earth's supercontinents, and Antarctic research continues to provide insights into their palaeogeography and geological evolution. One area of research is the latest Neoproterozoic-Mesozoic active margin of Gondwana, preserved in Antarctica as the Ross Orogen and a number of outboard terranes that now form West Antarctica. Major episodes of magmatism, deformation and metamorphism along this palaeo-Pacific margin at 590 -500 and 300-230 Ma can be linked to reduced convergence along the internal collisional orogens that formed Gondwana and Pangaea, respectively; indicating that accretionary systems are sensitive to changes in the global plate tectonic budget. Other research has focused on Grenville-age (c. 1.0 Ga) and PanAfrican (c. 0.5 Ga) metamorphism in the East Antarctic Craton. These global-scale events record the amalgamation of Rodinia and Gondwana, respectively. Three coastal segments of Grenville-age metamorphism in the Indian Ocean sector of Antarctica are each linked to the c. 1.0 Ga collision between older cratons but are separated by two regions of pervasive Pan-African metamorphism ascribed to Neoproterozoic ocean closure. The tectonic setting of these events is poorly constrained given the sparse exposure, deep erosion level and likelihood that younger metamorphic events have reactivated older structures. The projection of these orogens under the ice is also controversial, but it is likely that at least one of the Pan-African orogens links up with the Shackleton Range on the palaeo-Pacific margin of the craton. Sedimentary detritus and glacial erratics at the edge of the ice sheet provide evidence for the c.

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Section: Antarctica Dividedmentioning

confidence: 99%

Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues

Harley

Fitzsimons

Zhao

2013

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“…Archaean granite gneisses, Manning Gneiss, have a tonalite-trondhjemitic composition and an emplacement age of 3519 ± 20 Ma . Volumetrically dominant granodioritic-granite gneisses developed by the intrusion of protoliths, which have SHRIMP U-Pb zircon ages of 2423 ± 18 Ma (Mikhalsky et al 2006) and 2474 ± 11 Ma (Corvino and Henzjes-Kunst 2007), and mean Pb-Pb age of 2445 ± 9 Ma (Corvino et al 2008). The Sm-Nd data indicate two episodes of crust formation in the Lambert Terrane: 3600-3800 Ma and 2600-2900 Ma (Mikhalsky et al 2010).…”

Section: S Mohantymentioning

confidence: 94%

“…The Archaean granite gneisses show polyphase deformation and metamorphism. Leucogranites intruding along the axial planes of latephase upright folds indicate the intrusion age to be 905 ± 9 Ma (Corvino et al 2008). The peak metamorphic P-T condition is reported to be~6.8 kbar and 790-810°C (Phillips et al 2009).…”

Section: S Mohantymentioning

confidence: 97%

“…Felsic orthogneisses (mostly of Palaeoproterozoic and Neoproterozoic age), metasediments, mafic to felsic calcalkaline metavolcanics, syn-tectonic tonalities, and late tectonic orthopyroxene-bearing granitoids (charnockites) constitute the major components of Mac Robertson Land. The distribution of Nd isotope depleted mantle model age in the nPCM indicates older protolith ages in the west (2100( -1900 and younger ages (1700-1600 Ma) to the east (Zhao et al 1997). The metasedimentary sequence of the nPCM indicates that a basin of deposition existed between 1440 and 1020 Ma (Boger et al 2012).…”

Section: The Rayner Complexmentioning

confidence: 99%

“…The rims of the zircon grains from the Philpot gneiss have upper and lower discordia ages of 1635 ± 15 Ma and 560 ± 17 Ma . The augen gneisses have a U-Pb zircon age of 2152 ± 10 Ma (Corvino et al 2008). The Archaean granite gneisses show polyphase deformation and metamorphism.…”

Section: S Mohantymentioning

confidence: 99%

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Precambrian continent assembly and dispersal events of South Indian and East Antarctic Shields

Mohanty

2015

International Geology Review

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An Archaean continent 'SIWA', an acronym for South India-Western Australia, comprising the Bastar-Dharwar craton, the Yilgarn craton, the Napier Complex, and the Vestfold Hills has been identified from palaeomagnetic and spatio-temporal data. This assembly was dispersed in three phases with the development of the proto-Indian ocean. The first and second events~2350 and~2000 Ma were related to the separation of the Yilgarn craton and the Napier Complex, respectively, to form a proto-Indo-Antarctic ocean and the Cuddapah basin. The proto-ocean was closed~1650 Ma by the collision of the Lambert Terrane of East Antarctica and the Bastar-Dharwar craton. This collision, associated with ultra-high temperature (UHT) granulite facies metamorphism, is identified in the southern domain of the Eastern Ghats and the Oygardens domain of East Antarctica. The third extensional event between 1500 and 1200 Ma was associated with the separation of the Vestfold Hills block and a second phase of opening of the proto-Indian ocean, and the development of a series of basins on the western side of the Eastern Ghats (the Chhatisgarh, Khariar, Ampani, Indravati, and Sabari basins). The closing of this ocean basin during the Eastern Ghats-Rayner orogeny at~950 Ma was related to the amalgamation of India and East Antarctica to form the supercontinent Rodinia. During the Neoproterozoic, this part of Rodinia was involved in orogenic collapse/extension and deposition of the Sodruzhesvo Group. The Pan-African Prydz Bay orogeny at~550 Ma caused the closing of the basin to form East Gondwanaland.

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Sea surface temperature control on the distribution of far-traveled Southern Ocean ice-rafted detritus during the Pliocene

et al. 2014

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The flux and provenance of ice-rafted detritus (IRD) deposited in the Southern Ocean can reveal information about the past instability of Antarctica's ice sheets during different climatic conditions. Here we present a Pliocene IRD provenance record based on the 40 Ar/ 39Ar ages of ice-rafted hornblende grains from Ocean Drilling Program Site 1165, located near Prydz Bay in the Indian Ocean sector of the Southern Ocean, along with the results of modeled sensitivity tests of iceberg trajectories and their spatial melting patterns under a range of sea surface temperatures (SSTs). Our provenance results reveal that IRD and hence icebergs in the Prydz Bay area were mainly sourced from (i) the local Prydz Bay region and (ii) the remote Wilkes Land margin located at the mouth of the low-lying Aurora Subglacial Basin. A series of IRD pulses, reaching up to 10 times background IRD flux levels, were previously identified at Site 1165 between 3.3 and 3.0 Ma. Our new results reveal that the average proportion of IRD sourced from distal Wilkes Land margin doubles after 3.3 Ma. Our iceberg trajectory-melting models show that slower iceberg melting under cooling SSTs over this middle Pliocene interval allowed Wilkes Land icebergs to travel farther before melting. Hence, declining SSTs can account for a large part of the observed IRD provenance record at Site 1165. In early Pliocene IRD layers, sampled at suborbital resolution around 4.6 Ma, we find evidence for significant increases in icebergs derived from Wilkes Land during very warm interglacials. This is suggestive of large-scale destabilization of the East Antarctic Ice Sheet in the Aurora Subglacial Basin, as far-traveled icebergs would have to overcome enhanced melting in warmer SSTs. Our results highlight the importance of considering SSTs when interpreting IRD flux and provenance records in distal locations.

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Superimposed tectonic events at 2450 Ma, 2100 Ma, 900 Ma and 500 Ma in the North Mawson Escarpment, Antarctic Prince Charles Mountains

Cited by 59 publications

References 85 publications

Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues

Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues

Precambrian continent assembly and dispersal events of South Indian and East Antarctic Shields

Sea surface temperature control on the distribution of far-traveled Southern Ocean ice-rafted detritus during the Pliocene

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