Two distinct Precambrian terranes in the Southern Prince Charles Mountains, East Antarctica: SHRIMP dating and geochemical constraints

Mikhalsky, E. V.; Beliatsky, B. V.; Sheraton, J. W.; Roland, Norbert W

doi:10.1016/j.gr.2005.10.002

Cited by 60 publications

(21 citation statements)

References 21 publications

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“…Furthermore, it was recognized that a large section of the Maud Belt was reworked by late Neoproterozoic metamorphism and deformation that could be correlated with the extensive East African Orogen, produced by the amalgamation of East and West Gondwana (Jacobs et al 2003a). Recognition of unrelated pre-Rodinian cratons in East Antarctica was also achieved, with the correlation of the Mawson continent and the Gawler Craton in South Australia (Fanning et al 1996), and the geochronological characterization of Archaean terranes south of a c. 550 Ma suture zone in the southern Prince Charles Mountains adjacent to Prydz Bay (Boger et al 2001;Mikhalsky et al 2001Mikhalsky et al , 2006Phillips et al 2006).…”

Section: East Antarctica: An Integral Part Of Gondwanamentioning

confidence: 99%

Geosciences research in East Antarctica (0°E–60°E): present status and future perspectives

Satish-Kumar

Hokada

Kawakami

et al. 2008

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In both palaeoenvironmental and palaeogeographical studies, Antarctica plays a unique role in our understanding of the history of the Earth. It has maintained a unique geographical position at the South Pole for long periods. As the only unpopulated continent, the absence of political barriers or short-term economic interests has allowed international collaborative science to flourish. Although 98% of its area is covered by ice, the coastal Antarctic region is one of the wellstudied regions in the world. The integrity and success of geological studies lies in the fact that exposed outcrops are well preserved in the low-latitude climate. The continuing programme of the Japanese Antarctic Research Expedition focuses on the geology of East Antarctica, especially in the Dronning Maud Land and Enderby Land regions. Enderby Land preserves some of the oldest Archaean rocks on Earth, and the Mesoproterozoic to Palaeozoic history of Dronning Maud Land is extremely important in understanding the formation and dispersion of Rodinia and subsequent assembly of Gondwana. The geological features in this region have great significance in defining the temporal and spatial extension of orogenic belts formed by the collision of proto-continents. Present understanding of the evolution of East Antarctica in terms of global tectonics allows us to visualize how continents have evolved through time and space, and how far back in time the present-day plate-tectonic regime may have operated. Although several fundamental research problems still need to be resolved, the future direction of geoscience research in Antarctica will focus on how the formation and evolution of continents and supercontinents have affected the Earth's environment, a question that has been addressed only in recent years.

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Section: East Antarctica: An Integral Part Of Gondwanamentioning

confidence: 99%

Geosciences research in East Antarctica (0°E–60°E): present status and future perspectives

Satish-Kumar

Hokada

Kawakami

et al. 2008

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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: 95%

“…Several Pb-Pb, U-Pb, and SmNd isotope studies have indicated a major tectonothermal event in the Rayner domain at~1750-1550 Ma (cf. 1756 ± 40 Pb-Pb rim age of Mikhalsky et al 2006; 1650-1500 and 1400-1250 Ma ages of Halpin et al 2007), prior to the Rayner orogeny. A cluster of Pb-Pb age data at 2350-1950 Ma for the detrital core of monazite has been identified as the maximum age of sedimentation of the protolith ).…”

Section: The Rayner Complexmentioning

confidence: 97%

“…The Ruker Province of sPCM comprises two juxtaposed blocks: the Ruker Terrane and the Lambert Terrane (Kamenev et al 1993;Boger et al 2001;Mikhalsky et al 2006). The Archaean tonalitic-trondhjemitic gneisses forming the~3500 Ma Mawson Suite are the oldest recognizable units of the Ruker Terrane (Boger et al 2006;Mikhalsky et al 2006Mikhalsky et al , 2010.…”

Section: The Ruker Provincementioning

confidence: 99%

“…The Archaean tonalitic-trondhjemitic gneisses forming the~3500 Ma Mawson Suite are the oldest recognizable units of the Ruker Terrane (Boger et al 2006;Mikhalsky et al 2006Mikhalsky et al , 2010. The xenocrystic zircons from these orthogneisses indicate the age of these gneisses to be~3170 Ma (weighted mean Pb-Pb age of 3177 ± 6 Ma, Boger et al 2006), and the model ages range from 3900 to 3400 Ma (Mikhalsky et al 2006). These gneisses are interleaved with an Archaean suite of pelites and carbonate sediments (the Menzies Group) and intrusives.…”

Section: The Ruker Provincementioning

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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Tectonic Subdivision of the Prince Charles Mountains: A Review of Geologic and Isotopic Data

Mikhalsky

Laiba²,

Beliatsky³

Antarctica

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Abstract. The Prince Charles Mountains have been subject to extensive geological and geophysical investigations by former Soviet,Russian and Australian scientists from the early 1970s. In this paper we summarise, and review available geological and isotopic data, and report results of new isotopic studies (SmNd, Pb-Pb, and U-Pb SHRIMP analyses); field geological data obtained during the PCMEGA 2002/2003 are utilised. The structure of the region is described in terms of four tectonic terranes. Those include Archaean Ruker, Palaeoproterozoic Lambert, Mesoproterozoic Fisher, and Meso-to Neoproterozoic Beaver Terranes. Pan-African activities (granite emplacement and probably tectonics) in the Lambert Terrane are reported. We present a summary of the composition of these terranes, discuss their origin and relationships. We also outline the most striking geological features, and problems, and try to draw attention to those rocks and regional geological features which are important in understanding the composition and evolution of the PCM and might suggest targets for further investigations. Previous WorkThe Prince Charles Mountains (PCM) constitute by far the best exposed cross section through the East Antarctic Shield, extending for over 500 km along the drainage basin of the Lambert Glacier -Amery Ice Shelf system (Fig. 2.7-1). Australian geologists first visited this region between 1955 and 1957. The results of geological observations were presented by Stinear (1956) and Crohn (1959), who recorded in the northern PCM (NPCM) a range of high-grade metamorphic rocks of both sedimentary and igneous origin, as well as orthopyroxene granitoids, and an overlying coal-bearing Permian-Triassic sedimentary sequence. Geological investigations in the southern PCM (SPCM) showed that the rocks there are generally of much lower metamorphic grade (green-schist to amphibolite facies) than those of the NPCM; they include thick metasedimentary sequences and are cut by abundant mafic dykes. The early workers (Tingey 1982(Tingey , 1991, and references therein), on the basis of numerous Rb-Sr ages, reported the PCM as comprising two major tectonic provinces roughly corresponding to the two parts of the mountain range (NPCM and SPCM). One of the most interesting results of this study (Tingey 1982(Tingey , 1991 was the recognition that presumed granitic basement and overlying metasediments in the SPCM were of Archaean age (whole-rock Rb-Sr isochrons 2 700 ±90, 2 750 ±400, and 2 760 ±200 Ma), whereas granulite-facies rocks of the NPCM were Meso-to Neoproterozoic (whole-rock Rb-Sr isochrons from 769 ±36 to 1033 ±85 Ma). This was at variance with earlier ideas that the higher-grade rocks were likely to be older (e.g., Solov ev 1972). Muscovite-bearing pegmatites cutting the metasediments in the SPCM were dated at 2 589, 2 100, 1 995, and 1 708 Ma, and it was suggested that Palaeoproterozoic, as well as Archaean sequences may be present. A few imprecise Mesoproterozoic isochron ages were also obtained (ca. 1 170 ±230, 1 400 ±150 Ma); these w...

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Two distinct Precambrian terranes in the Southern Prince Charles Mountains, East Antarctica: SHRIMP dating and geochemical constraints

Cited by 60 publications

References 21 publications

Geosciences research in East Antarctica (0°E–60°E): present status and future perspectives

Geosciences research in East Antarctica (0°E–60°E): present status and future perspectives

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

Tectonic Subdivision of the Prince Charles Mountains: A Review of Geologic and Isotopic Data

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