Isotopic and geochemical constraints on the age and origin of granitoids from the central Mawson Escarpment, southern Prince Charles Mountains, East Antarctica

Boger, Steven D.; Maas, Roland; Fanning, Christopher

doi:10.1007/s00410-007-0249-x

Cited by 39 publications

(5 citation statements)

References 64 publications

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“…In the Prydz Bay area, geochronological records show multiple events of felsic magmatism (Mikhalsky et al , 2013). In the Lambert Terrane of the northern Prince Charles Mountain – Prydz Bay area, felsic magmatism occurred at c. 2490−2420 Ma and c. 2120−2080 Ma (Boger et al , 2001 2008; Mikhalsky et al , 2006; Corvino et al , 2008). In the Rauer Group area, felsic magmatism occurred at c. 3470−3270 Ma (Kinny et al , 1993; Harley et al , 1998; Kelsey et al , 2003, 2007, 2008).…”

Section: Discussionmentioning

confidence: 99%

Origin of orthopyroxene-bearing felsic gneiss from the perspective of ultrahigh-temperature metamorphism: an example from the Chilka Lake migmatite complex, Eastern Ghats Belt, India

Bose

Das

Torimoto

et al. 2020

MinMag

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Orthopyroxene-bearing felsic gneiss occurs as foliation-parallel layers and bands together with aluminous granulite, mafic granulite, and quartzofeldspathic granulite in the Chilka Lake migmatite complex of the Proterozoic Eastern Ghats Belt, India. The rock was classified previously as charnockite which underwent granulite-facies metamorphism. Field and textural features of this rock show evidence of the partial melting of a biotite-bearing greywacke protolith. Orthopyroxene with/without garnet and cordierite were produced with K-feldspar as peritectic phases of incongruent melting of presumed metaluminous sediments. Fluid-inclusion data suggest the presence of high-density CO2-rich fluids during peak metamorphism, which are similar to those found in associated aluminous granulite. Whole-rock major and trace element data show wide variability of the source materials whereas REE distributions show enriched LREE and flat HREE patterns. Zircon grains from representative samples show the presence of inherited cores having spot dates (SHRIMP) in the range c. 1790–3270 Ma. The overgrowth on zircon was formed predominantly during c. 780–730 Ma and sporadically during c. 550–520 Ma. Some neoblastic zircons with c. 780–730 Ma ages are also present. U-rich dark zones surrounding cores appear partially metamictised, but spot ages from this zone vary within c. 1000–900 Ma. The <1000 Ma ages represent metamorphism that mirrors the events in associated aluminous granulite. The sources of metaluminous sediments are speculative as the rock compositions are largely modified under granulite-facies metamorphism and partial melting. Considering the accretionary tectonic setting of the Eastern Ghats Belt during the c. 1000–900 Ma time frame, a greywacke-type protolith for the migmatite complex has been proposed.

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Section: Discussionmentioning

confidence: 99%

Origin of orthopyroxene-bearing felsic gneiss from the perspective of ultrahigh-temperature metamorphism: an example from the Chilka Lake migmatite complex, Eastern Ghats Belt, India

Bose

Das

Torimoto

et al. 2020

MinMag

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“…The ∼3520 Ma Manning Orthogneiss [ Boger et al , 2008] outcrops along the Manning Glacier. Magnetic susceptibility data are not available for the Manning Orthogneiss.…”

Section: Interpretation Discussionmentioning

confidence: 99%

“…The Lambert Province extends from the central Mawson Escarpment through the central Prince Charles Mountains on the western side of the Lambert Glacier [ Kamenev et al , 1993]. It is composed of intrusive rocks with ages at 3520 Ma, 2480–2420 Ma, 2180–2100 Ma, and 530–490 Ma [ Mikhalsky et al , 2006; Corvino and Henjes‐Kunst , 2007; Boger et al , 2001, 2008] and was deformed between 940 and 900 Ma [ Corvino et al , 2009] and 530–490 Ma [ Boger et al , 2001, 2008].…”

Section: Geological Setting Of the Lambert Rift Regionmentioning

confidence: 99%

Basement interpretations from airborne magnetic and gravity data over the Lambert Rift region of East Antarctica

McLean¹,

Wilson²,

Boger³

et al. 2009

J. Geophys. Res.

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Geological exposures in the Lambert Rift region of East Antarctica comprise scattered coastal outcrops and inland nunataks sporadically protruding through the Antarctic ice sheet from Prydz Bay to the southernmost end of the Prince Charles Mountains. This study utilized airborne magnetic, gravity, and ice radar data to interpret the distribution and architecture of tectonic terranes that are largely buried beneath the thick ice sheet. Free‐air and Bouguer gravity data are highly influenced by the subice and mantle topography, respectively. Gravity stripping facilitated the removal of the effect of ice and Moho, and the residual gravity data set thus obtained for the intermediate crustal level allowed a direct comparison with magnetic data. Interpretation of geophysical data also provided insight into the distribution and geometry of four tectonic blocks: namely, the Vestfold, Beaver, Mawson, and Gamburtsev domains. These tectonic domains are supported by surface observations such as rock descriptions, isotopic data sets, and structural mapping.

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“…Possible Indian Eoarchaean sources that might match the minor w3800 Ma detritus are difficult to find. In the adjacent part of Antarctica, however, protoliths of up to w3800 Ma have been recorded in the Napier Complex (Harley and Black, 1997) and the Ruker Terrane further south has granitoids and orthogneisses with protoliths of up to w3500 Ma (Mikhalsky et al, 2001;Boger et al, 2008). Rare detrital zircons of up to w3500 Ma are also seen in Triassic to Recent sediments and sedimentary rocks of this part of Antarctica Saeed, 2008, 2011).…”

Section: Provenance Of the Pranhita-godavari Valley Proterozoicpalaeomentioning

confidence: 91%

Evolving provenance in the Proterozoic Pranhita-Godavari Basin, India

Amarasinghe

Chaudhuri

Collins

et al. 2015

Geoscience Frontiers

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Isotopic and geochemical constraints on the age and origin of granitoids from the central Mawson Escarpment, southern Prince Charles Mountains, East Antarctica

Cited by 39 publications

References 64 publications

Origin of orthopyroxene-bearing felsic gneiss from the perspective of ultrahigh-temperature metamorphism: an example from the Chilka Lake migmatite complex, Eastern Ghats Belt, India

Origin of orthopyroxene-bearing felsic gneiss from the perspective of ultrahigh-temperature metamorphism: an example from the Chilka Lake migmatite complex, Eastern Ghats Belt, India

Basement interpretations from airborne magnetic and gravity data over the Lambert Rift region of East Antarctica

Evolving provenance in the Proterozoic Pranhita-Godavari Basin, India

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