Deciphering early Neoproterozoic and Cambrian high-grade metamorphic events in the Archean/Mesoproterozoic Rauer Group, East Antarctica

2021 ◽  
Vol 365 ◽  
pp. 106392
Author(s):  
Xiaochun Liu ◽  
Longyao Chen ◽  
Wei-RZ Wang ◽  
Yue Zhao ◽  
Xiaoxiao Ling ◽  
...  
Keyword(s):  
East Antarctica ◽  
High Grade ◽  
Early Neoproterozoic

SHRIMP U–Pb geochronology from Mount Kirkby, northern Prince Charles Mountains, East Antarctica

2000 ◽  
Vol 12 (4) ◽  
pp. 429-442 ◽  
Author(s):  
C.J. Carson ◽  
S.D. Boger ◽  
C.M. Fanning ◽  
C.J.L. Wilson ◽  
D.E. Thost
Keyword(s):  
High Resolution ◽  
Local Development ◽  
Conclusive Evidence ◽  
East Antarctica ◽  
High Grade ◽  
Ion Microprobe ◽  
Zircon Dating ◽  
Early Palaeozoic ◽  
Intrusive Activity ◽  
Early Neoproterozoic

Sensitive High Resolution Ion MicroProbe (SHRIMP) U–Pb zircon dating of pegmatites from Mount Kirkby, northern Prince Charles Mountains, east Antarctica indicates felsic intrusive activity at 991 ± 22 Ma and 910 ± 18 Ma. Pegmatite emplacement occurred during prolonged high-grade early Neoproterozoic tectonism. These ages correlate well with previously published U–Pb zircon ages obtained from felsic intrusive bodies elsewhere within the northern Prince Charles Mountains. Early Palaeozoic activity at Mount Kirkby is restricted to the emplacement of minor planar pegmatites at 517 ± 12 Ma, which provide a maximum age for local development of discrete extensional mylonites. No conclusive evidence of tectonic or metamorphic events at c. 800 Ma and c. 500 Ma, which have been recently postulated for the region, can be identified from the presently available U–Pb zircon data.

Early Neoproterozoic metagabbro-tonalite-trondhjemite of Sør Rondane (East Antarctica): Implications for supercontinent assembly

2015 ◽  
Vol 259 ◽  
pp. 189-206 ◽  
Author(s):  
Marlina Elburg ◽  
Joachim Jacobs ◽  
Tom Andersen ◽  
Chris Clark ◽  
Andreas Läufer ◽  
...  
Keyword(s):  
East Antarctica ◽  
Early Neoproterozoic

New U-Pb zircon ages from the Denman Glacier area, East Antarctica, and their significance for Gondwana reconstruction

1992 ◽  
Vol 4 (4) ◽  
pp. 447-460 ◽  
Author(s):  
Lance P. Black ◽  
John W. Sheraton ◽  
Robert J. Tingey ◽  
Malcolm T. Mcculloch
Keyword(s):  
Western Australia ◽  
East Antarctica ◽  
Mobile Belt ◽  
High Grade ◽  
Glacier Area ◽  
Geological History ◽  
Entire Region ◽  
Grade Metamorphism ◽  
High Grade Metamorphism ◽  
Indirect Relationship

Two new U-Pb zircon ages from the area immediately west of Denman Glacier in Antarctica show that its geological history differs from that of the Obruchev Hills and Bunger Hills, to the east of the glacier. A crystallization age of 516.0 ± 1.5 Ma for syenite is by far the youngest primary age reported for this region, whereas tonalitic orthogneiss from Cape Charcot, the oldest known local rock, was derived by the high-grade metamorphism and deformation at 2889 ± 9 Ma of a 3003 ± 8 Ma igneous precursor. Both major populations of zircon in this rock lost Pb at 500–600 Ma. Although the Sm-Nd characteristics of the entire region resemble those of the Albany Mobile Belt of Western Australia, the Sm-Nd systematics of the felsic gneisses and plutonics are too old to allow direct correlation with the rocks of the Naturaliste Block (Western Australia), a potential key element for Gondwana reconstruction. However, the possibility exists that there is an indirect relationship between the Naturaliste Block and the region immediately west of Denman Glacier.

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