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

Published online by Cambridge University Press:  06 May 2004

C.J. Carson ,
S.D. Boger ,
C.M. Fanning ,
C.J.L. Wilson  and
D.E. Thost
C.J. Carson
Affiliation:
Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA
S.D. Boger
Affiliation:
School of Earth Sciences, University of Melbourne, Parkville, VIC 3052, Australia
C.M. Fanning
Affiliation:
Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia
C.J.L. Wilson
Affiliation:
School of Earth Sciences, University of Melbourne, Parkville, VIC 3052, Australia
D.E. Thost
Affiliation:
Australian Antarctic Division, Kingston, TAS, 7050, Australia
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Abstract

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.

Keywords

Early Palaeozoicearly NeoproterozoicEast Antarcticanorthern Prince Charles MountainsSHRIMP
Type
Papers—Earth Sciences and Glaciology
Information
Antarctic Science , Volume 12 , Issue 4 , December 2000 , pp. 429 - 442
Copyright
© Antarctic Science Ltd 2000

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