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U-Pb zircon age of the metavolcanic rocks of Fisher Massif (Prince Charles Mountains, East Antarctica)

Published online by Cambridge University Press:  12 May 2004

B. V. Beliatsky ,
A. A. Laiba  and
E. V. Mikhalsky
B. V. Beliatsky
Affiliation:
VNIIOkeangeologia, St. Maklina 1, St. Petersburg 190121, Russia
A. A. Laiba
Affiliation:
Polar Marine Geological Research Expedition, St. Pobedy 24, Lomonosov, St. Petersburg 189510, Russia
E. V. Mikhalsky
Affiliation:
VNIIOkeangeologia, St. Maklina 1, St. Petersburg 190121, Russia
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Abstract

Fisher Massif is believed to represent less metamorphosed portions of an extensive Proterozoic mobile belt, and is composed of metavolcanic rocks of different compositions and numerous intrusive bodies. U-Pb dating of six zircon fractions recovered from metavolcanic rocks of intermediate to acidic compositions defines growth time at c.1300 Ma with prominent Pb losses at 364 Ma and in recent time. Grain morphologies do not provide unequivocal genetic evidence, but an igneous origin for the grains studied is the most probable. The dates obtained probably reflect igneous activity be co-eval with mafic dyke emplacement event elsewhere in ancient East Antarctic cratonic blocks.

Keywords

Antarcticametavolcanic rocksProterozoicU-Pb zircon ages
Type
Papers—Earth Sciences and Glaciology
Information
Antarctic Science , Volume 6 , Issue 3 , September 1994 , pp. 355 - 358
Copyright
© Antarctic Science Ltd 1994

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