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Journal of the Geological Society; 1995; v. 152; issue.3; p. 417-420;
DOI: 10.1144/gsjgs.152.3.0417
© 1995 Geological Society of London

Article

Early Palaeozoic rather than Neoproterozoic volcanism and rifting within the Transantarctic Mountains

I. L. MILLAR1,2 & B. C. STOREY1

1 British Antarctic Survey, Natural Environmental Research Council, High Cross, Madingley Road, Cambridge CB3 OET, UK
2 British Antarctic Survey, c/o NERC Isotope Geosciences Laboratory, Keyworth, Nottingham NG12 5GG, UK

New U-Pb dating of zircons separated from felsic volcanic rocks of the Patuxent and Gambacorta formations from the Pensacola Mountains in the Transantarctic Mountains, Antarctica, yields earliest Ordovician ages of 500 ± 8 and 501 ± 3 Ma respectively. The dated felsic volcanic rock of the Gorecki Felsite Member of the Patuxent Formation is important tectonically, as the felsite, together with mafic volcanic rocks, were previously considered to provide key evidence of a Neoproterozoic rifting event prior to separation of Laurentia from East Antarctica. The new data do not necessarily refute this event but indicate a previously unrecognized early Ordovician period of bimodal magmatism and extension along the Transantaractic Mountains.

Key Words: Antarctica • Ordovician • volcanism • rifting • U/Pb




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