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Geology and geochronology of McMurdo Volcanic Group rocks in the vicinity of Lake Morning, McMurdo Sound, Antarctica

Published online by Cambridge University Press:  14 May 2004

Philip R. Kyle  and
H. Lee Muncy
Philip R. Kyle
Affiliation:
Department of Geoscience, New Mexico Institute of Mining and Technology, Socorro, NM87801, USA
H. Lee Muncy
Affiliation:
Department of Geology and Mineralogy, Ohio State University, Columbus, OH43210, USA
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Abstract

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Trachyandesite lava flows and trachytic dykes exposed at ‘Gandalf Ridge’ and near Lake Morning on the northern slopes of Mount Morning represent the oldest exposed volcanic rocks in the Erebus volcanic province of the McMurdo Volcanic Group. Conventional whole rock K-Ar age determinations show the rocks are mid-Miocene, ranging between 14.6 and 18.7 Ma. North–south trending faults, which parallel the Transantarctic Mountains, cut the dated dykes. The faults are probably part of a broad fault zone which bounds the uplifted Transantarctic Mountains and the down-dropped Ross Sea/Ross Ice Shelf embayment.

Keywords

Erebus volcanic provinceK-Ar ageslate Cenozoicundersaturated alkali volcanic rocks.
Type
Papers—Earth Sciences and Glaciology
Information
Antarctic Science , Volume 1 , Issue 4 , December 1989 , pp. 345 - 350
Copyright
© Antarctic Science Ltd 1989