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

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 r...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Kyle, Philip R., Muncy, H. Lee
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 1989
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
Ross Sea
McMurdo Sound
Ross Ice Shelf
Transantarctic Mountains
Mount Morning
Gandalf Ridge
Lake Morning
Antarc*
Antarctic Science
Antarctica
Ice Shelf
Online Access:http://dx.doi.org/10.1017/s0954102089000520
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102089000520
Description
Summary: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.

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