Basement Geology of the Beardmore Glacier Region
- Mort D. Turner and
- John E. Splettstoesser
Published Online: 16 MAR 2013
Copyright 1986 by the American Geophysical Union.
Geology of the Central Transantarctic Mountains
How to Cite
Gunner, J. D. (1986) Basement Geology of the Beardmore Glacier Region, in Geology of the Central Transantarctic Mountains (eds M. D. Turner and J. E. Splettstoesser), American Geophysical Union, Washington, D. C.. doi: 10.1029/AR036p0001
- Published Online: 16 MAR 2013
- Published Print: 1 JAN 1986
Print ISBN: 9780875901848
Online ISBN: 9781118664797
- Geology—Antarctic Regions—Beardmore Glacier Region
In the Beardmore Glacier region the basement complex consists of the Nimrod, Beardmore, and Byrd Groups, each predominantly of sedimentary origin, and the Granite Harbour Intrusives. The Nimrod Group is a sequence of shallow water sedimentary rocks and intercalated volcanics. It was regionally metamorphosed to amphibolite facies at least 1000 m.y. ago and was also subjected to polyphase deformation. The Beardmore Group is a sequence of detrital sediments that were deposited in a deep marine basin in the Late Precambrian. This was followed by deposition under shallow water conditions of the Byrd Group sediments, which are partly Cambrian. All three groups were folded in the Lower Paleozoic Ross Orogeny. They were then intruded by numerous granitic plutons, the Granite Harbour Intrusives, which have been dated at between 490 and 450 m.y.