The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica
The petrography and structure of three small areas, the Nussbaum Riegel and the north and south sides of the Garwood Valley in the "Dry Valleys" region of Victoria Land, Antarctica, are described and discussed. The rocks are mostly pure or impure marbles plus lesser quantities of amphiboli...
Published in: | Journal of the Geological Society of Australia |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/ebbaeb17-eb5f-4753-afb9-b2091313370d 2023-05-15T13:51:16+02:00 The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica Williams, P. F. Hobbs, B. E. Vernon, R. H. Anderson, D. E. 1971 https://researchers.mq.edu.au/en/publications/ebbaeb17-eb5f-4753-afb9-b2091313370d https://doi.org/10.1080/00167617108728751 http://www.scopus.com/inward/record.url?scp=0000015422&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Williams , P F , Hobbs , B E , Vernon , R H & Anderson , D E 1971 , ' The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica ' , Journal of the Geological Society of Australia , vol. 18 , no. 2 , pp. 127-142 . https://doi.org/10.1080/00167617108728751 article 1971 ftmacquarieunicr https://doi.org/10.1080/00167617108728751 2022-02-18T14:38:28Z The petrography and structure of three small areas, the Nussbaum Riegel and the north and south sides of the Garwood Valley in the "Dry Valleys" region of Victoria Land, Antarctica, are described and discussed. The rocks are mostly pure or impure marbles plus lesser quantities of amphibolite, schist and quartz-feldspar rocks, and mineral assemblages indicate that they have been metamorphosed under conditions of the amphibolite fades, and possibly, locally under conditions transitional to the granulite facies. In general they have not suffered retrograde metamorphism. Nussbaum Riegel is characterized by isoclinal folds and very well-developed boudinage structure. Examination of the boudins reveals that the competent beds behaved in a ductile manner when failing parallel to the fold axis and in a brittle manner when failing perpendicular to the fold axis. An explanation for this observation is offered, based on variation in strain rate in various directions during the development of the fold. The Garwood Valley areas are complex and two generations of folds are recognized. The large scale structure of the south side of the Garwood Valley is interpreted as a tight basin resulting from the interference of the two generations of folds. The large scale structure of the north side of the Garwood Valley is believed to be similar in style to that of the south side, but insufficient data are obtainable to allow detailed interpretation. Copyright. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal McMurdo Sound Victoria Land Macquarie University Research Portal Victoria Land McMurdo Sound Garwood ENVELOPE(164.283,164.283,-78.033,-78.033) Garwood Valley ENVELOPE(164.167,164.167,-78.033,-78.033) Nussbaum Riegel ENVELOPE(162.767,162.767,-77.667,-77.667) Journal of the Geological Society of Australia 18 2 127 142 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
description |
The petrography and structure of three small areas, the Nussbaum Riegel and the north and south sides of the Garwood Valley in the "Dry Valleys" region of Victoria Land, Antarctica, are described and discussed. The rocks are mostly pure or impure marbles plus lesser quantities of amphibolite, schist and quartz-feldspar rocks, and mineral assemblages indicate that they have been metamorphosed under conditions of the amphibolite fades, and possibly, locally under conditions transitional to the granulite facies. In general they have not suffered retrograde metamorphism. Nussbaum Riegel is characterized by isoclinal folds and very well-developed boudinage structure. Examination of the boudins reveals that the competent beds behaved in a ductile manner when failing parallel to the fold axis and in a brittle manner when failing perpendicular to the fold axis. An explanation for this observation is offered, based on variation in strain rate in various directions during the development of the fold. The Garwood Valley areas are complex and two generations of folds are recognized. The large scale structure of the south side of the Garwood Valley is interpreted as a tight basin resulting from the interference of the two generations of folds. The large scale structure of the north side of the Garwood Valley is believed to be similar in style to that of the south side, but insufficient data are obtainable to allow detailed interpretation. Copyright. |
format |
Article in Journal/Newspaper |
author |
Williams, P. F. Hobbs, B. E. Vernon, R. H. Anderson, D. E. |
spellingShingle |
Williams, P. F. Hobbs, B. E. Vernon, R. H. Anderson, D. E. The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica |
author_facet |
Williams, P. F. Hobbs, B. E. Vernon, R. H. Anderson, D. E. |
author_sort |
Williams, P. F. |
title |
The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica |
title_short |
The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica |
title_full |
The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica |
title_fullStr |
The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica |
title_full_unstemmed |
The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica |
title_sort |
structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica |
publishDate |
1971 |
url |
https://researchers.mq.edu.au/en/publications/ebbaeb17-eb5f-4753-afb9-b2091313370d https://doi.org/10.1080/00167617108728751 http://www.scopus.com/inward/record.url?scp=0000015422&partnerID=8YFLogxK |
long_lat |
ENVELOPE(164.283,164.283,-78.033,-78.033) ENVELOPE(164.167,164.167,-78.033,-78.033) ENVELOPE(162.767,162.767,-77.667,-77.667) |
geographic |
Victoria Land McMurdo Sound Garwood Garwood Valley Nussbaum Riegel |
geographic_facet |
Victoria Land McMurdo Sound Garwood Garwood Valley Nussbaum Riegel |
genre |
Antarc* Antarctica Antarctica Journal McMurdo Sound Victoria Land |
genre_facet |
Antarc* Antarctica Antarctica Journal McMurdo Sound Victoria Land |
op_source |
Williams , P F , Hobbs , B E , Vernon , R H & Anderson , D E 1971 , ' The structural and metamorphic geology of basement rocks in the mcmurdo sound area, antarctica ' , Journal of the Geological Society of Australia , vol. 18 , no. 2 , pp. 127-142 . https://doi.org/10.1080/00167617108728751 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1080/00167617108728751 |
container_title |
Journal of the Geological Society of Australia |
container_volume |
18 |
container_issue |
2 |
container_start_page |
127 |
op_container_end_page |
142 |
_version_ |
1766255030258630656 |