Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages
We present new zircon U-Pb isotopic data for volcanic rocks from deformed metavolcanic-sedimentary successions of the widespread Ross Supergroup in the Queen Maud Mountains, Antarctica. Zircon U-Pb analyses of Liv Group volcanic rocks thought to be Neoproterozoic in age instead have early Paleozoic...
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Online Access: | http://hdl.handle.net/10150/627885 https://doi.org/10.1086/697036 |
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ftunivarizona:oai:repository.arizona.edu:10150/627885 2023-05-15T13:50:18+02:00 Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages Paulsen, Timothy S. Encarnación, John Grunow, Anne M. Stump, Edmund Pecha, Mark Valencia, Victor A. Univ Arizona, Dept Geosci 2018-05 http://hdl.handle.net/10150/627885 https://doi.org/10.1086/697036 en eng UNIV CHICAGO PRESS http://www.journals.uchicago.edu/doi/10.1086/697036 Paulsen, T. S., Encarnación, J., Grunow, A. M., Stump, E., Pecha, M., & Valencia, V. A. (2018). Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages. The Journal of Geology, 126(3), 307-323. 0022-1376 1537-5269 doi:10.1086/697036 http://hdl.handle.net/10150/627885 JOURNAL OF GEOLOGY © 2018 by The University of Chicago. All rights reserved. The Journal of Geology 126 3 307 323 Article 2018 ftunivarizona https://doi.org/10.1086/697036 2020-06-14T08:16:23Z We present new zircon U-Pb isotopic data for volcanic rocks from deformed metavolcanic-sedimentary successions of the widespread Ross Supergroup in the Queen Maud Mountains, Antarctica. Zircon U-Pb analyses of Liv Group volcanic rocks thought to be Neoproterozoic in age instead have early Paleozoic ages. Zircon U-Pb analyses of five samples assigned to the Fairweather Formation have yielded 524 +/- 9 to 514 +/- 9 Ma (2 sigma) crystallization ages, whereas six samples assigned to the Taylor Formation have yielded 510 +/- 12 to 490 +/- 6 Ma (2 sigma) crystallization ages. Although these ages imply that the Fairweather Formation is generally older than the Taylor Formation, the age uncertainties show a 17-My overlap that is consistent with previous suggestions for temporal correlation of these formations. On a regional scale, Liv Group volcanism overlapped with the emplacement of approximate to 535-490 Ma plutonic rocks associated with the early Paleozoic Queen Maud batholith as well as igneous rocks found elsewhere along the early Paleozoic Pacific-Gondwana margin. Collectively, these igneous rocks provide plausible zircon sources for similar age detrital zircon populations found in outboard siliciclastic rocks belonging to the Leverett, Taylor, Fairweather, Greenlee, and Starshot Formations of the Queen Maud Mountains. The youngest crystallization age yielded by the deformed Taylor Formation (approximate to 490 Ma) assumes regional significance because it represents the youngest volcanic rock yet identified within the Ross orogen in Antarctica and provides important new evidence for latest Cambrian or younger deformation, possibly associated with orogenic collapse during slab rollback at the terminal stages of the Ross orogeny. National Science Foundation (NSF) [OPP-9317673]; NSF [OPP-0835480, OPP-9726104, EAR-0443387]; EAA/C. R. Meyer endowed professorship; EAA/Edward Penson endowed professorship 12 month embargo; published online: 13 March 2018 This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. Article in Journal/Newspaper Antarc* Antarctica The University of Arizona: UA Campus Repository Fairweather ENVELOPE(-61.083,-61.083,-65.017,-65.017) Greenlee ENVELOPE(-177.000,-177.000,-84.850,-84.850) Pacific The Journal of Geology 126 3 307 323 |
institution |
Open Polar |
collection |
The University of Arizona: UA Campus Repository |
op_collection_id |
ftunivarizona |
language |
English |
description |
We present new zircon U-Pb isotopic data for volcanic rocks from deformed metavolcanic-sedimentary successions of the widespread Ross Supergroup in the Queen Maud Mountains, Antarctica. Zircon U-Pb analyses of Liv Group volcanic rocks thought to be Neoproterozoic in age instead have early Paleozoic ages. Zircon U-Pb analyses of five samples assigned to the Fairweather Formation have yielded 524 +/- 9 to 514 +/- 9 Ma (2 sigma) crystallization ages, whereas six samples assigned to the Taylor Formation have yielded 510 +/- 12 to 490 +/- 6 Ma (2 sigma) crystallization ages. Although these ages imply that the Fairweather Formation is generally older than the Taylor Formation, the age uncertainties show a 17-My overlap that is consistent with previous suggestions for temporal correlation of these formations. On a regional scale, Liv Group volcanism overlapped with the emplacement of approximate to 535-490 Ma plutonic rocks associated with the early Paleozoic Queen Maud batholith as well as igneous rocks found elsewhere along the early Paleozoic Pacific-Gondwana margin. Collectively, these igneous rocks provide plausible zircon sources for similar age detrital zircon populations found in outboard siliciclastic rocks belonging to the Leverett, Taylor, Fairweather, Greenlee, and Starshot Formations of the Queen Maud Mountains. The youngest crystallization age yielded by the deformed Taylor Formation (approximate to 490 Ma) assumes regional significance because it represents the youngest volcanic rock yet identified within the Ross orogen in Antarctica and provides important new evidence for latest Cambrian or younger deformation, possibly associated with orogenic collapse during slab rollback at the terminal stages of the Ross orogeny. National Science Foundation (NSF) [OPP-9317673]; NSF [OPP-0835480, OPP-9726104, EAR-0443387]; EAA/C. R. Meyer endowed professorship; EAA/Edward Penson endowed professorship 12 month embargo; published online: 13 March 2018 This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. |
author2 |
Univ Arizona, Dept Geosci |
format |
Article in Journal/Newspaper |
author |
Paulsen, Timothy S. Encarnación, John Grunow, Anne M. Stump, Edmund Pecha, Mark Valencia, Victor A. |
spellingShingle |
Paulsen, Timothy S. Encarnación, John Grunow, Anne M. Stump, Edmund Pecha, Mark Valencia, Victor A. Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages |
author_facet |
Paulsen, Timothy S. Encarnación, John Grunow, Anne M. Stump, Edmund Pecha, Mark Valencia, Victor A. |
author_sort |
Paulsen, Timothy S. |
title |
Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages |
title_short |
Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages |
title_full |
Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages |
title_fullStr |
Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages |
title_full_unstemmed |
Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages |
title_sort |
correlation and late-stage deformation of liv group volcanics in the ross-delamerian orogen, antarctica, from new u-pb ages |
publisher |
UNIV CHICAGO PRESS |
publishDate |
2018 |
url |
http://hdl.handle.net/10150/627885 https://doi.org/10.1086/697036 |
long_lat |
ENVELOPE(-61.083,-61.083,-65.017,-65.017) ENVELOPE(-177.000,-177.000,-84.850,-84.850) |
geographic |
Fairweather Greenlee Pacific |
geographic_facet |
Fairweather Greenlee Pacific |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
The Journal of Geology 126 3 307 323 |
op_relation |
http://www.journals.uchicago.edu/doi/10.1086/697036 Paulsen, T. S., Encarnación, J., Grunow, A. M., Stump, E., Pecha, M., & Valencia, V. A. (2018). Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages. The Journal of Geology, 126(3), 307-323. 0022-1376 1537-5269 doi:10.1086/697036 http://hdl.handle.net/10150/627885 JOURNAL OF GEOLOGY |
op_rights |
© 2018 by The University of Chicago. All rights reserved. |
op_doi |
https://doi.org/10.1086/697036 |
container_title |
The Journal of Geology |
container_volume |
126 |
container_issue |
3 |
container_start_page |
307 |
op_container_end_page |
323 |
_version_ |
1766253329030053888 |