Extent of the Ross Orogen in Antarctica: new data from DSDP 270 and Iselin Bank
Abstract The Ross Sea is bordered by the Late Precambrian–Cambrian Ross–Delamerian Orogen of East Antarctica and the more Pacific-ward Ordovician–Silurian Lachlan–Tuhua–Robertson Bay–Swanson Orogen. A calcsilicate gneiss from Deep Sea Drilling Project 270 drill hole in the central Ross Sea, Antarcti...
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Online Access: | http://dx.doi.org/10.1017/s0954102010000969 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102010000969 |
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crcambridgeupr:10.1017/s0954102010000969 2024-04-28T08:02:53+00:00 Extent of the Ross Orogen in Antarctica: new data from DSDP 270 and Iselin Bank Mortimer, N. Palin, J.M. Dunlap, W.J. Hauff, F. 2011 http://dx.doi.org/10.1017/s0954102010000969 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102010000969 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 23, issue 3, page 297-306 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2011 crcambridgeupr https://doi.org/10.1017/s0954102010000969 2024-04-02T06:55:12Z Abstract The Ross Sea is bordered by the Late Precambrian–Cambrian Ross–Delamerian Orogen of East Antarctica and the more Pacific-ward Ordovician–Silurian Lachlan–Tuhua–Robertson Bay–Swanson Orogen. A calcsilicate gneiss from Deep Sea Drilling Project 270 drill hole in the central Ross Sea, Antarctica, gives a U-Pb titanite age of 437 ± 6 Ma (2σ). This age of high-grade metamorphism is too young for typical Ross Orogen. Based on this age, and on lithology, we propose a provisional correlation with the Early Palaeozoic Lachlan–Tuhua–Robertson Bay–Swanson Orogen, and possibly the Bowers Terrane of northern Victoria Land. A metamorphosed porphyritic rhyolite dredged from the Iselin Bank, northern Ross Sea, gives a U-Pb zircon age of 545 ± 32 Ma (2σ). The U-Pb age, petrochemistry, Ar-Ar K-feldspar dating, and Sr and Nd isotopic ratios indicate a correlation with Late Proterozoic–Cambrian igneous protoliths of the Ross Orogen. If the Iselin Bank rhyolite is not ice-rafted debris, then it represents a further intriguing occurrence of Ross basement found outside the main Ross–Delamerian Orogen. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica East Antarctica Ross Sea Victoria Land Cambridge University Press Antarctic Science 23 3 297 306 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
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Geology Ecology, Evolution, Behavior and Systematics Oceanography Mortimer, N. Palin, J.M. Dunlap, W.J. Hauff, F. Extent of the Ross Orogen in Antarctica: new data from DSDP 270 and Iselin Bank |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract The Ross Sea is bordered by the Late Precambrian–Cambrian Ross–Delamerian Orogen of East Antarctica and the more Pacific-ward Ordovician–Silurian Lachlan–Tuhua–Robertson Bay–Swanson Orogen. A calcsilicate gneiss from Deep Sea Drilling Project 270 drill hole in the central Ross Sea, Antarctica, gives a U-Pb titanite age of 437 ± 6 Ma (2σ). This age of high-grade metamorphism is too young for typical Ross Orogen. Based on this age, and on lithology, we propose a provisional correlation with the Early Palaeozoic Lachlan–Tuhua–Robertson Bay–Swanson Orogen, and possibly the Bowers Terrane of northern Victoria Land. A metamorphosed porphyritic rhyolite dredged from the Iselin Bank, northern Ross Sea, gives a U-Pb zircon age of 545 ± 32 Ma (2σ). The U-Pb age, petrochemistry, Ar-Ar K-feldspar dating, and Sr and Nd isotopic ratios indicate a correlation with Late Proterozoic–Cambrian igneous protoliths of the Ross Orogen. If the Iselin Bank rhyolite is not ice-rafted debris, then it represents a further intriguing occurrence of Ross basement found outside the main Ross–Delamerian Orogen. |
format |
Article in Journal/Newspaper |
author |
Mortimer, N. Palin, J.M. Dunlap, W.J. Hauff, F. |
author_facet |
Mortimer, N. Palin, J.M. Dunlap, W.J. Hauff, F. |
author_sort |
Mortimer, N. |
title |
Extent of the Ross Orogen in Antarctica: new data from DSDP 270 and Iselin Bank |
title_short |
Extent of the Ross Orogen in Antarctica: new data from DSDP 270 and Iselin Bank |
title_full |
Extent of the Ross Orogen in Antarctica: new data from DSDP 270 and Iselin Bank |
title_fullStr |
Extent of the Ross Orogen in Antarctica: new data from DSDP 270 and Iselin Bank |
title_full_unstemmed |
Extent of the Ross Orogen in Antarctica: new data from DSDP 270 and Iselin Bank |
title_sort |
extent of the ross orogen in antarctica: new data from dsdp 270 and iselin bank |
publisher |
Cambridge University Press (CUP) |
publishDate |
2011 |
url |
http://dx.doi.org/10.1017/s0954102010000969 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102010000969 |
genre |
Antarc* Antarctic Science Antarctica East Antarctica Ross Sea Victoria Land |
genre_facet |
Antarc* Antarctic Science Antarctica East Antarctica Ross Sea Victoria Land |
op_source |
Antarctic Science volume 23, issue 3, page 297-306 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102010000969 |
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Antarctic Science |
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23 |
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3 |
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297 |
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306 |
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1797574130518720512 |