Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica
During the Cambrian and Ordovician, widespread magmatic activity occurred in the Ross Orogen of central Antarctica, forming the Granite Harbor Intrusives and Terra Nova Intrusive Complex. In the Terra Nova Intrusive Complex, the latest magmatic activity comprised the emplacement of the Abbott Unit (...
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ftarcticportal:oai:generic.eprints.org:2681 2023-12-10T09:39:00+01:00 Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica Hong, Chen Wei, Wang Yue, Zhao 2019-03 application/pdf http://library.arcticportal.org/2681/ http://library.arcticportal.org/2681/1/A1901005.pdf en eng Polar Research Institute of China - PRIC http://library.arcticportal.org/2681/1/A1901005.pdf Hong, Chen and Wei, Wang and Yue, Zhao (2019) Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica. Advances in Polar Science, 30 (5). pp. 52-69. Terrestrial Article PeerReviewed 2019 ftarcticportal 2023-11-15T23:54:41Z During the Cambrian and Ordovician, widespread magmatic activity occurred in the Ross Orogen of central Antarctica, forming the Granite Harbor Intrusives and Terra Nova Intrusive Complex. In the Terra Nova Intrusive Complex, the latest magmatic activity comprised the emplacement of the Abbott Unit (508 Ma) and the Vegetation Unit (~475 Ma), which were formed in different tectonic settings. Owing to their similar lithological features, the tectonic transformation that occurred between the formation of these two units has not been well studied. Through a detailed geological field investigation and geochemical and geochronological analyses, four types of magmatic rock—basalt, syenite, mafic veins, and granite veins—were identified on Inexpressible Island, Northern Victoria Land. Our SHRIMP (Sensitive High Resolution Ion Micro Probe) zircon U–Pb ages of the basalt and the granite veins are 504.7 ± 3.1 and 495.5 ± 4.9 Ma, respectively. Major- and trace-element data indicate a continental-margin island-arc setting for the formation of these two rock types. The zircon U–Pb ages of the syenite and the monzodiorite veins are 485.8 ± 5.7 and 478.5 ± 4.0 Ma, respectively. Major- and trace-element compositions suggest a collisional setting for the former and an intracontinental extensional setting for the latter. These results elucidate the evolution from subduction to collision and intracontinental extension in Northern Victoria Land during the 20 Ma spanning the late Cambrian–Early Ordovician and improve our understanding of the tectonics and evolution of the Ross Orogen in the Transantarctic Mountains. Article in Journal/Newspaper Advances in Polar Science Antarc* Antarctica Inexpressible Island Polar Science Polar Science Victoria Land Arctic Portal Library Victoria Land Transantarctic Mountains Abbott ENVELOPE(-62.133,-62.133,-64.100,-64.100) Inexpressible Island ENVELOPE(163.650,163.650,-74.900,-74.900) Granite Harbor ENVELOPE(162.733,162.733,-76.883,-76.883) |
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Arctic Portal Library |
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English |
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Terrestrial |
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Terrestrial Hong, Chen Wei, Wang Yue, Zhao Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica |
topic_facet |
Terrestrial |
description |
During the Cambrian and Ordovician, widespread magmatic activity occurred in the Ross Orogen of central Antarctica, forming the Granite Harbor Intrusives and Terra Nova Intrusive Complex. In the Terra Nova Intrusive Complex, the latest magmatic activity comprised the emplacement of the Abbott Unit (508 Ma) and the Vegetation Unit (~475 Ma), which were formed in different tectonic settings. Owing to their similar lithological features, the tectonic transformation that occurred between the formation of these two units has not been well studied. Through a detailed geological field investigation and geochemical and geochronological analyses, four types of magmatic rock—basalt, syenite, mafic veins, and granite veins—were identified on Inexpressible Island, Northern Victoria Land. Our SHRIMP (Sensitive High Resolution Ion Micro Probe) zircon U–Pb ages of the basalt and the granite veins are 504.7 ± 3.1 and 495.5 ± 4.9 Ma, respectively. Major- and trace-element data indicate a continental-margin island-arc setting for the formation of these two rock types. The zircon U–Pb ages of the syenite and the monzodiorite veins are 485.8 ± 5.7 and 478.5 ± 4.0 Ma, respectively. Major- and trace-element compositions suggest a collisional setting for the former and an intracontinental extensional setting for the latter. These results elucidate the evolution from subduction to collision and intracontinental extension in Northern Victoria Land during the 20 Ma spanning the late Cambrian–Early Ordovician and improve our understanding of the tectonics and evolution of the Ross Orogen in the Transantarctic Mountains. |
format |
Article in Journal/Newspaper |
author |
Hong, Chen Wei, Wang Yue, Zhao |
author_facet |
Hong, Chen Wei, Wang Yue, Zhao |
author_sort |
Hong, Chen |
title |
Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica |
title_short |
Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica |
title_full |
Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica |
title_fullStr |
Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica |
title_full_unstemmed |
Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica |
title_sort |
constraints on early paleozoic magmatic processes and tectonic setting of inexpressible island, northern victoria land, antarctica |
publisher |
Polar Research Institute of China - PRIC |
publishDate |
2019 |
url |
http://library.arcticportal.org/2681/ http://library.arcticportal.org/2681/1/A1901005.pdf |
long_lat |
ENVELOPE(-62.133,-62.133,-64.100,-64.100) ENVELOPE(163.650,163.650,-74.900,-74.900) ENVELOPE(162.733,162.733,-76.883,-76.883) |
geographic |
Victoria Land Transantarctic Mountains Abbott Inexpressible Island Granite Harbor |
geographic_facet |
Victoria Land Transantarctic Mountains Abbott Inexpressible Island Granite Harbor |
genre |
Advances in Polar Science Antarc* Antarctica Inexpressible Island Polar Science Polar Science Victoria Land |
genre_facet |
Advances in Polar Science Antarc* Antarctica Inexpressible Island Polar Science Polar Science Victoria Land |
op_relation |
http://library.arcticportal.org/2681/1/A1901005.pdf Hong, Chen and Wei, Wang and Yue, Zhao (2019) Constraints on early Paleozoic magmatic processes and tectonic setting of Inexpressible Island, Northern Victoria Land, Antarctica. Advances in Polar Science, 30 (5). pp. 52-69. |
_version_ |
1784892778055991296 |