Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin
The Transantarctic Mountains across the central Antarctic continent are the Ross orogenic belt formed by westward subduction of the Paleo-Pacific underneath the East Gondwana active continent margin in the early Paleozoic. The sedimentary, deformation and metamorphism, and granitic magmatic intrusio...
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Institute of Geomechanics, Chinese Academy of Geological Sciences
2021
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ftdoajarticles:oai:doaj.org/article:f67169c29f554c6caf669ad4426f3c9e 2023-05-15T13:56:54+02:00 Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin CHEN Hong WANG Honghui BAO Guodong 2021-10-01T00:00:00Z https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.065 https://doaj.org/article/f67169c29f554c6caf669ad4426f3c9e ZH chi Institute of Geomechanics, Chinese Academy of Geological Sciences https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2021.27.05.065 https://doaj.org/toc/1006-6616 1006-6616 doi:10.12090/j.issn.1006-6616.2021.27.05.065 https://doaj.org/article/f67169c29f554c6caf669ad4426f3c9e Dizhi lixue xuebao, Vol 27, Iss 5, Pp 796-808 (2021) ross orogeny detrital zircon subglacial geology northern victoria land antarctica Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.065 2023-02-26T01:33:39Z The Transantarctic Mountains across the central Antarctic continent are the Ross orogenic belt formed by westward subduction of the Paleo-Pacific underneath the East Gondwana active continent margin in the early Paleozoic. The sedimentary, deformation and metamorphism, and granitic magmatic intrusion in this stage represent the process of the Ross Orogeny. Due to the significant difference in age among the three elements mentioned above, there is no precise time defined on the Ross Orogeny. In this paper, detrital zircon U-Pb dating of gravel and sand samples from moraines and coastal sediments in the Inexpressible Island of Northern Victoria Land was carried out. The ages of four samples with different gravel diameters range from 2443 to 323 Ma and are mainly concentrated between 530~450 Ma, with a peak age of~485 Ma. Most of the zircons show oscillatory zoning in CL images and have Th/U ratios great than 0.1 (mainly>0.4), with REE characteristics indicating a magmatic origin. Therefore, these ages reflect the timing of magmatic activity in the provenance of the loose sediment samples. The age composition of detrital zircons is consistent with the age of magmatic intrusion, intracontinental deformation and depositional stratigraphy in the surrounding areas, suggesting that the magmatic activity in the Northern Victoria Land and its surrounding areas might have lasted up to 450 Ma in the intracontinental deformation stage, which may represent the end time of the Ross Orogeny. These results provide a new constraint for the tectonic evolution of the Ross Orogeny on the Gondwana continental margin. Article in Journal/Newspaper Antarc* Antarctic Antarctica Inexpressible Island Victoria Land Directory of Open Access Journals: DOAJ Articles Antarctic Victoria Land Transantarctic Mountains Pacific Inexpressible Island ENVELOPE(163.650,163.650,-74.900,-74.900) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Chinese |
topic |
ross orogeny detrital zircon subglacial geology northern victoria land antarctica Geology QE1-996.5 |
spellingShingle |
ross orogeny detrital zircon subglacial geology northern victoria land antarctica Geology QE1-996.5 CHEN Hong WANG Honghui BAO Guodong Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin |
topic_facet |
ross orogeny detrital zircon subglacial geology northern victoria land antarctica Geology QE1-996.5 |
description |
The Transantarctic Mountains across the central Antarctic continent are the Ross orogenic belt formed by westward subduction of the Paleo-Pacific underneath the East Gondwana active continent margin in the early Paleozoic. The sedimentary, deformation and metamorphism, and granitic magmatic intrusion in this stage represent the process of the Ross Orogeny. Due to the significant difference in age among the three elements mentioned above, there is no precise time defined on the Ross Orogeny. In this paper, detrital zircon U-Pb dating of gravel and sand samples from moraines and coastal sediments in the Inexpressible Island of Northern Victoria Land was carried out. The ages of four samples with different gravel diameters range from 2443 to 323 Ma and are mainly concentrated between 530~450 Ma, with a peak age of~485 Ma. Most of the zircons show oscillatory zoning in CL images and have Th/U ratios great than 0.1 (mainly>0.4), with REE characteristics indicating a magmatic origin. Therefore, these ages reflect the timing of magmatic activity in the provenance of the loose sediment samples. The age composition of detrital zircons is consistent with the age of magmatic intrusion, intracontinental deformation and depositional stratigraphy in the surrounding areas, suggesting that the magmatic activity in the Northern Victoria Land and its surrounding areas might have lasted up to 450 Ma in the intracontinental deformation stage, which may represent the end time of the Ross Orogeny. These results provide a new constraint for the tectonic evolution of the Ross Orogeny on the Gondwana continental margin. |
format |
Article in Journal/Newspaper |
author |
CHEN Hong WANG Honghui BAO Guodong |
author_facet |
CHEN Hong WANG Honghui BAO Guodong |
author_sort |
CHEN Hong |
title |
Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin |
title_short |
Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin |
title_full |
Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin |
title_fullStr |
Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin |
title_full_unstemmed |
Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin |
title_sort |
detrital zircon age from the glacial and littoral deposit, northern victoria land, antarctica: implications for the timing of magmatic activity of the ross orogeny on the gondwana continental margin |
publisher |
Institute of Geomechanics, Chinese Academy of Geological Sciences |
publishDate |
2021 |
url |
https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.065 https://doaj.org/article/f67169c29f554c6caf669ad4426f3c9e |
long_lat |
ENVELOPE(163.650,163.650,-74.900,-74.900) |
geographic |
Antarctic Victoria Land Transantarctic Mountains Pacific Inexpressible Island |
geographic_facet |
Antarctic Victoria Land Transantarctic Mountains Pacific Inexpressible Island |
genre |
Antarc* Antarctic Antarctica Inexpressible Island Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Inexpressible Island Victoria Land |
op_source |
Dizhi lixue xuebao, Vol 27, Iss 5, Pp 796-808 (2021) |
op_relation |
https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2021.27.05.065 https://doaj.org/toc/1006-6616 1006-6616 doi:10.12090/j.issn.1006-6616.2021.27.05.065 https://doaj.org/article/f67169c29f554c6caf669ad4426f3c9e |
op_doi |
https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.065 |
_version_ |
1766264507528642560 |