Timing and Metamorphic Evolution of the Ross Orogeny in and around the Mountaineer Range, Northern Victoria Land, Antarctica
The Ross(–Delamerian) Orogeny significantly impacted the formation of the tectonic structure of the Pacific Gondwana margin during the early Paleozoic era. Northern Victoria Land (NVL) in Antarctica preserves the aspect of the Ross Orogeny that led to the union of the Wilson (WT)–Bowers (BT)–Roberts...
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2020
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ftdoajarticles:oai:doaj.org/article:b1aad4d4a65347a19f49c4d7db22b534 2023-05-15T13:59:44+02:00 Timing and Metamorphic Evolution of the Ross Orogeny in and around the Mountaineer Range, Northern Victoria Land, Antarctica Sang-Bong Yi Mi Jung Lee Jong Ik Lee Hwayoung Kim 2020-10-01T00:00:00Z https://doi.org/10.3390/min10100908 https://doaj.org/article/b1aad4d4a65347a19f49c4d7db22b534 EN eng MDPI AG https://www.mdpi.com/2075-163X/10/10/908 https://doaj.org/toc/2075-163X doi:10.3390/min10100908 2075-163X https://doaj.org/article/b1aad4d4a65347a19f49c4d7db22b534 Minerals, Vol 10, Iss 908, p 908 (2020) Antarctica Gondwana margin Ross Orogeny Northern Victoria Land Dessent Unit tectonic slice Mineralogy QE351-399.2 article 2020 ftdoajarticles https://doi.org/10.3390/min10100908 2022-12-31T03:42:15Z The Ross(–Delamerian) Orogeny significantly impacted the formation of the tectonic structure of the Pacific Gondwana margin during the early Paleozoic era. Northern Victoria Land (NVL) in Antarctica preserves the aspect of the Ross Orogeny that led to the union of the Wilson (WT)–Bowers (BT)–Robertson Bay Terrane. The aspect of the Ross Orogeny in the NVL is characterized by subduction of oceanic domains toward the continental margin (continental arc) and the accretion of the associated marine–continental substances from 530–480 Ma. In the Mountaineer Range in NVL, the Ross Orogeny strain zone is identified at the WT/BT boundary regions. In these areas, fold and thrust shear zones are observed and aspects of them can be seen at Mt. Murchison, the Descent Unit and the Black Spider Greenschist zone. The Dessent Unit corresponds to a tectonic slice sheared between the WT and BT. The metamorphic evolution phase of the Dessent Unit is summarized in the peak pressure (M 1 ), peak temperature (M 2 ) and retrograde (M 3 ). The sensitive high-resolution ion microprobe (SHRIMP) zircon U–Pb ages of 514.6 ± 2.0 Ma and 499.2 ± 3.4 Ma obtained from the Dessent Unit amphibolite are comparable to the M 1 and M 2 stages, respectively. The Dessent Unit underwent intermediate pressure (P)/temperature (T)-type metamorphism characterized by 10.0–10.5 kbar/~600 °C (M 1 ) and ~7 kbar/~700 °C (M 2 ) followed by 4.0–4.5 kbar/~450 °C (M 3 ). Mafic to intermediate magmatism (497–501 Ma) within the WT/BT boundary region may have given rise to the M 2 stage of the Dessent Unit, and this magmatism is synchronous with the migmatization period of Mt. Murchison (498.3 ± 3.4 Ma). This indicates that a continuous process of fold-shearing–magmatic intrusion–partial melting, which is typically associated with a continental arc orogeny, occurred before and after c. 500 Ma in the Mountaineer Range. During the Ross Orogeny, the Dessent unit was initially subducted underneath the WT at depth (10.0–10.5 kbar, ~35 km) and then thrust into the shallow (~7 ... Article in Journal/Newspaper Antarc* Antarctica Victoria Land Directory of Open Access Journals: DOAJ Articles Bowers ENVELOPE(164.083,164.083,-85.000,-85.000) Mountaineer Range ENVELOPE(166.250,166.250,-73.467,-73.467) Murchison ENVELOPE(144.250,144.250,-67.317,-67.317) Pacific Robertson Bay ENVELOPE(170.000,170.000,-71.417,-71.417) Victoria Land Minerals 10 10 908 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctica Gondwana margin Ross Orogeny Northern Victoria Land Dessent Unit tectonic slice Mineralogy QE351-399.2 |
spellingShingle |
Antarctica Gondwana margin Ross Orogeny Northern Victoria Land Dessent Unit tectonic slice Mineralogy QE351-399.2 Sang-Bong Yi Mi Jung Lee Jong Ik Lee Hwayoung Kim Timing and Metamorphic Evolution of the Ross Orogeny in and around the Mountaineer Range, Northern Victoria Land, Antarctica |
topic_facet |
Antarctica Gondwana margin Ross Orogeny Northern Victoria Land Dessent Unit tectonic slice Mineralogy QE351-399.2 |
description |
The Ross(–Delamerian) Orogeny significantly impacted the formation of the tectonic structure of the Pacific Gondwana margin during the early Paleozoic era. Northern Victoria Land (NVL) in Antarctica preserves the aspect of the Ross Orogeny that led to the union of the Wilson (WT)–Bowers (BT)–Robertson Bay Terrane. The aspect of the Ross Orogeny in the NVL is characterized by subduction of oceanic domains toward the continental margin (continental arc) and the accretion of the associated marine–continental substances from 530–480 Ma. In the Mountaineer Range in NVL, the Ross Orogeny strain zone is identified at the WT/BT boundary regions. In these areas, fold and thrust shear zones are observed and aspects of them can be seen at Mt. Murchison, the Descent Unit and the Black Spider Greenschist zone. The Dessent Unit corresponds to a tectonic slice sheared between the WT and BT. The metamorphic evolution phase of the Dessent Unit is summarized in the peak pressure (M 1 ), peak temperature (M 2 ) and retrograde (M 3 ). The sensitive high-resolution ion microprobe (SHRIMP) zircon U–Pb ages of 514.6 ± 2.0 Ma and 499.2 ± 3.4 Ma obtained from the Dessent Unit amphibolite are comparable to the M 1 and M 2 stages, respectively. The Dessent Unit underwent intermediate pressure (P)/temperature (T)-type metamorphism characterized by 10.0–10.5 kbar/~600 °C (M 1 ) and ~7 kbar/~700 °C (M 2 ) followed by 4.0–4.5 kbar/~450 °C (M 3 ). Mafic to intermediate magmatism (497–501 Ma) within the WT/BT boundary region may have given rise to the M 2 stage of the Dessent Unit, and this magmatism is synchronous with the migmatization period of Mt. Murchison (498.3 ± 3.4 Ma). This indicates that a continuous process of fold-shearing–magmatic intrusion–partial melting, which is typically associated with a continental arc orogeny, occurred before and after c. 500 Ma in the Mountaineer Range. During the Ross Orogeny, the Dessent unit was initially subducted underneath the WT at depth (10.0–10.5 kbar, ~35 km) and then thrust into the shallow (~7 ... |
format |
Article in Journal/Newspaper |
author |
Sang-Bong Yi Mi Jung Lee Jong Ik Lee Hwayoung Kim |
author_facet |
Sang-Bong Yi Mi Jung Lee Jong Ik Lee Hwayoung Kim |
author_sort |
Sang-Bong Yi |
title |
Timing and Metamorphic Evolution of the Ross Orogeny in and around the Mountaineer Range, Northern Victoria Land, Antarctica |
title_short |
Timing and Metamorphic Evolution of the Ross Orogeny in and around the Mountaineer Range, Northern Victoria Land, Antarctica |
title_full |
Timing and Metamorphic Evolution of the Ross Orogeny in and around the Mountaineer Range, Northern Victoria Land, Antarctica |
title_fullStr |
Timing and Metamorphic Evolution of the Ross Orogeny in and around the Mountaineer Range, Northern Victoria Land, Antarctica |
title_full_unstemmed |
Timing and Metamorphic Evolution of the Ross Orogeny in and around the Mountaineer Range, Northern Victoria Land, Antarctica |
title_sort |
timing and metamorphic evolution of the ross orogeny in and around the mountaineer range, northern victoria land, antarctica |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/min10100908 https://doaj.org/article/b1aad4d4a65347a19f49c4d7db22b534 |
long_lat |
ENVELOPE(164.083,164.083,-85.000,-85.000) ENVELOPE(166.250,166.250,-73.467,-73.467) ENVELOPE(144.250,144.250,-67.317,-67.317) ENVELOPE(170.000,170.000,-71.417,-71.417) |
geographic |
Bowers Mountaineer Range Murchison Pacific Robertson Bay Victoria Land |
geographic_facet |
Bowers Mountaineer Range Murchison Pacific Robertson Bay Victoria Land |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_source |
Minerals, Vol 10, Iss 908, p 908 (2020) |
op_relation |
https://www.mdpi.com/2075-163X/10/10/908 https://doaj.org/toc/2075-163X doi:10.3390/min10100908 2075-163X https://doaj.org/article/b1aad4d4a65347a19f49c4d7db22b534 |
op_doi |
https://doi.org/10.3390/min10100908 |
container_title |
Minerals |
container_volume |
10 |
container_issue |
10 |
container_start_page |
908 |
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1766268501729738752 |