Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia
Early Jurassic silicic volcanic rocks of the Chon Aike Province (V1: 187 – 182 Ma) are recognized from many localities in the southern Antarctic Peninsula and NE Patagonia and are essentially coeval with the extensive Karoo (182 Ma) and Ferrar (183 Ma) large igneous provinces of pre-breakup Gondwana...
Published in: | Journal of the Geological Society |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Society of London
2017
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/513439/ https://nora.nerc.ac.uk/id/eprint/513439/1/Riley%20et%20al.%20JGSL.pdf http://jgs.lyellcollection.org/content/early/2016/10/20/jgs2016-053.abstract |
id |
ftnerc:oai:nora.nerc.ac.uk:513439 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:513439 2024-01-21T10:01:08+01:00 Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia Riley, Teal R. Flowerdew, Michael J. Pankhurst, Robert J. Curtis, Mike L. Millar, Ian L. Fanning, C. Mark Whitehouse, Martin J. 2017-03 text http://nora.nerc.ac.uk/id/eprint/513439/ https://nora.nerc.ac.uk/id/eprint/513439/1/Riley%20et%20al.%20JGSL.pdf http://jgs.lyellcollection.org/content/early/2016/10/20/jgs2016-053.abstract en eng Geological Society of London https://nora.nerc.ac.uk/id/eprint/513439/1/Riley%20et%20al.%20JGSL.pdf Riley, Teal R. orcid:0000-0002-3333-5021 Flowerdew, Michael J.; Pankhurst, Robert J.; Curtis, Mike L.; Millar, Ian L.; Fanning, C. Mark; Whitehouse, Martin J. 2017 Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia. Journal of the Geological Society, 174 (2). 365-376. https://doi.org/10.1144/jgs2016-053 <https://doi.org/10.1144/jgs2016-053> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1144/jgs2016-053 2023-12-22T00:03:08Z Early Jurassic silicic volcanic rocks of the Chon Aike Province (V1: 187 – 182 Ma) are recognized from many localities in the southern Antarctic Peninsula and NE Patagonia and are essentially coeval with the extensive Karoo (182 Ma) and Ferrar (183 Ma) large igneous provinces of pre-breakup Gondwana. Until recently, plutonic rocks of this age were considered either rare in or absent from the Antarctic Peninsula batholith, which was thought to have been mainly constructed during the Middle Jurassic and the mid-Cretaceous. New U–Pb zircon geochronology from the Antarctic Peninsula and recently published U–Pb ages from elsewhere in the Peninsula and Patagonia are used to demonstrate the more widespread nature of Early Jurassic plutonism. Eight samples are dated here from the central and southern Antarctic Peninsula. They are all moderately to strongly foliated granitoids (tonalite, granite, granodiorite) and locally represent the crystalline basement. They yield ages in the range 188 – 181 Ma, which overlap with published ages of 185 – 180 Ma from granitoids from elsewhere on the Antarctic Peninsula and from the Subcordilleran plutonic belt of Patagonia (185 – 181 Ma). Whereas Early Jurassic plutons of the Subcordilleran plutonic belt of Patagonia are directly related to subduction processes along the proto-Pacific margin of Gondwana, coeval volcanic rocks of the Chon Aike Province are interpreted to be directly associated with extension and plume activity during the initial stages of Gondwana breakup. This indicates that subduction was continuing when Chon Aike Province volcanism started. The Early Jurassic plutonism on the Antarctic Peninsula is transitional between subduction-related and breakup-related magmatism. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Patagonia Pacific Journal of the Geological Society 174 2 365 376 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Early Jurassic silicic volcanic rocks of the Chon Aike Province (V1: 187 – 182 Ma) are recognized from many localities in the southern Antarctic Peninsula and NE Patagonia and are essentially coeval with the extensive Karoo (182 Ma) and Ferrar (183 Ma) large igneous provinces of pre-breakup Gondwana. Until recently, plutonic rocks of this age were considered either rare in or absent from the Antarctic Peninsula batholith, which was thought to have been mainly constructed during the Middle Jurassic and the mid-Cretaceous. New U–Pb zircon geochronology from the Antarctic Peninsula and recently published U–Pb ages from elsewhere in the Peninsula and Patagonia are used to demonstrate the more widespread nature of Early Jurassic plutonism. Eight samples are dated here from the central and southern Antarctic Peninsula. They are all moderately to strongly foliated granitoids (tonalite, granite, granodiorite) and locally represent the crystalline basement. They yield ages in the range 188 – 181 Ma, which overlap with published ages of 185 – 180 Ma from granitoids from elsewhere on the Antarctic Peninsula and from the Subcordilleran plutonic belt of Patagonia (185 – 181 Ma). Whereas Early Jurassic plutons of the Subcordilleran plutonic belt of Patagonia are directly related to subduction processes along the proto-Pacific margin of Gondwana, coeval volcanic rocks of the Chon Aike Province are interpreted to be directly associated with extension and plume activity during the initial stages of Gondwana breakup. This indicates that subduction was continuing when Chon Aike Province volcanism started. The Early Jurassic plutonism on the Antarctic Peninsula is transitional between subduction-related and breakup-related magmatism. |
format |
Article in Journal/Newspaper |
author |
Riley, Teal R. Flowerdew, Michael J. Pankhurst, Robert J. Curtis, Mike L. Millar, Ian L. Fanning, C. Mark Whitehouse, Martin J. |
spellingShingle |
Riley, Teal R. Flowerdew, Michael J. Pankhurst, Robert J. Curtis, Mike L. Millar, Ian L. Fanning, C. Mark Whitehouse, Martin J. Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia |
author_facet |
Riley, Teal R. Flowerdew, Michael J. Pankhurst, Robert J. Curtis, Mike L. Millar, Ian L. Fanning, C. Mark Whitehouse, Martin J. |
author_sort |
Riley, Teal R. |
title |
Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia |
title_short |
Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia |
title_full |
Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia |
title_fullStr |
Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia |
title_full_unstemmed |
Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia |
title_sort |
early jurassic magmatism on the antarctic peninsula and potential correlation with the subcordilleran plutonic belt of patagonia |
publisher |
Geological Society of London |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/513439/ https://nora.nerc.ac.uk/id/eprint/513439/1/Riley%20et%20al.%20JGSL.pdf http://jgs.lyellcollection.org/content/early/2016/10/20/jgs2016-053.abstract |
geographic |
Antarctic The Antarctic Antarctic Peninsula Patagonia Pacific |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Patagonia Pacific |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
https://nora.nerc.ac.uk/id/eprint/513439/1/Riley%20et%20al.%20JGSL.pdf Riley, Teal R. orcid:0000-0002-3333-5021 Flowerdew, Michael J.; Pankhurst, Robert J.; Curtis, Mike L.; Millar, Ian L.; Fanning, C. Mark; Whitehouse, Martin J. 2017 Early Jurassic magmatism on the Antarctic Peninsula and potential correlation with the Subcordilleran plutonic belt of Patagonia. Journal of the Geological Society, 174 (2). 365-376. https://doi.org/10.1144/jgs2016-053 <https://doi.org/10.1144/jgs2016-053> |
op_doi |
https://doi.org/10.1144/jgs2016-053 |
container_title |
Journal of the Geological Society |
container_volume |
174 |
container_issue |
2 |
container_start_page |
365 |
op_container_end_page |
376 |
_version_ |
1788690903957766144 |