Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin
Long-lived continental margin arcs are characterized by episodes of large-volume magmatism (or flare-ups) that can persist for ∼30 m.y. before steady-state arc conditions resume. Flare-up events are characterized by the emplacement of large-volume granodiorite-tonalite batholiths and sometimes assoc...
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Language: | English |
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Geological Society of America
2018
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Online Access: | http://nora.nerc.ac.uk/id/eprint/516492/ https://nora.nerc.ac.uk/id/eprint/516492/1/Riley%20et%20al%20%20final.docx https://pubs.geoscienceworld.org/gsa/gsabulletin/article/526245/episodicity-within-a-mid-cretaceous-magmatic-flare |
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ftnerc:oai:nora.nerc.ac.uk:516492 2023-05-15T13:49:33+02:00 Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin Riley, Teal R. Burton-Johnson, Alex Flowerdew, Michael J. Whitehouse, Martin J. 2018-07 text http://nora.nerc.ac.uk/id/eprint/516492/ https://nora.nerc.ac.uk/id/eprint/516492/1/Riley%20et%20al%20%20final.docx https://pubs.geoscienceworld.org/gsa/gsabulletin/article/526245/episodicity-within-a-mid-cretaceous-magmatic-flare en eng Geological Society of America https://nora.nerc.ac.uk/id/eprint/516492/1/Riley%20et%20al%20%20final.docx Riley, Teal R. orcid:0000-0002-3333-5021 Burton-Johnson, Alex orcid:0000-0003-2208-0075 Flowerdew, Michael J.; Whitehouse, Martin J. 2018 Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin. Geological Society of America Bulletin, 130 (7-8). 1177-1196. https://doi.org/10.1130/B31800.1 <https://doi.org/10.1130/B31800.1> Publication - Article PeerReviewed 2018 ftnerc https://doi.org/10.1130/B31800.1 2023-02-04T19:44:39Z Long-lived continental margin arcs are characterized by episodes of large-volume magmatism (or flare-ups) that can persist for ∼30 m.y. before steady-state arc conditions resume. Flare-up events are characterized by the emplacement of large-volume granodiorite-tonalite batholiths and sometimes associated rhyodacitic ignimbrites. One of the major flare-up events of the West Gondwana margin occurred during the mid-Cretaceous and was temporally and spatially associated with widespread deformation and Pacific plate reorganization. New U-Pb geochronology from the Lassiter Coast intrusive suite in the southern Antarctic Peninsula identifies a major magmatic event in the interval 130−102 Ma that was characterized by three distinct peaks in granitoid emplacement at 130−126 Ma, 118−113 Ma, and 108−102 Ma, with clear lulls in between. Mid-Cretaceous magmatism from elsewhere in West Antarctica, Patagonia, and New Zealand also featured marked episodicity during the mid-Cretaceous and recorded remarkable continuity along the West Gondwana margin. The three distinct magmatic events represent second-order episodicity relative to the primary episodicity that occurred on a cordillera scale and is a feature of the North and South American Pacific margin. Flare-up events require the development of a highly fusible, lower-crustal layer resulting from the continued underplating of hydrous mineralogies in the melt-fertile lower crust as a result of long-lived subduction. However, the actual trigger for melting is likely to result from external, potentially tectonic factors, e.g., rifting, plate reorganization, continental breakup, or mantle plumes. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Patagonia West Antarctica Pacific New Zealand Lassiter ENVELOPE(-62.000,-62.000,-73.750,-73.750) Lassiter Coast ENVELOPE(-62.000,-62.000,-74.000,-74.000) GSA Bulletin 130 7-8 1177 1196 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Long-lived continental margin arcs are characterized by episodes of large-volume magmatism (or flare-ups) that can persist for ∼30 m.y. before steady-state arc conditions resume. Flare-up events are characterized by the emplacement of large-volume granodiorite-tonalite batholiths and sometimes associated rhyodacitic ignimbrites. One of the major flare-up events of the West Gondwana margin occurred during the mid-Cretaceous and was temporally and spatially associated with widespread deformation and Pacific plate reorganization. New U-Pb geochronology from the Lassiter Coast intrusive suite in the southern Antarctic Peninsula identifies a major magmatic event in the interval 130−102 Ma that was characterized by three distinct peaks in granitoid emplacement at 130−126 Ma, 118−113 Ma, and 108−102 Ma, with clear lulls in between. Mid-Cretaceous magmatism from elsewhere in West Antarctica, Patagonia, and New Zealand also featured marked episodicity during the mid-Cretaceous and recorded remarkable continuity along the West Gondwana margin. The three distinct magmatic events represent second-order episodicity relative to the primary episodicity that occurred on a cordillera scale and is a feature of the North and South American Pacific margin. Flare-up events require the development of a highly fusible, lower-crustal layer resulting from the continued underplating of hydrous mineralogies in the melt-fertile lower crust as a result of long-lived subduction. However, the actual trigger for melting is likely to result from external, potentially tectonic factors, e.g., rifting, plate reorganization, continental breakup, or mantle plumes. |
format |
Article in Journal/Newspaper |
author |
Riley, Teal R. Burton-Johnson, Alex Flowerdew, Michael J. Whitehouse, Martin J. |
spellingShingle |
Riley, Teal R. Burton-Johnson, Alex Flowerdew, Michael J. Whitehouse, Martin J. Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin |
author_facet |
Riley, Teal R. Burton-Johnson, Alex Flowerdew, Michael J. Whitehouse, Martin J. |
author_sort |
Riley, Teal R. |
title |
Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin |
title_short |
Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin |
title_full |
Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin |
title_fullStr |
Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin |
title_full_unstemmed |
Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin |
title_sort |
episodicity within a mid-cretaceous magmatic flare-up in west antarctica: u-pb ages of the lassiter coast intrusive suite, antarctic peninsula and correlations along the gondwana margin |
publisher |
Geological Society of America |
publishDate |
2018 |
url |
http://nora.nerc.ac.uk/id/eprint/516492/ https://nora.nerc.ac.uk/id/eprint/516492/1/Riley%20et%20al%20%20final.docx https://pubs.geoscienceworld.org/gsa/gsabulletin/article/526245/episodicity-within-a-mid-cretaceous-magmatic-flare |
long_lat |
ENVELOPE(-62.000,-62.000,-73.750,-73.750) ENVELOPE(-62.000,-62.000,-74.000,-74.000) |
geographic |
Antarctic Antarctic Peninsula Patagonia West Antarctica Pacific New Zealand Lassiter Lassiter Coast |
geographic_facet |
Antarctic Antarctic Peninsula Patagonia West Antarctica Pacific New Zealand Lassiter Lassiter Coast |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/516492/1/Riley%20et%20al%20%20final.docx Riley, Teal R. orcid:0000-0002-3333-5021 Burton-Johnson, Alex orcid:0000-0003-2208-0075 Flowerdew, Michael J.; Whitehouse, Martin J. 2018 Episodicity within a mid-Cretaceous magmatic flare-up in West Antarctica: U-Pb ages of the Lassiter Coast intrusive suite, Antarctic Peninsula and correlations along the Gondwana margin. Geological Society of America Bulletin, 130 (7-8). 1177-1196. https://doi.org/10.1130/B31800.1 <https://doi.org/10.1130/B31800.1> |
op_doi |
https://doi.org/10.1130/B31800.1 |
container_title |
GSA Bulletin |
container_volume |
130 |
container_issue |
7-8 |
container_start_page |
1177 |
op_container_end_page |
1196 |
_version_ |
1766251647751684096 |