Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction
Apatite (U-Th)/He and apatite fission track thermochronology is used to constrain the cooling and uplift history of the southern Antarctic Peninsula where easterly-directed subduction of the Phoenix Plate, including ridge-trench collisions have been taking place along its western margin since the Up...
Published in: | Journal of the Geological Society |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The Geological Society of London
2022
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/531794/ https://nora.nerc.ac.uk/id/eprint/531794/1/jgs2022-008.pdf https://www.lyellcollection.org/doi/10.1144/jgs2022-008 |
id |
ftnerc:oai:nora.nerc.ac.uk:531794 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:531794 2023-05-15T13:15:16+02:00 Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction Twinn, G. Riley, T. Fox, M. Carter, A. 2022-11-04 text http://nora.nerc.ac.uk/id/eprint/531794/ https://nora.nerc.ac.uk/id/eprint/531794/1/jgs2022-008.pdf https://www.lyellcollection.org/doi/10.1144/jgs2022-008 en eng The Geological Society of London https://nora.nerc.ac.uk/id/eprint/531794/1/jgs2022-008.pdf Twinn, G.; Riley, T. orcid:0000-0002-3333-5021 Fox, M.; Carter, A. 2022 Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction. Journal of the Geological Society, 179 (6:4). 11, pp. https://doi.org/10.1144/jgs2022-008 <https://doi.org/10.1144/jgs2022-008> cc_by_4 CC-BY Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.1144/jgs2022-008 2023-02-04T19:52:55Z Apatite (U-Th)/He and apatite fission track thermochronology is used to constrain the cooling and uplift history of the southern Antarctic Peninsula where easterly-directed subduction of the Phoenix Plate, including ridge-trench collisions have been taking place along its western margin since the Upper Cretaceous. Apatite ages and thermal history models are similar on eastern Palmer Land but are younger and vary across westernmost Palmer Land and Alexander Island. Transformation of thermal history models to a single plot show how cooling rates varied as a function of distance from the trench zone. Eastern Palmer Land preserves a record of uplift during the Upper Cretaceous that coincides with changes in Phoenix Plate convergence rates and direction. By contrast western Palmer Land and Alexander Island experienced a period of increased rates of cooling between c. 25-15 Ma. This younger phase of exhumation is bounded by major fault zones related to the extension and rifting that formed the present-day George VI Sound. It was likely triggered by cessation of subduction due to trench collision of a ridge segment NE of the Heezen fracture zone. No evidence was found for slab window influences as seen along the northernmost part of the Antarctic Peninsula. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula Palmer Land Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) George VI Sound ENVELOPE(-68.000,-68.000,-71.000,-71.000) Journal of the Geological Society 179 6 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Apatite (U-Th)/He and apatite fission track thermochronology is used to constrain the cooling and uplift history of the southern Antarctic Peninsula where easterly-directed subduction of the Phoenix Plate, including ridge-trench collisions have been taking place along its western margin since the Upper Cretaceous. Apatite ages and thermal history models are similar on eastern Palmer Land but are younger and vary across westernmost Palmer Land and Alexander Island. Transformation of thermal history models to a single plot show how cooling rates varied as a function of distance from the trench zone. Eastern Palmer Land preserves a record of uplift during the Upper Cretaceous that coincides with changes in Phoenix Plate convergence rates and direction. By contrast western Palmer Land and Alexander Island experienced a period of increased rates of cooling between c. 25-15 Ma. This younger phase of exhumation is bounded by major fault zones related to the extension and rifting that formed the present-day George VI Sound. It was likely triggered by cessation of subduction due to trench collision of a ridge segment NE of the Heezen fracture zone. No evidence was found for slab window influences as seen along the northernmost part of the Antarctic Peninsula. |
format |
Article in Journal/Newspaper |
author |
Twinn, G. Riley, T. Fox, M. Carter, A. |
spellingShingle |
Twinn, G. Riley, T. Fox, M. Carter, A. Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction |
author_facet |
Twinn, G. Riley, T. Fox, M. Carter, A. |
author_sort |
Twinn, G. |
title |
Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction |
title_short |
Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction |
title_full |
Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction |
title_fullStr |
Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction |
title_full_unstemmed |
Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction |
title_sort |
thermal history of the southern antarctic peninsula during cenozoic oblique subduction |
publisher |
The Geological Society of London |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/531794/ https://nora.nerc.ac.uk/id/eprint/531794/1/jgs2022-008.pdf https://www.lyellcollection.org/doi/10.1144/jgs2022-008 |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-65.000,-65.000,-71.500,-71.500) ENVELOPE(-68.000,-68.000,-71.000,-71.000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Alexander Island Palmer Land George VI Sound |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Alexander Island Palmer Land George VI Sound |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula Palmer Land |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula Palmer Land |
op_relation |
https://nora.nerc.ac.uk/id/eprint/531794/1/jgs2022-008.pdf Twinn, G.; Riley, T. orcid:0000-0002-3333-5021 Fox, M.; Carter, A. 2022 Thermal history of the southern Antarctic Peninsula during Cenozoic oblique subduction. Journal of the Geological Society, 179 (6:4). 11, pp. https://doi.org/10.1144/jgs2022-008 <https://doi.org/10.1144/jgs2022-008> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1144/jgs2022-008 |
container_title |
Journal of the Geological Society |
container_volume |
179 |
container_issue |
6 |
_version_ |
1766267813501075456 |