Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula
The LeMay Group accretionary complex of Alexander Island (Antarctic Peninsula) comprises a 4 km thick succession of variably deformed turbidites associated with thrust slices of ocean floor basalts. The depositional age and provenance of the succession is uncertain with estimates ranging from Carbon...
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Language: | English |
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American Geophysical Union
2023
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ftnerc:oai:nora.nerc.ac.uk:533168 2023-05-15T13:15:15+02:00 Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula Riley, Teal R. Millar, Ian L. Carter, Andrew Flowerdew, Michael J. Burton-Johnson, Alex Bastias, Joaquin Storey, Craig D. Castillo, Paula Chew, David Whitehouse, Martin J. 2023-02-11 text http://nora.nerc.ac.uk/id/eprint/533168/ https://nora.nerc.ac.uk/id/eprint/533168/1/Tectonics%20-%202023%20-%20Riley%20-%20Evolution%20of%20an%20Accretionary%20Complex%20%20LeMay%20Group%20%20and%20Terrane%20Translation%20in%20the%20Antarctic.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022TC007578 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/533168/1/Tectonics%20-%202023%20-%20Riley%20-%20Evolution%20of%20an%20Accretionary%20Complex%20%20LeMay%20Group%20%20and%20Terrane%20Translation%20in%20the%20Antarctic.pdf Riley, Teal R. orcid:0000-0002-3333-5021 Millar, Ian L.; Carter, Andrew; Flowerdew, Michael J.; Burton-Johnson, Alex orcid:0000-0003-2208-0075 Bastias, Joaquin; Storey, Craig D.; Castillo, Paula; Chew, David; Whitehouse, Martin J. 2023 Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula. Tectonics, 42 (2), e2022TC007578. 30, pp. https://doi.org/10.1029/2022TC007578 <https://doi.org/10.1029/2022TC007578> cc_by_4 CC-BY Publication - Article PeerReviewed 2023 ftnerc https://doi.org/10.1029/2022TC007578 2023-02-17T00:02:00Z The LeMay Group accretionary complex of Alexander Island (Antarctic Peninsula) comprises a 4 km thick succession of variably deformed turbidites associated with thrust slices of ocean floor basalts. The depositional age and provenance of the succession is uncertain with estimates ranging from Carboniferous to Cretaceous. The accretion history is also poorly established and whether the LeMay Group developed allochthonously and accreted during an episode of Cretaceous terrane translation. We have examined the geochronology and geochemistry of twenty-two samples from across the entire accretionary complex to determine its depositional, provenance and accretion history. The accretionary complex has been subdivided into four separate groups based on detrital zircon U-Pb age and Lu-Hf provenance analysis. Groups 1 and 2 are interpreted to be a continuation of the extensive Permian accretionary complexes of West Gondwana and have a depositional age of c. 255 Ma, with volcaniclastic input from the extensive silicic volcanism of the Choiyoi Province. Accretion of the LeMay Group to the continental margin developed during the mid-Triassic, potentially related to the Peninsula Orogeny and an episode of flat-slab subduction of the proto-Pacific plate. Group 3 is only identified from an island to the west of Alexander Island and has a mid-Cretaceous depositional age and provenance akin to offshore sequences from Thurston Island. A para-autochthonous origin is suggested, with mid-Cretaceous accretion associated with the melange belts of central Alexander Island. Group 4 is also a distinct unit with an Early Jurassic depositional age and a source more closely related to the Antarctic Peninsula. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula Thurston Island Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Pacific Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Thurston ENVELOPE(-97.500,-97.500,-71.833,-71.833) Thurston Island ENVELOPE(-99.000,-99.000,-72.167,-72.167) Tectonics 42 2 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The LeMay Group accretionary complex of Alexander Island (Antarctic Peninsula) comprises a 4 km thick succession of variably deformed turbidites associated with thrust slices of ocean floor basalts. The depositional age and provenance of the succession is uncertain with estimates ranging from Carboniferous to Cretaceous. The accretion history is also poorly established and whether the LeMay Group developed allochthonously and accreted during an episode of Cretaceous terrane translation. We have examined the geochronology and geochemistry of twenty-two samples from across the entire accretionary complex to determine its depositional, provenance and accretion history. The accretionary complex has been subdivided into four separate groups based on detrital zircon U-Pb age and Lu-Hf provenance analysis. Groups 1 and 2 are interpreted to be a continuation of the extensive Permian accretionary complexes of West Gondwana and have a depositional age of c. 255 Ma, with volcaniclastic input from the extensive silicic volcanism of the Choiyoi Province. Accretion of the LeMay Group to the continental margin developed during the mid-Triassic, potentially related to the Peninsula Orogeny and an episode of flat-slab subduction of the proto-Pacific plate. Group 3 is only identified from an island to the west of Alexander Island and has a mid-Cretaceous depositional age and provenance akin to offshore sequences from Thurston Island. A para-autochthonous origin is suggested, with mid-Cretaceous accretion associated with the melange belts of central Alexander Island. Group 4 is also a distinct unit with an Early Jurassic depositional age and a source more closely related to the Antarctic Peninsula. |
format |
Article in Journal/Newspaper |
author |
Riley, Teal R. Millar, Ian L. Carter, Andrew Flowerdew, Michael J. Burton-Johnson, Alex Bastias, Joaquin Storey, Craig D. Castillo, Paula Chew, David Whitehouse, Martin J. |
spellingShingle |
Riley, Teal R. Millar, Ian L. Carter, Andrew Flowerdew, Michael J. Burton-Johnson, Alex Bastias, Joaquin Storey, Craig D. Castillo, Paula Chew, David Whitehouse, Martin J. Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula |
author_facet |
Riley, Teal R. Millar, Ian L. Carter, Andrew Flowerdew, Michael J. Burton-Johnson, Alex Bastias, Joaquin Storey, Craig D. Castillo, Paula Chew, David Whitehouse, Martin J. |
author_sort |
Riley, Teal R. |
title |
Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula |
title_short |
Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula |
title_full |
Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula |
title_fullStr |
Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula |
title_full_unstemmed |
Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula |
title_sort |
evolution of an accretionary complex (lemay group) and terrane translation in the antarctic peninsula |
publisher |
American Geophysical Union |
publishDate |
2023 |
url |
http://nora.nerc.ac.uk/id/eprint/533168/ https://nora.nerc.ac.uk/id/eprint/533168/1/Tectonics%20-%202023%20-%20Riley%20-%20Evolution%20of%20an%20Accretionary%20Complex%20%20LeMay%20Group%20%20and%20Terrane%20Translation%20in%20the%20Antarctic.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022TC007578 |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-97.500,-97.500,-71.833,-71.833) ENVELOPE(-99.000,-99.000,-72.167,-72.167) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Pacific Alexander Island Thurston Thurston Island |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Pacific Alexander Island Thurston Thurston Island |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula Thurston Island |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula Thurston Island |
op_relation |
https://nora.nerc.ac.uk/id/eprint/533168/1/Tectonics%20-%202023%20-%20Riley%20-%20Evolution%20of%20an%20Accretionary%20Complex%20%20LeMay%20Group%20%20and%20Terrane%20Translation%20in%20the%20Antarctic.pdf Riley, Teal R. orcid:0000-0002-3333-5021 Millar, Ian L.; Carter, Andrew; Flowerdew, Michael J.; Burton-Johnson, Alex orcid:0000-0003-2208-0075 Bastias, Joaquin; Storey, Craig D.; Castillo, Paula; Chew, David; Whitehouse, Martin J. 2023 Evolution of an accretionary complex (LeMay Group) and terrane translation in the Antarctic Peninsula. Tectonics, 42 (2), e2022TC007578. 30, pp. https://doi.org/10.1029/2022TC007578 <https://doi.org/10.1029/2022TC007578> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2022TC007578 |
container_title |
Tectonics |
container_volume |
42 |
container_issue |
2 |
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1766267739270283264 |