U–Pb zircon geochronology of Cretaceous arc magmatism in eastern Chukotka, NE Russia, with implications for Pacific plate subduction and the opening of the Amerasia Basin
The tectonomagmatic evolution of eastern Chukotka, NE Russia, is important for refining the onset of Pacific plate subduction, understanding the development of the Amerasia Basin, and constraining Arctic tectonic reconstructions. Field mapping and strategic sample collection provide relative age con...
Published in: | Geological Society, London, Special Publications |
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Stockholms universitet, Institutionen för geologiska vetenskaper
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ftstockholmuniv:oai:DiVA.org:su-157562 2023-05-15T15:08:46+02:00 U–Pb zircon geochronology of Cretaceous arc magmatism in eastern Chukotka, NE Russia, with implications for Pacific plate subduction and the opening of the Amerasia Basin Pease, Victoria Miller, Elizabeth Wyld, Sandra J. Sokolov, Serey Akinin, Viacheslav Wright, James E. 2018 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-157562 https://doi.org/10.1144/SP460.14 eng eng Stockholms universitet, Institutionen för geologiska vetenskaper Geological Society Special Publication, 0305-8719, 2018, 460:1, orcid:0000-0003-0498-1849 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-157562 doi:10.1144/SP460.14 info:eu-repo/semantics/openAccess Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Article in journal info:eu-repo/semantics/article text 2018 ftstockholmuniv https://doi.org/10.1144/SP460.14 2023-02-23T21:43:18Z The tectonomagmatic evolution of eastern Chukotka, NE Russia, is important for refining the onset of Pacific plate subduction, understanding the development of the Amerasia Basin, and constraining Arctic tectonic reconstructions. Field mapping and strategic sample collection provide relative age constraints on subduction-related continental arc magmatism in eastern Chukotka. Ion microprobe U–Pb zircon ages provide absolute constraints and identify five magmatic episodes (c. 134, 122, 105, 94 and 85 Ma) separated by three periods of uplift and erosion (c. 122–105, 94–85 and post-85 Ma). Volcanic rocks in the region are less contaminated than their plutonic equivalents which record greater crustal assimilation. These data, combined with xenocrystic zircons, reflect the self-assimilation of a continental arc during its evolution. Proto-Pacific subduction initiated by c. 121 Ma and arc development occurred over c. 35–50 myr. Crustal growth was simultaneous with regional exhumation and crustal thinning across the Bering Strait region. Ocean–continent subduction in eastern Chukotka ended at c. 85 Ma. The timing of events in the region is roughly synchronous with the inferred opening of the Amerasia Basin. Simultaneous arc magmatism, extension and development of the Amerasia Basin within a back-arc basin setting best explain these coeval tectonic events. Article in Journal/Newspaper Arctic Bering Strait Chukotka Stockholm University: Publications (DiVA) Amerasia Basin ENVELOPE(-170.000,-170.000,80.000,80.000) Arctic Bering Strait Pacific Geological Society, London, Special Publications 460 1 159 182 |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Pease, Victoria Miller, Elizabeth Wyld, Sandra J. Sokolov, Serey Akinin, Viacheslav Wright, James E. U–Pb zircon geochronology of Cretaceous arc magmatism in eastern Chukotka, NE Russia, with implications for Pacific plate subduction and the opening of the Amerasia Basin |
topic_facet |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
description |
The tectonomagmatic evolution of eastern Chukotka, NE Russia, is important for refining the onset of Pacific plate subduction, understanding the development of the Amerasia Basin, and constraining Arctic tectonic reconstructions. Field mapping and strategic sample collection provide relative age constraints on subduction-related continental arc magmatism in eastern Chukotka. Ion microprobe U–Pb zircon ages provide absolute constraints and identify five magmatic episodes (c. 134, 122, 105, 94 and 85 Ma) separated by three periods of uplift and erosion (c. 122–105, 94–85 and post-85 Ma). Volcanic rocks in the region are less contaminated than their plutonic equivalents which record greater crustal assimilation. These data, combined with xenocrystic zircons, reflect the self-assimilation of a continental arc during its evolution. Proto-Pacific subduction initiated by c. 121 Ma and arc development occurred over c. 35–50 myr. Crustal growth was simultaneous with regional exhumation and crustal thinning across the Bering Strait region. Ocean–continent subduction in eastern Chukotka ended at c. 85 Ma. The timing of events in the region is roughly synchronous with the inferred opening of the Amerasia Basin. Simultaneous arc magmatism, extension and development of the Amerasia Basin within a back-arc basin setting best explain these coeval tectonic events. |
format |
Article in Journal/Newspaper |
author |
Pease, Victoria Miller, Elizabeth Wyld, Sandra J. Sokolov, Serey Akinin, Viacheslav Wright, James E. |
author_facet |
Pease, Victoria Miller, Elizabeth Wyld, Sandra J. Sokolov, Serey Akinin, Viacheslav Wright, James E. |
author_sort |
Pease, Victoria |
title |
U–Pb zircon geochronology of Cretaceous arc magmatism in eastern Chukotka, NE Russia, with implications for Pacific plate subduction and the opening of the Amerasia Basin |
title_short |
U–Pb zircon geochronology of Cretaceous arc magmatism in eastern Chukotka, NE Russia, with implications for Pacific plate subduction and the opening of the Amerasia Basin |
title_full |
U–Pb zircon geochronology of Cretaceous arc magmatism in eastern Chukotka, NE Russia, with implications for Pacific plate subduction and the opening of the Amerasia Basin |
title_fullStr |
U–Pb zircon geochronology of Cretaceous arc magmatism in eastern Chukotka, NE Russia, with implications for Pacific plate subduction and the opening of the Amerasia Basin |
title_full_unstemmed |
U–Pb zircon geochronology of Cretaceous arc magmatism in eastern Chukotka, NE Russia, with implications for Pacific plate subduction and the opening of the Amerasia Basin |
title_sort |
u–pb zircon geochronology of cretaceous arc magmatism in eastern chukotka, ne russia, with implications for pacific plate subduction and the opening of the amerasia basin |
publisher |
Stockholms universitet, Institutionen för geologiska vetenskaper |
publishDate |
2018 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-157562 https://doi.org/10.1144/SP460.14 |
long_lat |
ENVELOPE(-170.000,-170.000,80.000,80.000) |
geographic |
Amerasia Basin Arctic Bering Strait Pacific |
geographic_facet |
Amerasia Basin Arctic Bering Strait Pacific |
genre |
Arctic Bering Strait Chukotka |
genre_facet |
Arctic Bering Strait Chukotka |
op_relation |
Geological Society Special Publication, 0305-8719, 2018, 460:1, orcid:0000-0003-0498-1849 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-157562 doi:10.1144/SP460.14 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1144/SP460.14 |
container_title |
Geological Society, London, Special Publications |
container_volume |
460 |
container_issue |
1 |
container_start_page |
159 |
op_container_end_page |
182 |
_version_ |
1766340070575439872 |