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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
Stockholm University, Faculty of Science, Department of Geological Sciences.ORCID iD: 0000-0003-0498-1849
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2018 (English)In: Geological Society Special Publication, ISSN 0305-8719, E-ISSN 2041-4927, Vol. 460, no 1, article id 159Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2018. Vol. 460, no 1, article id 159
National Category
Natural Sciences
Research subject
Geology
Identifiers
URN: urn:nbn:se:su:diva-157562DOI: 10.1144/SP460.14OAI: oai:DiVA.org:su-157562DiVA, id: diva2:1222601
Available from: 2018-06-21 Created: 2018-06-21 Last updated: 2018-06-27Bibliographically approved

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