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Detrital zircon U-Pb geochronology and Hf isotope geochemistry of metasedimentary strata in the southern Brooks Range; constraints on Neoproterozoic-Cretaceous evolution of Arctic Alaska

Carl W. Hoiland, Elizabeth L. Miller, Victoria Pease and Jeremy K. Hourigan
Detrital zircon U-Pb geochronology and Hf isotope geochemistry of metasedimentary strata in the southern Brooks Range; constraints on Neoproterozoic-Cretaceous evolution of Arctic Alaska (in Circum-Arctic lithosphere evolution, Victoria Pease (editor) and B. Coakley (editor))
Special Publication - Geological Society of London (June 2017) 460 (1): 121-158

Abstract

Mid-Palaeozoic assembly models for the Arctic Alaska-Chukotka microplate predict the presence of cryptic crustal sutures, the exact locations and deformational histories of which have not been identified in the field. This study presents data on the provenance of polydeformed and metamorphosed strata in the southern Brooks Range Schist Belt and Central Belt of presumed Proterozoic-Devonian depositional age, as well as for the structurally overlying strata, to help elucidate terrane boundaries within the Arctic Alaska-Chukotka microplate and to add new constraints to the palaeogeographical evolution of its constituent parts. The protoliths identified support correlations with metasedimentary strata in the Ruby terrane and Seward Peninsula and suggest a (peri-) Baltican origin in late Neoproterozoic-early Palaeozoic time. Proximity to Laurentia is only evident in what are inferred to be post-early Devonian age strata. By contrast, the North Slope and Apoon terranes originated proximal to Laurentia. The mid-Palaeozoic boundary between these (peri-) Baltican and (peri-) Laurentian terranes once lay between rocks of the Schist/Central belts and those of the Apoon terrane, but is obscured by severe Mesozoic-Cenozoic deformation. Whether this boundary represents a convergent or transform suture, when exactly it formed and how it relates to broader Caledonian convergence in the North Atlantic are still unresolved questions. Supplementary material: Details of the analytical methods together with zircon U-Pb and Lu-Hf isotopic data tables are available at https://doi.org/10.6084/m9.figshare.c.3805696


ISSN: 0305-8719
EISSN: 2041-4927
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 460
Serial Issue: 1
Title: Detrital zircon U-Pb geochronology and Hf isotope geochemistry of metasedimentary strata in the southern Brooks Range; constraints on Neoproterozoic-Cretaceous evolution of Arctic Alaska
Title: Circum-Arctic lithosphere evolution
Author(s): Hoiland, Carl W.Miller, Elizabeth L.Pease, VictoriaHourigan, Jeremy K.
Author(s): Pease, Victoriaeditor
Author(s): Coakley, B.editor
Affiliation: Stanford University, Department of Geological Sciences, Stanford, CA, United States
Pages: 121-158
Published: 20170622
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 223
Accession Number: 2017-076059
Categories: GeochronologySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., 1 table, geol. sketch maps
N67°00'00" - N68°00'00", W153°00'00" - W150°00'00"
N67°00'00" - N68°00'00", W158°00'00" - W155°00'00"
Secondary Affiliation: Stockholm University, SWE, SwedenUniversity of California at Santa Cruz, USA, United States
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201740
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