Item talk:Q299781
From geokb
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"@type": "Article",
"additionalType": "Journal Article",
"name": "Detrital zircon ages from upper Paleozoic\u2013Triassic clastic strata on St. Lawrence Island, Alaska: An enigmatic component of the Arctic Alaska\u2013Chukotka microplate",
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"value": "10.1130/GES02490.1",
"url": "https://doi.org/10.1130/GES02490.1"
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"journal": {
"@type": "Periodical",
"name": "Geosphere",
"volumeNumber": "18",
"issueNumber": "5"
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"datePublished": "2022",
"dateModified": "2022-10-18",
"abstract": "New lithologic and detrital zircon (DZ) U-Pb data from Devonian\u2013Triassic strata on St. Lawrence Island in the Bering Sea and from the western Brooks Range of Alaska suggest affinities between these two areas. The Brooks Range constitutes part of the Arctic Alaska\u2013Chukotka microplate, but the tectonic and paleogeographic affinities of St. Lawrence Island are unknown or at best speculative. Strata on St. Lawrence Island form a Devonian\u2013Triassic carbonate succession and a Mississippian(?)\u2013Triassic clastic succession that are subdivided according to three distinctive DZ age distributions. The Devonian\u2013Triassic carbonate succession has Mississippian-age quartz arenite beds with Silurian, Cambrian, Neoproterozoic, and Mesoproterozoic DZ age modes, and it exhibits similar age distributions and lithologic and biostratigraphic characteristics as Mississippian-age Utukok Formation strata in the Kelly River allochthon of the western Brooks Range. Consistent late Neoproterozoic, Cambrian, and Silurian ages in each of the Mississippian-age units suggest efficient mixing of the DZ prior to deposition, and derivation from strata exposed by the pre-Mississippian unconformity and/or Endicott Group strata that postdate the unconformity. The Mississippian(?)\u2013Triassic clastic succession is subdivided into feldspathic and graywacke subunits. The feldspathic subunit has a unimodal DZ age mode at 2.06 Ga, identical to Nuka Formation strata in the Nuka Ridge allochthon of the western Brooks Range, and it records a distinctive depositional episode related to late Paleozoic juxtaposition of a Paleoproterozoic terrane along the most distal parts of the Arctic Alaska\u2013Chukotka microplate. The graywacke subunit has Triassic maximum depositional ages and abundant late Paleozoic grains, likely sourced from fringing arcs and/or continent-scale paleorivers draining Eurasia, and it has similar age distributions to Triassic strata from the Lisburne Peninsula (northwestern Alaska), Chukotka and Wrangel Island (eastern Russia), and the northern Sverdrup Basin (Canadian Arctic), but, unlike the Devonian\u2013Triassic carbonate succession and feldspathic subunit of the Mississippian(?)\u2013Triassic clastic succession, it has no obvious analogue in the western Brooks Range allochthon stack. These correlations establish St. Lawrence Island as conclusively belonging to the Arctic Alaska\u2013Chukotka microplate, thus enhancing our understanding of the circum-Arctic region in late Paleozoic\u2013Triassic time.",
"description": "32 p.",
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"name": "Geological Society of America"
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"author": [
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"name": "Amato, Jeffrey M.",
"givenName": "Jeffrey M.",
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"name": "Dept of Geolgical Sciences, New Mexico State University"
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"name": "Dumoulin, Julie A. dumoulin@usgs.gov",
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"name": "Alaska Science Center Geology Minerals",
"url": "https://www.usgs.gov/centers/alaska-science-center"
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