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U-Pb geochronology and tectonic implications of a Silurian ash in the Farewell Terrane, Alaska

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Bradley, D.C., Dumoulin, J.A., and Bradley, D.B., 2018, U-Pb geochronology and tectonic implications of a Silurian ash in the Farewell terrane, Alaska, <i>in</i> Dumoulin, J.A., ed., Studies by the U.S. Geological Survey in Alaska, vol. 15: U.S. Geological Survey Professional Paper 1814–F, 13 p., https://doi.org/10.3133/pp1814F.

Summary

The Farewell terrane is an exotic continental fragment in interior Alaska that during the early Paleozoic was the site of a passive margin. We report a 238U/206Pb zircon age of 432.9±3.0 Ma from a Farewell terrane ash in Mt. McKinley quadrangle, Alaska. This age overlaps with prominent detrital zircon age maxima reported from Silurian and Devonian strata from the Farewell, Arctic Alaska-Chukotka, White Mountains, Alexander, and Yreka terranes, and from parautochtonous Silurian and Devonian foreland-basin strata along the Laurentian margin in the Canadian Arctic and Alaska. These findings can be explained in terms of refinements to the extrusion model of Colpron and Nelson (2011). In the original model, the Farewell terrane was interpreted [...]

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Type Scheme Key
local-index unknown pp1814F
local-pk unknown 70200851
doi http://www.loc.gov/standards/mods/mods-outline-3-5.html#identifier doi:10.3133/pp1814F
series unknown Professional Paper

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citationTypeReport
journalProfessional Paper
languageEnglish
parts
typePublication Place
valueReston, VA
tableOfContents<ul><li>Abstract</li><li>Introduction</li><li>Geologic Setting</li><li>U-Pb Geochronology</li><li>Discussion</li><li>Acknowledgments</li><li>References Cited</li></ul>

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