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Samples yielding ~40 Ma AFT ages and mean confined track lengths > 14 \u00b5m with low standard deviations cooled rapidly from >120\u00b0C to <50\u00b0C during a 3\u00965 Ma period, beginning at about 40 Ma. Data from samples yielding AFT ages >40 Ma suggest partial annealing and, therefore, lower maximum temperatures (~90\u0096105\u00b0C). A few samples with single-grain ages of ~20 Ma apparently remained above ~50\u00b0C after initial cooling. Although the present geothermal gradient in the western Yukon\u0096Tanana Upland is ~32\u00b0C/km, it could have been as high as 45\u00b0C/km during a widespread Eocene intraplate magmatic episode. Prior to rapid exhumation, samples with ~40 Ma AFT ages were >3.8\u00962.7 km deep and samples with >50 Ma AFT ages were >3.3\u00962.0 km deep. We calculate a 440\u0096320 m/Ma minimum rate for exhumation of all samples during rapid cooling. Our AFT data, and data from rocks north of Fairbanks and from the Eielson deep test hole, indicate up to 3 km of post-40 Ma vertical displacement along known and inferred northeast-trending high-angle faults. The predominance of 40\u009650 Ma AFT ages throughout the Yukon\u0096Tanana Upland indicates that, prior to the post-40 Ma relative uplift along some northeast-trending faults, rapid regional cooling and exhumation closely followed the Eocene extensional magmatism. We propose that Eocene magmatism and exhumation were somehow related to plate movements that produced regional-scale oroclinal rotation, northward translation of outboard terranes, major dextral strike-slip faulting, and subduction of an oceanic spreading ridge along the southern margin of Alaska.", "description": "14 p.", "publisher": { "@type": "Organization", "name": "Canadian Science Publishing" }, "author": [ { "@type": "Person", "name": "Dusel-Bacon, Cynthia cdusel@usgs.gov", "givenName": "Cynthia", "familyName": "Dusel-Bacon", "email": "cdusel@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0001-8481-739X", "url": "https://orcid.org/0000-0001-8481-739X" }, "affiliation": [ { "@type": "Organization", "name": "Geology, Minerals, Energy, and Geophysics Science Center", "url": "https://www.usgs.gov/centers/gmeg" } ] }, { "@type": "Person", "name": "Murphy, J.M.", "givenName": "J.M.", "familyName": "Murphy" } ], "funder": [ { "@type": "Organization", "name": "Geology, Minerals, Energy, and Geophysics Science Center", "url": "https://www.usgs.gov/centers/gmeg" } ], "spatialCoverage": [ { "@type": "Place", "additionalType": "country", "name": "United States", "url": "https://geonames.org/4074035" }, { "@type": "Place", "additionalType": "state", "name": "Alaska" }, { "@type": "Place", "additionalType": "unknown", "name": "Yukon-Tanana Upland" }, { "@type": "Place", "geo": [ { "@type": "GeoShape", "additionalProperty": { "@type": "PropertyValue", "name": "GeoJSON", "value": { "type": "FeatureCollection", "features": [ { "type": "Feature", "properties": {}, "geometry": { "type": "Polygon", "coordinates": [ [ [ -154.248046875, 60.88770004207789 ], [ -141.15234374999997, 60.88770004207789 ], [ -141.15234374999997, 66.93006025862448 ], [ -154.248046875, 66.93006025862448 ], [ -154.248046875, 60.88770004207789 ] ] ] } } ] } } }, { "@type": "GeoCoordinates", "latitude": 63.90888015035119, "longitude": -147.7001953125 } ] } ] }, "OpenAlex": { "abstract_inverted_index": null, "apc_list": null, "apc_paid": null, "authorships": [ { "author_position": "first", "author": { "id": "https://openalex.org/A5089209945", "display_name": "Cynthia Dusel-Bacon", "orcid": "https://orcid.org/0000-0001-8481-739X" }, "institutions": [], "countries": [], "is_corresponding": false, "raw_author_name": "Cynthia Dusel-Bacon", "raw_affiliation_strings": [], "affiliations": [] }, { "author_position": "last", "author": { "id": "https://openalex.org/A5090991647", "display_name": "John Murphy", "orcid": "https://orcid.org/0000-0003-0200-7778" }, "institutions": [], "countries": [], "is_corresponding": false, "raw_author_name": "John M. 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