Item talk:Q235301

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   "abstract": "We present an apatite fission-track (AFT) study of five plutonic rocks and seven metamorphic rocks across 310 km of the Yukon\u0096Tanana Upland in east-central Alaska. 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.",
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