Foster, David; Doughty, P Ted; Kalakay, Thomas J.; Fanning, Christopher; Coyner, Samuel; Grice, Warren C.; Vogl, James
The Priest River, Clearwater, Bitterroot, and Anaconda metamorphic core complexes of the northern Rocky Mountains were exhumed in Eocene time by crustal extension, which was linked via dextral displacement on the Lewis and Clark fault zone. Detailed geochronology and thermochronology (U-Pb, 40Ar/39Ar, and fission- track) from the Bitterroot complex indicates that extension started at 53 ± 1 Ma and continued until after 40 Ma. New U-Pb zircon and 40Ar/39Ar data from the Anaconda complex and...[Show more]
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