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Cretaceous sedimentary blanketing and tectonic rejuvenation in the Western Klamath moutains: Insights from thermochronology |
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| Authors: | Geoffrey E Batt Gregory D Harper Matthew Heizler Mary Roden-Tice |
| Institution: | 1. John de Laeter Centre of Mass Spectrometry, the University of Western Australia, WA6009, Crawley, Australia 2. New Mexico Brueau of Geology & Mineral Resources, New Mexico Tech, 801 Leroy Place, 87801-4796, Socorro, NM, USA 3. Centre for Earth and Environmental Science, State University of New York at Plattsburgh, Plattsburgh, New York, USA |
| Abstract: | We present new thermochronometric analyses of 4 samples from the Western Klamath mountains in California and Oregon, together with a re-evaluation of available geological constraint from a thermo-tectonic perspective. Early Cretaceous cooling of basement samples is seen to reflect significant exhumation by normal faulting, linked to the Separation Episode during which the Klamah region was rifted away from the formerly contiguous Sierra Nevada block. Syn-faulting sedimentation and subsequent Early Cretaceous re-heating of samples establishes the former continuity of scattered Hornbrook Formation remnants as a significant sedimentary basin spanning the Klamath region, with local maximum thickness of at least 5 km. This basin experienced significant inversion during early Cordilleran development around 110–120 Ma, with further unrooting and almost complete eversion in the Late Cretaceous, associated with Laramide uplift of the region. |
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