Nevadan Orogeny – 210 mya. Evidence for the Acadian Orogeny from 410–380 Ma in the southern and central Appalachian internides is mostly lacking. R.D. Uplift of the ancestrial Nevadan Mountains caused by the formation of the main body of intrusive granitic rocks that now make up most of the Sierra Nevada (subduction zone probably similar to the current situation along the West Coast of South America). Most of the crustal shortening took place by thrusting, constrained to have occurred from ̃155 to 150 Ma on both the roof and basal thrusts. collapse of the arc during the Nevadan orogeny, which ranged in age between about 150 to 145 Ma in the Klamath region (Saleeby, et al., 1982, Harper and Wright, 1984) was syntectonic with, or was closely followed by deposition of the volcanolithic clastic rocks of the Myrtle Group. Sonoma Orogeny (200-280 Ma) • Permo-Triassic • Collision of Arc With a Passive Margin • Island Arc Terrains Were Accreted • Golconda Allochthon – Thrust Partly Over Roberts Mountain Allochthon Nevadan Orogeny (140-150 Ma) • Several Upper Jurassic Arcs Collided • Cretaceous Franciscan Fm in the accretionary prism The Klamath phase of the Nevadan orogeny resulted from contraction of the west‐facing intraoceanic arc and Josephine backarc basin beneath the continental margin. Mid-Palaeozoic Sedimentation and Neoacadian Docking of the Carolina Superterrane. The Mesozoic Nevadan orogeny in the northern Sierra Nevada metamorphic belt, California, may be attributed to arc-continent collision, stratigraphic data and macroscopic cross cutting relations suggest successive accretion of two arcs along an active continental margin. Nevadan orogeny, the composite Klamath terrane was overlain with great unconformity by Cretaceous and Tertiary overlap assemblages of sedimentary and volcanogenic strata at the north end of the Great Valley and along the western margin of the Cascade Ranges. Hatcher Jr, in Encyclopedia of Geology, 2005. The Laramide Orogeny is thought to be a response to the subduction of warm and buoyant ocean floor produced during the Cretaceous spreading rate increase. Deformation and metamorphism related to the Nevadan orogeny appears to have extended from ̃155 to 135 Ma.
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