Topics Laramide Orogeny: Late Cretaceous to Early Eocene Reading: GSA DNAG volume 3, Ch. 6
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1 Topics Laramide Orogeny: Late Cretaceous to Early Eocene Reading: GSA DNAG volume 3, Ch. 6 Late Cretaceous to early Eocene New patterns developed 5 main regions Tectonic interpretations Post-Laramide events Prior Andean Style Continental Margin Eastern fold and thrust belt Adjacent foreland basin Central magmatic arc system Flanking fore-arc and back-arc basins Accretionary complexes Shifting terrains along the coast Pre-Laramide Configuration Fold and thrust belt Magmatic arc Accretionary complexes New Laramide Patterns Uplifted thrust-blocks on craton Localized sedimentation Thick sedimentary accumulation Local thin-skinned foreland thrusting to the west Prior zones of magmatism in the central region cooled Uplift and erosion Laramide Elements Rocky Mountain foreland Fold and thrust belt Magmatic arc Pacific margin 1
2 Changing Zones of Magmatism Magmatism spread eastward To the south: Southern California and Arizona To the north: Idaho and Montana Changing Magmatic Patterns Idaho/Montana Mohave/Arizona Colorado Mineral Belt Main Regions Rocky Mountain foreland Cordilleran fold & thrust belt Sonoran and Mojave Deserts Magmatic arc Pacific margin Rocky Mountain Foreland Thick-skinned deformation Basin sedimentation Local magmatism Thick-Skinned Deformation East of miogeocline wedge and hinge line Thin sedimentary cover Pre-fractured anisotropic cratonic basement Deformation localized along zones of prior weakness Deep-seated thrust faults 2
3 Thick-skinned Deformation Basins bounded by medium-angle reverse faults Uplifts ramped Sedimentary decollement features Bounded by conjugate thrust faults opposite uplift Floating basement wedges East-west faults imply oblique or strike-slip component Other Features Uinta Mts, Utah (11) Thick-skinned Mechanism Basement cored uplift is due to middle or lower crust decoupling Mantle is not deformed beneath uplifts Laramide anticlines are probably located above similar deep uplifts Anticlines of the Williston Basin, edge of Black Hills Cordilleran Fold and Thrust Belt Frontal thrust belt on the east Thin-skinned thrusts Localized by hinge line between miogeocline and craton Hinterland on the west Thrust faults located deep in miogeoclinal sediments Also in craton Cordilleran Fold and Thrust Belt Cooling of western metamorphic belt during late Cretaceous Widespread Eocene volcanism accompanied deformation Challis volcanics Sanpoil volcanics Magmatic Arc Central section weakly magmatic Main zones shifted South into California and Arizona North into Idaho and Montana 3
4 Local Magmatism SW Montana/NW Wyoming Pioneer Batholith Elkhorn and Adel Volcanic Fields Colorado Mineral Belt Hypabyssal rocks Monzonite to syenite SE Arizona and SW New Mexico Calc-alkaline plutons and volcanics Northern Magmatism SW Montana & NW Wyoming Idaho-Montana Porphyry Belt Pioneer Batholith (83-67 Ma) Elkhorn (78-73 Ma) and Adel Volcanic Fields Laccolithic intrusions (54-45 Ma) Core of the Cascade Range Granitoid plutons (75-60 Ma) Tonalite to Granodiorite Some foliated to orthogneiss Dextral slip Colorado Mineral Belt Hypabyssal intrusions (70-50 Ma) Monzonite, granodiorite, syenite Associated ore deposits Mo, Sn, W, U, Th, (Au, Ag) Central Zone Volcanism Andesite volcanoes Older group (70-60 Ma) Younger group (54-44 Ma), similar to Eocene volcanism of the Challis and Absaraka volcanics to the north Sonoran and Mojave Desert Regions Plutonism and metamorphism Calc-Alkaline composition Biotite and two-mica granitoids Porphyry copper deposits Cu, Pb, Zn, (Au, Ag) Ductile flexure of crustal blocks 4
5 Tectonic Interpretations Relatively rapid convergence Shallow angle of subduction Buoyancy of near horizontal slab Caused upward forces Tectonic Pattern Andean type continental margin Magmatic arc system Continuous subduction of the Farralon Plate 5
6 Pacific Plate Margin Local zones of metamorphism within the fold and thrust belt Fore-arc basins Strike-slip sedimentary basins Accretionary tectonic slices Late Cretaceous Margin Basins Allochthonous terranes Magmatic Arcs Metamorphic terranes Paleocene-Eocene Basins Puget Sound Olympic Mountains North Cascades Blue Mountains Klamath Mountains Franciscan Fm. Great Valley Southern California 6
7 Paleogeography Late Cretaceous Okanogan Highlands Klamath uplands Franciscan Terrane Great Valley Foreland Salinian Terrane Transverse Ranges Peninsular Ranges Paleogeography Paleocene-Eocene Extinct magmatic arc Olympic Peninsula Clarno Basin Tyee forearc basin Salinian Terrane Sur-Obispo Terrane Transverse Ranges California Borderland Post-Laramide Events Major zones of extension Normal faulting overprint Thick calc-alkaline volcanic sections Localized sedimentary basins Major strike-slip faulting 7
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