Farallon Trench (original) (raw)
De Farallontrog was een diepzeetrog gedurende het Krijt. De trog was gelegen aan de westkust van Noord-Amerika. Door de westelijke beweging van Noord-Amerika veranderde de trog in wat nu de San Andreasbreuk bij San Francisco is.
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| dbo:abstract | The Farallon Trench was a subduction related tectonic formation located off the coast of the western California continental margin during the late to mid Cenozoic era, around 50 miles southeast of modern-day Monterey Bay. The time duration of subduction began from around 165 Ma when the Farallon Plate replaced the Mezcalera promontory, until the San Andreas Fault straightening around 35 Ma. As data accumulated over time, a common view developed that one large oceanic plate, the Farallon Plate, acted as a conveyor belt, conveying accreted terranes onto the North American west coast. As the continent overran the subducting Farallon Plate, the denser plate became subducted into the mantle below the continent. When the plates converged, the dense oceanic plate sank into the mantle to form a slab below the lighter continent. Rapid subduction under the southwestern North America continent began 40 to 60 million years ago (Ma), during the mid Paleocene to mid Eocene epochs. This convergent subduction margin created a distinctive geomorphologic feature called an oceanic trench, which occurs at a convergent plate boundaries as a heavy metal rich, lithospheric plate moves below a light silica rich continental plate. The trench marks the position at which the flexed subducting slab begins to descend beneath and deform the continental plate margin. By 43 Ma, during the Eocene, worldwide plate motions changed and the Pacific Plate began to move away from North America and subduction of the Farallon Plate slowed dramatically. By around 36 Ma, the easternmost part of the East Pacific Rise, located between the Pioneer and Murray fracture zones at that time, approached the trench and the young, hot, buoyant lithosphere appears to have clogged part of the subduction zone, resulting in widespread dramatic uplift on land. The eventual complete subduction of this plate, consequential contact of the Pacific Plate with the California continental margin, and creation of the Mendocino Triple Junction (MTJ), took place around 30 to 20 Ma. The partial complete subduction and division of the Farallon Plate by the Pacific Plate, created the Juan de Fuca Plate to the north and the Cocos Plate to the south. The final stages of the evolution of California's continental margin was the growth of the San Andreas transform fault system, which formed as the Pacific Plate came into contact with the continental margin and the MTJ was formed. As subduction of the Pacific Plate continued along this margin, and the contact zone grew, the San Andreas proportionally grew as well. (en) De Farallontrog was een diepzeetrog gedurende het Krijt. De trog was gelegen aan de westkust van Noord-Amerika. Door de westelijke beweging van Noord-Amerika veranderde de trog in wat nu de San Andreasbreuk bij San Francisco is. (nl) La fossa Farallon era un'antica fossa oceanica situata nella costa occidentale dell'America del Nord durante il Cretacico superiore. (it) |
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| dbo:wikiPageWikiLink | dbr:San_Andreas_Fault dbr:Monterey_Bay dbr:Eocene dbr:Continental_margin dbr:Convergent_boundary dbr:Plate_tectonics dbr:Cenozoic dbr:Franciscan_Assemblage dbr:North_American_Plate dbr:Pacific_Plate dbr:Paleocene dbc:Cenozoic_paleogeography dbr:Farallon_Plate dbr:Juan_de_Fuca_Plate dbr:Subduction dbr:Accretion_(geology) dbc:Historical_geology dbc:Oceanic_trenches_of_the_Pacific_Ocean dbc:Subduction_zones dbc:Juan_de_Fuca_region dbr:Blueschist dbr:Cocos_Plate dbc:Cretaceous_paleogeography dbr:Metamorphism dbr:Oceanic_trench dbr:Mantle_(geology) dbr:Mendocino_Triple_Junction dbr:Slab_(geology) dbr:Seismic_tomography dbr:List_of_tectonic_plates dbr:Terrane |
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| gold:hypernym | dbr:Trench |
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| rdfs:comment | De Farallontrog was een diepzeetrog gedurende het Krijt. De trog was gelegen aan de westkust van Noord-Amerika. Door de westelijke beweging van Noord-Amerika veranderde de trog in wat nu de San Andreasbreuk bij San Francisco is. (nl) La fossa Farallon era un'antica fossa oceanica situata nella costa occidentale dell'America del Nord durante il Cretacico superiore. (it) The Farallon Trench was a subduction related tectonic formation located off the coast of the western California continental margin during the late to mid Cenozoic era, around 50 miles southeast of modern-day Monterey Bay. The time duration of subduction began from around 165 Ma when the Farallon Plate replaced the Mezcalera promontory, until the San Andreas Fault straightening around 35 Ma. As data accumulated over time, a common view developed that one large oceanic plate, the Farallon Plate, acted as a conveyor belt, conveying accreted terranes onto the North American west coast. As the continent overran the subducting Farallon Plate, the denser plate became subducted into the mantle below the continent. When the plates converged, the dense oceanic plate sank into the mantle to form a sl (en) |
| rdfs:label | Farallon Trench (en) Fossa Farallon (it) Farallontrog (nl) |
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