2.6 Sierra Nevada and Coast Ranges, What is a Batholith? During the Jurassic, when the North Atlantic began to open, a subduction zone formed along the western margin of the North American Plate. Evidence for this episode of subduction is …
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2.5 Mountain Building Along Andean-type Margins: Converging Plate Tectonics The first stage in the development of an Andean type mountain belt occurs prior to the formation of the subduction zone. At this time, the continental margin is a passive margin. …
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2.4 Andes Plate Margins: Island Arcs: Subduction of an Oceanic Plate beneath a Continental Plate The subduction of oceanic lithosphere gives rise to two different types of mountain belts.1). Where oceanic lithosphere subducts beneath an oceanic plate, an island arc …
2.3 Dynamics at Subduction Zones: Back Arc Spreading at Convergent Margins Because subduction zones form where two plates are converging, it is natural to assume that large compressional forces are at work to deform the plate margins. Indeed, this is …
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2.2 Subduction Zones: Deep Ocean Trenches and Volcanic Island Arcs To unravel the events that produce mountains, researchers examine ancient mountain structures as well as sites where orogenesis is currently active. Of particular interest are active subduction zones, where lithospheric …
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