Everything about The Nevadan Orogeny totally explained
The
Nevadan Orogeny was a major
mountain building event that took place along the western edge of ancient
North America between the Mid to Late
Jurassic (between about 180 and 140 million years ago). The Nevadan
orogeny was the first of three major mountain building episodes to transform Western North America between the Late
Mesozoic and Early
Cenozoic Eras, the latter two being the
Sevier and
Laramide orogeny, chronologically. Much like the two orogenies that followed, the Nevadan was caused by the
subduction of
oceanic lithosphere at a
subduction zone running along the edge of the North American continent. This resulted in relatively cool
oceanic crust descending into the
lithosphere very quickly, and steeply beneath the edge of the
continent. Due to the melting of the subducted plate,
magma rose from the subducted crust producing a chain of
volcanoes. Due to the steep angle of the subducted plate, these were located relatively close to continent's edge.
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