The plutons that compose the northern Sierra Nevadas were formed at very deep depths, while plutons in the southern part of the Sierra Nevadas were formed at shallow depths.
Question
The plutons that compose the northern Sierra Nevadas were formed at very deep depths, while plutons in the southern part of the Sierra Nevadas were formed at shallow depths.
Solution
The formation of plutons in the Sierra Nevadas can be explained by the process of magmatic differentiation and magma evolution.
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Deep Plutons: The northern Sierra Nevadas are composed of plutons that were formed at very deep depths. This is likely due to the subduction of the oceanic plate under the continental plate in this region. As the oceanic plate subducts, it melts and forms magma. This magma is less dense than the surrounding rock, so it rises. However, if the magma is not able to reach the surface, it cools and solidifies slowly, forming large crystals. These large bodies of intrusive igneous rock are known as plutons.
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Shallow Plutons: On the other hand, the southern part of the Sierra Nevadas is composed of plutons that were formed at shallow depths. This could be due to a slower rate of subduction or a thinner crust in the southern region, allowing the magma to cool and solidify closer to the surface.
In both cases, the plutons are eventually exposed at the surface due to the process of uplift and erosion.
Similar Questions
The Sierra Nevada batholith formed due to:Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer.aContinental hotspot volcanism and caldera formationbFlood basalts that formed during subduction of the Pacific plate under the North American platecCrystallization of granodioritic plutons above a Mesozoic subduction zonedFriction melting associated with the Neogene movement of the San Andreas faulteNone of the above
The glaciers that filled the Sierra Nevadan valleys carved V-shapes into the rocks.
What caused the uplift of the Sierra Nevadas?
During the Pleistocene Ice Age,Group of answer choicesthe southern boundary of the North American tundra moved 20° of latitude northward.pluvial lakes dried up in Utah and Nevada, while increased rainfall farther south caused equatorial rainforests to flourish.CaCO3 shells in the world's oceans recorded a low ratio of O18 to O16.mammoths, mastodons, woolly rhinos, saber-toothed cats, and giant cave bears inhabited North America.
disturb rock, plate margins, at the Earth's surface, deeper within the crust, constructive (divergent) Both are found at . Both form at boundaries or above subduction zones. Volcanoes form and earthquakes form . Volcanoes form new rock but earthquakes produce seismic waves and .
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