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21 Cards in this Set
- Front
- Back
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What formed during the Mesozoic era?
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Subduction zone formed along western margin.
As a result, granitic magma crystallized within the N. Amer. plate, forming oldest plutons in Sierra NV province (~210MYA) |
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Describe appearance of batholiths
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Granitic
High silica Light color |
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What kind of rocks comprise the Sierra Nevada?
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Mesozoic plutonic rocks
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How are ryholitic magmas formed?
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Volatiles are RELEASED from the subducting plate.
They RISE into the overlying mantle wedge and cause the hot, but previously dry, mantle wedge to MELT. These basaltic magmas RISE into the CONTINENTAL CRUST. The now heated continental crust MELTS to produce rhyolitic magmas. |
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The protoliths (= “before rocks”) of the metamorphic pendants include what type of rocks?
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Sedimentary & volcanic rocks
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Continentally derived, clastic metasediments formed on the...
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Paleozoic North America Plate nearshore/coastal
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Gold formation marks the end of what?
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Batholith formation
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Which era did this occur in?Sediments and volcanic rocks were deposited, buried & metamorphosed
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Paleozoic
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Faulting and uplift of Basin & Range AND volcanoes above Sierra batholith eroding away occur in which era?
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Cenozoic
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What happens in the Mesozoic era?
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Subduction zone formed along western margin.
As a result, granitic magma crystallized within the N. Amer. plate, forming oldest plutons in Sierra NV province |
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What happened during the Paleozoic era?
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Sediments & volcanic rocks were deposited, buried & metamorphosed
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Subduction zone formed along western margin.
As a result, granitic magma crystallized within the N. Amer. plate, forming oldest plutons in Sierra NV province Which era did this occur in? |
Mesozoic
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What happened during the Cenozoic era?
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Faulting & uplift of Basin & Range
Volcanoes above Sierra batholith erode away |
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What kind of rock forms the Sierra Nevada?
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Volcanic rock
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Last glacial maximum (~160-20k) responsible for what?
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Much of spectacular landscapes of the High Sierras
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Most of CA's water is provided from where?
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Owen's valley in Sierra Nevada
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Sierra Range was formed through
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Active normal fault
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What kind of rocks comprise the Sierra NV?
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Mesozoic plutonic rocks
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Heated continental crust melts to form what?
What does this then turn into? |
Rhyolitic magmas
Granite |
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Are the huge volcanoes that formed over the batholith still in existence? Why or why not?
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NO!
They eroded away!! |
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The rate of subduction increasing 80 MYA caused what?
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The angle of subduction to decrease
As a result... |
