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What formed during the Mesozoic era?
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)
Describe appearance of batholiths
Granitic
High silica
Light color
What kind of rocks comprise the Sierra Nevada?
Mesozoic plutonic rocks
How are ryholitic magmas formed?
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.
The protoliths (= “before rocks”) of the metamorphic pendants include what type of rocks?
Sedimentary & volcanic rocks
Continentally derived, clastic metasediments formed on the...
Paleozoic North America Plate nearshore/coastal
Gold formation marks the end of what?
Batholith formation
Which era did this occur in?Sediments and volcanic rocks were deposited, buried & metamorphosed
Paleozoic
Faulting and uplift of Basin & Range AND volcanoes above Sierra batholith eroding away occur in which era?
Cenozoic
What happens in the Mesozoic era?
Subduction zone formed along western margin.

As a result, granitic magma crystallized within the N. Amer. plate, forming oldest plutons in Sierra NV province
What happened during the Paleozoic era?
Sediments & volcanic rocks were deposited, buried & metamorphosed
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
What happened during the Cenozoic era?
Faulting & uplift of Basin & Range
Volcanoes above Sierra batholith erode away
What kind of rock forms the Sierra Nevada?
Volcanic rock
Last glacial maximum (~160-20k) responsible for what?
Much of spectacular landscapes of the High Sierras
Most of CA's water is provided from where?
Owen's valley in Sierra Nevada
Sierra Range was formed through
Active normal fault
What kind of rocks comprise the Sierra NV?
Mesozoic plutonic rocks
Heated continental crust melts to form what?

What does this then turn into?
Rhyolitic magmas

Granite
Are the huge volcanoes that formed over the batholith still in existence? Why or why not?
NO!

They eroded away!!
The rate of subduction increasing 80 MYA caused what?
The angle of subduction to decrease

As a result...