Are there extinct volcanos in the Sierra Nevada Mountains? Why not? Also, what is causing them to uplift.
I am pretty well educated on geology for a hobbyist so dont be afraid to get technical.
I know the Sierras are an uplifted batholith and the orientation of the uplift.
But I was wondering why there are no extinct volcanos in the Sierras? I see them south of the sierras. And of course north of the sierras starting at Lassen. But noticed a void from Lassen to about Glass mountain of no extinct volcanoes.
My reasoning here is that subduction of a tectonic plate causes volcanos. The Farallon plate is still being subducted and fueling the Northern currently active volcanos. My understanding is there should be volcanos in California that used to be active, but "shut off" as the Farallon plate was fully subducted and the triple plate boundary moved north. This should have created a volcanic arc like the one in N. California and the Cascades, right? And those extinct volcanos should still be there.
Im wondering if the more recent Sierra Nevada uplift just destroyed them all? Or am I looking in the wrong place?
Also, I was wondering what mechanic is causing the Sierra Nevada Mountains to uplift. And why so rapidly?