u/Chole_Wunt

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?

Ive taken a stance of just blocking useless people on reddit instead of engaging, just to try and keep my sanity..... and prevent my accounts from getting banned. Because I do have a habit of feeding the trolls.

This is mostly the people that just interject themselves into a thread to do personal attacks and just shit on well thought out conversation.

So Ive been clicking on a lot of profiles to hit "block user" more than I ever have. And Ive noticed about 80% are 5+ year old accounts. Many are 8 year old accounts. I just blocked a 10 year old account. Ill look through their comments and its just full of shitty one-loner comments and condescending emojis.

I find it weird because Ive had accounts banned for the most innocent confrontations. Even just being rude. And I cant image people habitually doing this are able to keep an account for that long.