Optical minerology

it was cut no rifting

Not connected to the Walker lane, but related to it by one fault. Walker Lane doesn't run through the Owens Valley, but veers East, North of Mono Lake through to Death Valley until it end at the West to East Garlock Fault Zone. There is a geologic paper on why the Long Valley Caldera was formed and the Walker Lane fault system was not the cause as much as just being pulled into the Eastern Sierra shear zone. Keep in mind that many present day fault lines didn't exist before the VEI 8 eruption 760,000 ya. The area of what came to be known as the LVC was twisted around causing the weakened crust suitable for a large magma chamber to form. The following is a quote from a paper dealing with it. It is a bit complicated, but it goes into the history rather well. I provided a link at the bottom if you're more interested. "The tectonic interaction between the Eastern California Shear Zone and the Walker Lane system localizes volcanism at transtensional pull-apart sections in the Mono-Long Valley region. Long Valley Caldera is located at the western end of the Mina Deflection, a broad zone of northeast-trending left-lateral faults that form a right jog in the regional right-lateral fault system of the Owens Valley providing a link to the Walker Lane to the northeast (Figure 3)" cgec.ucdavis.edu/wp-content/uploads/final-trip-guide-2011.pdf Here is a link to the Walker Lane Map of it and a summary of its history. I also want to warn folks of articles that warn that droughts may cause the Caldera to erupt for the rankest most bogus pseudoscientific tripe I've seen because they have to make Climate Change more alarming. So there are peer reviewed papers claiming drought causes super eruptions. Don't pay attention to them. www.researchgate.net/figure/Regional-tectonic-setting-of-Long-Valley-caldera-CA-NV-The-caldera-occurs-in-a-region_fig5_26644825

Great video I grew up in mammoth lakes. Only thing I need to add it’s pronounced mo-no lake not mon-o lake.