Post by 1dave on Jun 8, 2020 3:36:31 GMT -5
volcanohotspot.wordpress.com/2016/10/18/the-utah-nevada-ignimbrite-flareup-of-30-ma/
Ran across an article in PhysOrg a few years ago that described a caldera flare-up in Nevada – Utah that began around the same time as the San Juan Caldera field in southwestern Colorado, some 38 – 18 Ma.
I wrote about the San Juan Caldera field nearly three years ago in a VC post located here: volcanocafe.wordpress.com/2013/12/23/what-happened-at-the-end-of-the-eocene/
Imagine my surprise to discover that there was a concurrent caldera outbreak in Nevada and Utah around the same time. And the outbreak in those states ends up being more widespread and produced more ignimbrite volume than the one in Colorado. The Colorado activity stretched from 40 – 25 Ma. The Nevada – Utah activity appears to be a little more recent – 38 – 18 Ma.
I wrote about the San Juan Caldera field nearly three years ago in a VC post located here: volcanocafe.wordpress.com/2013/12/23/what-happened-at-the-end-of-the-eocene/
Imagine my surprise to discover that there was a concurrent caldera outbreak in Nevada and Utah around the same time. And the outbreak in those states ends up being more widespread and produced more ignimbrite volume than the one in Colorado. The Colorado activity stretched from 40 – 25 Ma. The Nevada – Utah activity appears to be a little more recent – 38 – 18 Ma.
