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After the initial caldera-forming eruption at Valles, the Redondo Peak resurgent dome was uplifted beginning around 1.2 million years ago. [2] Minor eruptions of moat rhyolitic flows occurred from approximately 1.16 million years ago at Cerro del Medio to 0.07 million years ago at Banco Bonito, along a structural ring fracture zone.
The Valles caldera-forming eruption occurred approximately 1.25 million years ago when huge volumes of Bandelier tuff were explosively evacuated from a underground magma storage region.
The Valles Caldera is a supervolcano eruption, like Yellowstone, and one of the largest young calderas on Earth. It formed about 1 million years ago when multiple explosive eruptions occurred that produced an immense outpouring of ash, pumice, and pyroclastic flows.
29 maj 2023 · About 1.25 million years ago, a second caldera formed—Valles Caldera. The eruption was about the same size as that which formed the Toledo Caldera, and it deposited the Tshirege Member of the Bandelier Tuff. The Valles Caldera cut into the Toledo Caldera, partially destroying that earlier structure.
The Valles caldera forms an almost perfect circular depres-sion containing a resurgent dome with more than 3,000 feet of central uplift above the caldera floor and a nearly com-plete ring of moat eruptions. It is no wonder that the Valles caldera is the type example of a resurgent caldera and the place where volcanologists
6 kwi 2021 · The Valles Caldera was created from cataclysmic eruptions of rhyolites with a high silica content (Jacobs, et al. 2016). Most of the tephra units within the surrounding area were created by an eruption from either the Valles Caldera or near it (Jacobs, et al. 2016).
The preserve encompasses much of the Valles caldera, a huge volcanic crater that formed 1.2 million years ago during an enormous volcanic eruption that spread ash over large parts of New Mexico. The caldera is located near the summit of the Jemez Mountains, a large volcanic complex in north-central New Mexico.
