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The Castle Rock And Ironside Mountain Calderas, Eastern Oregon, Usa: Adjacent Venting Sites Of Two Dinner Creek Tuff Units—The Most Widespread Tuffs Associated With Columbia River Flood Basalt Volcanism, Matthew Cruz, Martin J. Streck
The Castle Rock And Ironside Mountain Calderas, Eastern Oregon, Usa: Adjacent Venting Sites Of Two Dinner Creek Tuff Units—The Most Widespread Tuffs Associated With Columbia River Flood Basalt Volcanism, Matthew Cruz, Martin J. Streck
Geology Faculty Publications and Presentations
The Dinner Creek Tuff is an important unit of mid-Miocene rhyolite volcanism contemporaneous to flood basalts of the Columbia River magmatic province. Field mapping along with analytical data of tuff samples identify two calderas, the Castle Rock and Ironside Mountain calderas, as the venting sites of two widespread ignimbrites of the Dinner Creek Tuff. Both calderas lie within the area of the proposed general storage sites of main-phase Columbia River Basalt magmas. The Castle Rock caldera formed during the eruption of the 16.16 Ma Dinner Creek Tuff unit 1. The northwestern boundary of the caldera is roughly defined by the …