Western Oregon University
5:30 pm social hour
7:00 pm presentation
This talk will focus on ash-flow tuffs that shed light on the earliest
caldera-forming eruption at Newberry Volcano, which is located at the
west end of the High Lava Plains about 60 km east of the Cascades.
Geochemical data reveal a dynamic scenario involving injection of basalt
into a rhyolitic magma body and mixing to yield subsequently erupted
dacitic tuffs. Further, these data show that both Cascadia subduction
and the High Lava Plains influenced silicic magmatism at Newberry.
Central Oregon Geoscience Society
P.O. Box 2154, Bend, Oregon 97709