A new look at “old” tuffs from Newberry Volcano: Evidence for dynamic magmatic processes at a geologic crossroads in central Oregon

Jeff Templeton

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.