A Clinopyroxene-Plagioclase Geobarometer for A-type Silicic Volcanic Rocks

John Wolff1, Alexander Andrew Iveson2, Klarissa Davis3, Thomas E Johnson3, Shawn Gahagan3 and Ben S Ellis4, (1)Washington State University, School of the Environment, Pullman, WA, United States, (2)Washington State University, Geology, Pullman, WA, United States, (3)Washington State University, Pullman, WA, United States, (4)ETH Zurich, Institute of Geochemistry and Petrology, Zurich, Switzerland