COMPOSITIONAL PROGRESSION FROM BASALT-ONLY TO BASALT+ANDESITE+DACITE DURING THE 300 KA ERUPTIVE HISTORY OF MT. VENIAMINOF, ALASKA
CALVERT, Andrew, BACON, Charles and SISSON, Thomas (Tom), USGS, Volcano Science Center, 345 Middlefield Road, Menlo Park, CA 94025-0000