Snow Peak, Oregon: Latest Miocene low-K tholeiite volcanism in the Cascadia forearc

Snow Peak is part of a widespread suite of LKT magmas that erupted between 5-8 Ma throughout the central Oregon Cascade Range in response to intra-arc rifting, and Snow Peak shows that LKT magmatism at this time extended well into the forearc of the central Oregon Cascade Range. Overall LKT magmas of this age occur over a distance of ~ 120 km normal to the arc front. We speculate that the presence of Snow Peak may relate to the western extension of the Brothers Fault Zone into the Cascade forearc.