Magmatism is intimately tied to tectonic processes, thus the study of magmatic rocks provides important clues about tectonic setting and evolution. Nowhere is this more evident than in the northwestern U.S., where distinctive igneous suites occur throughout the Cascade arc, the Basin and Range province, the Columbia Plateau, and the Yellowstone Hotspot track. This session will review a generation of work on the igneous rocks of the northwestern U.S. We invite contributions from those who study the igneous rocks of the region and use them to provide insight into the diverse array of tectonic environments and petrogenetic processes that are present. We welcome workers who apply petrological, geochemical, geophysical modeling and other techniques to the study of igneous rocks from the northwestern U.S. Given the excellent exposures of igneous rocks throughout the region, we particularly encourage contributions from those who also use constraints obtained from field investigations of igneous suites.

• GS: Geochemical Society -
• GAC: Geological Association of Canada -
• GSA: Geological Society of America -
• MSA: Mineralogical Society of America -