A Geochemical Study of Cenozoic Magmatism Along an East-West Transect from Central Great Basin, Nevada to the Ancestral Cascade Arc, California – A Compositional Journey Over Space and Time

Geochemical study of Cenozoic mafic volcanism in the west-central Great Basin, western Nevada, and the Ancestral Cascades Arc, California

“…2). Figure 1 shows the sample locations; a complete list of sample names and locations (note: samples were located using a handheld global positioning system [GPS] and GPS coordinates) is presented in Timmermans (2015) and Supplemental Table S1 1 .…”

“…longitudinally into three broad regions ( Fig. 1): (1) the GB at approximate longitudes 117.00° to 119.52° (includes Stillwater Mountain Range, Truckee Range, Hot Springs Mountain, and Churchill Group), (2) the eastern ACA at approximate longitudes 119.52° to 120.00° (includes Sparks, Silver City, Pyramid, I-80 Suite, and Lousetown), and (3) the western ACA at approximate longitudes 120.00° to 121.00° (includes Stampede Reservoir, Ladybug, Portola, Mount Lincoln, Dog Valley, Stanford/Twin Peaks, Pond Terrace, Andesite Ridge, Devil's Peak, Boreal Ridge, Needle Peak, Squaw, Lowell Ridge, Sawtooth, Henness Pass, and Susanville) (Timmermans, 2015). Also included are geochemical and isotopic data for all three regions from Henry and Sloan (2003), Sloan et al (2003), anddu Bray et al (2009).…”

Geology and Geochemistry of the 25 Ma Underdown Caldera Tuffs and the Tuff of Clipper Gap, Western Nevada Volcanic Field, North-Central Nevada

“…The 36-18 Ma Ignimbrite Flare-up is responsible for the formation of the Western Nevada Volcanic field (WNVF), a belt of calderas extending across the state of Nevada, USA. The belt was formed as a result of a sweep of magmatic activity caused by the rollback of the shallowly subducting Farallon plate beneath North America (Best et al, 2013;Henry and John, 2013;Best et al, 2016;Timmermans, 2015). During rollback, intrusions of mantle-derived magmas stalled in the thick continental crust, partially melting the continental crust, and ultimately erupting as caldera forming ignimbrite magmas (Hildreth and Moorbath, 1988;Annen and Sparks, 2002;Clemens and Stevens, 2012).…”