Density and lithospheric strength models of the Yellowstone–Snake River Plainvolcanic system from gravity and heat flow data

DeNosaquo, Katrina; Smith, Robert; Lowry, Anthony

The structure and composition of the Yellowstone–Snake River Plain (YSRP) volcanic system were analyzedusing gravity data taken at over 30,000 stations in the YSRP and surrounding region. Additional constraintswere provided by tomographic seismic velocity models, new heat flow and temperature information, GPSderivedstrain rates, earthquake locations, and chemical analyses of volcanic rocks. P-wave velocity modelsand velocity–density data based on petrologic information were used to constrain three-dimensional densitymodels. Rheology and strength properties were calculated at selected locations and compared to earthquakefocal depths. Results of this study suggest that the lower crust of the Snake River Plain (SRP) has beenthickened by the addition of an underplated layer composed primarily of clinopyroxene, having a density of3200 kg/m3. A mid-crustal high-density sill is composed of a series of gabbroic lenses inter-fingering withthe granitic upper crust. This geometry yields a bulk composition comparable to diorite and a density of2900 kg/m3. The mid-crustal sill varies from 4 to 11 km in thickness, resulting in a series of SE-NW-trendinggravity highs observed along the axis of the SRP. The mid-crustal sill extends up to 20 km southeast of theSRP volcanic field and causes asymmetry of the gravity field. The Yellowstone Plateau volcanic field densitymodel reveals low-density partial melt 10 km beneath the caldera that shallows under the northeasterncaldera, and continues laterally 20 km north of the caldera boundary and notably increases the previouslyestimated size of the magma reservoir by ~20%. The caldera melt body has a density of 2520 kg/m3 and asignificantly lower value of 2470 kg/m3 for the northeastern caldera melt body. Southwest of Yellowstone,the crustal section occupied by the mid-crustal sill in the SRP and the partial melt in Yellowstone constitute atransition area between the active Yellowstone magma system and the now volcanically quiescent SRP, witha density of 2820 kg/m3. Strength models show that the crust of the YSRP becomes progressively strongerand cooler with increasing distance from Yellowstone, and tectonic earthquakes within the Yellowstonecaldera are unlikely to nucleate below 4–6 km depth, thus limiting the maximum magnitude of earthquakesto M≤6.5.

Density and lithospheric strength models of the Yellowstone–Snake River Plainvolcanic system from gravity and heat flow data

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