title: Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body.
abstract: The Altiplano-Puna Magma Body (APMB) in the Central Andes is the largest imaged magma reservoir on Earth, and is located within the second highest orogenic plateau on Earth, the Altiplano-Puna. Although the APMB is a first-order geologic feature similar to the Sierra Nevada batholith, its role in the surface uplift history of the Central Andes remains uncertain. Here we show that a long-wavelength topographic dome overlies the seismically measured extent of the APMB, and gravity data suggest that the uplift is isostatically compensated. Isostatic modelling of the magmatic contribution to dome growth yields melt volumes comparable to those estimated from tomography, and suggests that the APMB growth rate exceeds the peak Cretaceous magmatic flare-up in the Sierran batholith. Our analysis reveals that magmatic addition may provide a contribution to surface uplift on par with lithospheric removal, and illustrates that surface topography may help constrain the magnitude of pluton-scale melt production.
authors: Department of Earth and Planetary Sciences, University of California Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA.
authors: Jonathan P
authors: JP
authors: Perkins
authors: Department of Geosciences, The University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85712, USA.
authors: Kevin M
authors: 0000-0002-2938-4306
authors: KM
authors: Ward
authors: College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Administration Building, Corvallis, Oregon 97331-5503, USA.
authors: Shanaka L
authors: 0000-0002-0310-5516
authors: SL
authors: de Silva
authors: Department of Geosciences, The University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85712, USA.
authors: George
authors: G
authors: Zandt
authors: Department of Geosciences, The University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85712, USA.
authors: Susan L
authors: SL
authors: Beck
authors: Department of Earth and Planetary Sciences, University of California Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA.
authors: Noah J
authors: NJ
authors: Finnegan