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PLUTONS: Investigating the Relationship between Pluton Growth and Volcanism in the Central Andes

Guest editors: George Zandt, Shan de Silva, Rodrigo del Potro, Matthew Pritchard, and Gary Michelfelder

Magmatism plays a fundamental role in the generation of continental crust, and the thermal and rheological evolution of mountain belts. Large-scale melting of the continental crust is manifest both as granite batholith intrusions and large volume volcanic eruptions (ignimbrites). While there is compelling evidence that at least some large silicic ignimbrites are the erupted upper parts of pluton-scale granite magma chambers, there is a long history of controversy over whether the intrusive and extrusive records of magmatism occur simultaneously, or indeed, are related at all. The PLUTONS project was developed to address this controversy by investigating the relationship between ongoing magma intrusion within the middle to upper crust in the central Andes (documented with InSAR), the world’s largest magma body (imaged geophysically), and the most recent ignimbrite flare-up in the world (over the last 10 million years). The project focused geophysical, geochemical, geomorphological techniques and numerical modelling on two areas with known intrusions over at least the last 10-20 years (Uturuncu, Bolivia and Lazufre on the Chile-Argentina border), in order to constrain how magma accumulates and erupts in areas of active intrusion and volcanism. The PLUTONS project (2009-2015) is a collaborative effort funded by the National Science Foundation, the National Environmental Research Council in the UK, NSERC in Canada, and through in-kind collaborations from several institutions in Bolivia, Chile, and Argentina. This themed volume will include inter-disciplinary contributions from the PLUTONS project to address fundamental questions of the relation between intrusion and eruption in the central Andes: (1) the rates of intrusion and eruption and whether those rates have been steady or episodic over the past several million years; (2) the characteristics of the active intrusions, including their depth, volume, temperature, melt content, and shape and how they relate to magma chambers that erupted over the last several million years; and (3) how the active intrusion interacts with its surroundings through deformation, faulting, associated fluid flow (into nearby sills), metamorphic reactions, and geothermal activity (fumaroles and hot springs temperature and compositional characteristics and/or changes).

Dedication: In memory of Todd Christian Feeley (1961–2015)
Michelfelder et al.
2018, v. 14, p. 951-953,

Synthesis: PLUTONS: Investigating the relationship between pluton growth and volcanism in the Central Andes
Pritchard et al.
2018, v. 14, p. 954-982,

Contributions appear below in the order they were published.

Geochronological imaging of an episodically constructed subvolcanic batholith: U-Pb in zircon chronochemistry of the Altiplano-Puna Volcanic Complex of the Central Andes
Kern et al.
2016, v. 12, p. 1054-1077,

Topographic constraints on magma accumulation below the actively uplifting Uturuncu and Lazufre volcanic centers in the Central Andes
Perkins et al.
2016, v. 12, p. 1078-1096,

New constraints on the magma distribution and composition beneath Volcán Uturuncu and the southern Bolivian Altiplano from magnetotelluric data
Comeau et al.
2016, v. 12, p. 1391-1421,

A one-dimensional seismic model for Uturuncu volcano, Bolivia, and its impact on full moment tensor inversions
Shen et al.
2017, v. 13, p. 1-10,

Seismic attenuation, time delays, and raypath bending of teleseisms beneath Uturuncu volcano, Bolivia
Farrell et al.
2017, v. 13, p. 699-722,

Thermomechanical modeling of the Altiplano-Puna deformation anomaly: Multiparameter insights into magma mush reorganization
Gottsmann et al.
2017, v. 13, p. 1042-1065,

Decelerating uplift at Lazufre volcanic center, Central Andes, from A.D. 2010 to 2016, and implications for geodetic models
Henderson et al.
2017, v. 13, p. 1489-1505,

Time-dependent deformation of Uturuncu volcano, Bolivia, constrained by GPS and InSAR measurements and implications for source models
Henderson et al.
2017, v. 13, p. 1834-1854,

Focused magmatism beneath Uturuncu volcano, Bolivia: Insights from seismic tomography and deformation modeling
Kukarina et al.
2017, v. 13, p. 1855-1866,

Receiver function analyses of Uturuncu volcano, Bolivia and vicinity
McFarlin et al.
2018, v. 14, p. 50-64,

50 years of steady ground deformation in the Altiplano-Puna region of southern Bolivia
Gottsmann et al.
2018, v. 14, p. 65-73,

Volcanism and tectonism in the southern Central Andes: Tempo, styles, and relationships
Naranjo et al.
2018, v. 14, p. 626–641,

New insights into the magmatic-hydrothermal system and volatile budget of Lastarria volcano, Chile: Integrated results from the 2014 IAVCEI CCVG 12th Volcanic Gas Workshop
Lopez et al.
2018, v. 14, p. 983-1007,

Miocene to Holocene geological evolution of the Lazufre segment in the Andean volcanic arc
Naranjo et al.
2019, v. 15, p. 47-59,

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