@article{GuzmanPetrinovicBrodetal.2011,
  author    = {Guzman, S. and Petrinovic, I. A. and Brod, J. A. and Hongn, Fernando D. and Seggiaro, R. E. and Montero, C. and Carniel, Roberto and Dantas, E. L. and Sudo, Masafumi},
  title     = {Petrology of the Luingo caldera (SE margin of the Puna plateau) a middle Miocene window of the arc-back arc configuration},
  series = {Journal of volcanology and geothermal research},
  volume    = {200},
  journal   = {Journal of volcanology and geothermal research},
  number    = {3-4},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0377-0273},
  doi       = {10.1016/j.jvolgeores.2010.12.008},
  pages     = {171 -- 191},
  year      = {2011},
  abstract  = {We describe the petrographic characteristics, whole-rock geochemistry and mineral chemistry of rocks from the Pucarilla-Cerro Tipillas Volcanic Complex with emphasis on the rocks belonging to the middle Miocene Luingo caldera, located in the south-eastern portion of the Central Volcanic Zone (CVZ) of the Andes. We modelled the petrogenesis of the Luingo caldera rocks as a mixture of ca. 20\% crustal magmas and 80\% of mantle magmas by AFC with recharge processes. A comparison of Luingo geochemical data with the composition of Miocene-Pliocene volcanic rocks from the broad area, points to major thickening events during the middle Miocene for the western portion and during the upper Miocene for the eastern portion of the Southern CVZ. In the eastern sector (similar to 66 degrees W) the mantle source appears to change from a spinel-lherzolite type for the middle Miocene to a garnet-lherzolite type for the upper Miocene-Pliocene magmas. The areal distribution of the volcanic products led to the recognition of approximately equivalent areas covered by volcanic rocks both in the eastern and in the western Puna borders. This indicates a broad arc, which was structurally controlled at the proto-Puna/Puna margins, whose geochemical differences are related with variations in crustal thicknesses and heterogeneous mantle sources from west to east.},
  language  = {en}
}
@article{GuzmanStreckerMartietal.2017,
  author    = {Guzman, Silvina and Strecker, Manfred and Marti, Joan and Petrinovic, Ivan A. and Schildgen, Taylor F. and Grosse, Pablo and Montero-Lopez, Carolina and Neri, Marco and Carniel, Roberto and D. Hongn, Fernando and Muruaga, Claudia and Sudo, Masafumi},
  title     = {Construction and degradation of a broad volcanic massif: The Vicuna Pampa volcanic complex, southern Central Andes, NW Argentina},
  series = {Geological Society of America bulletin},
  volume    = {129},
  journal   = {Geological Society of America bulletin},
  publisher = {American Institute of Physics},
  address   = {Boulder},
  issn      = {0016-7606},
  doi       = {10.1130/B31631.1},
  pages     = {750 -- 766},
  year      = {2017},
  abstract  = {The Vicuna Pampa volcanic complex, at the SE edge of the arid Puna Plateau of the Central Andes, records the interplay between volcanic construction and degra-dational processes. The low-sloping Vicuna Pampa volcanic complex, with a 1200-m-deep, southeastward-opening depression, was previously interpreted as a collapse caldera based on morphological considerations. However, characteristic features associated with collapse calderas do not exist, and close inspection instead suggests that the Vicuna Pampa volcanic complex is a strongly eroded, broad, massif-type composite volcano of mainly basaltic to trachyandesitic composition. Construction of the Vicuna Pampa volcanic complex occurred during two distinct cycles separated by the development of the depression. The first and main cycle took place at ca. 12 Ma and was dominated by lava flows and subordinate scoria cones and domes. The second cycle, possibly late Miocene in age, affected the SW portion of the depression with the emplacement of domes. We interpret the central depression as the result of a possible sector collapse and subsequent intense fluvial erosion during middle to late Miocene time, facilitated by faulting, steepened topography, and wetter climate conditions compared to today. We estimate that similar to 65\% of the initial edifice of similar to 240 km(3) was degraded. The efficiency of degradation processes for removing mass from the Vicuna Pampa volcanic complex is surprising, considering that today the region is arid, and the stream channels within the complex are predominantly transport limited, forming a series of coalesced, aggraded alluvial fans and eolian infill. Hence, the Vicuna Pampa volcanic complex records the effects of past degradation efficiency that differs substantially from that of today.},
  language  = {en}
}