Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/10597
DC FieldValueLanguage
dc.date.accessioned2017-09-11T08:15:01Zen
dc.date.available2017-09-11T08:15:01Zen
dc.date.issued2017-05en
dc.identifier.urihttp://hdl.handle.net/2122/10597en
dc.description.abstractThe Vicuña Pampa volcanic complex, at the SE edge of the arid Puna Plateau of the Central Andes, records the interplay between volcanic construction and degradational processes. The low-sloping Vicuña Pampa volcanic complex, with a 1200-mdeep, 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 Vicuña Pampa volcanic complex is a strongly eroded, broad, massif-type composite volcano of mainly basaltic to trachyandesitic composition. Construction of the Vicuña 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 Mio-cene 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 ~65% of the initial edifice of ~240 km3 was degraded. The efficiency of degradation processes for removing mass from the Vicuña 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 Vicuña Pampa volcanic complex records the effects of past degradation efficiency that differs substantially from that of today.en
dc.language.isoEnglishen
dc.relation.ispartofGSA Bulletinen
dc.relation.ispartofseries/129(2017)en
dc.subjectvolcanoesen
dc.titleConstruction and degradation of a broad volcanic massif: The Vicuña pampa volcanic complex, southern central Andes, NW Argentinaen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber750-766en
dc.subject.INGVVicuña Pampa volcanic complex, southern Central Andes, NW Argentinaen
dc.identifier.doi10.1130/B31631.1en
dc.description.obiettivoSpecifico1V. Storia eruttivaen
dc.description.obiettivoSpecifico2V. Struttura e sistema di alimentazione dei vulcanien
dc.description.journalTypeJCR Journalen
dc.contributor.authorGuzmán, S.en
dc.contributor.authorStrecker, M. R.en
dc.contributor.authorMartí, J.en
dc.contributor.authorPetrinovic, I. A.en
dc.contributor.authorSchildgen, T. F.en
dc.contributor.authorGrosse, P.en
dc.contributor.authorMontero-López, C.en
dc.contributor.authorNeri, Marcoen
dc.contributor.authorCarniel, R.en
dc.contributor.authorHongn, F. D.en
dc.contributor.authorMuruaga, C.en
dc.contributor.authorSudo, M.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italiaen
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
item.fulltextWith Fulltext-
item.openairetypearticle-
item.grantfulltextrestricted-
crisitem.author.deptInstituto de Bio y Geociencias del NOA (IBIGEO), UNSa, CONICET, Salta, Argentina-
crisitem.author.deptInstitute of Earth Sciences Jaume Almera, ICTJA-CSIC, Barcelona, Spain-
crisitem.author.deptUniversitat Potsdam, Potsdam, Germany-
crisitem.author.deptInstituto de Bio y Geociencias del NOA (IBIGEO), UNSa, CONICET, Salta, Argentina-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia-
crisitem.author.deptUniversità di Udine - Italy-
crisitem.author.orcid0000-0003-3632-2960-
crisitem.author.orcid0000-0002-6721-6653-
crisitem.author.orcid0000-0002-5890-3398-
crisitem.author.orcid0000-0001-8391-2512-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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