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Volcanología y geocronología de extensos flujos basálticos neógeno cuaternarios del sureste de Payenia, centro-oeste de Argentina

Volcanology and geochronology of very long Neogene-Quaternary basaltic flows from southeast Payenia, central-west Argentina

dc.contributores-ES
dc.contributoren-US
dc.creatorBernardi, Mauro Ignacio
dc.creatorBertotto, Gustavo Walter
dc.creatorOrihashi, Yuji
dc.creatorSumino, Hirochika
dc.creatorPonce, Alexis Daniel
dc.date2019-09-30
dc.identifierhttp://www.andeangeology.cl/index.php/revista1/article/view/V46n3-3181
dc.identifier10.5027/andgeoV46n3-3181
dc.descriptionLas coladas de lava basáltica consideradas en este estudio, se encuentran localizadas en el sureste de la provincia volcánica de Payenia, Argentina, y presentan longitudes variables entre 40 y 181 km. Estas exhiben secciones transversales caracterizadas por cortezas vesiculares externas que envuelven un núcleo masivo portador de estructuras vesiculadas por lo que fueron definidas como flujos pahoehoe de tipo P. En base a su topografía superficial se establecieron 2 tipos de flujos: laminares y hummocky. Los primeros se emplazaron a través de inflación y coalescencia lateral de lóbulos en el frente del flujo, dando lugar a coladas de techos planos y gran amplitud lateral. Los segundos exhiben un microrelieve otorgado por estructuras de inflación local (e.g., túmulos). Se propone que las coladas se emplazaron inicialmente como flujos laminares bajo un régimen de altas tasas de efusión sobre pendientes de bajo ángulo (es-ES
dc.descriptionThe basaltic lava flows located in the southeast of Payenia Volcanic Province, Argentina, show lengths between 40 and 181 km. These flows have transversal sections characterized by external vesicular crusts that surround a massive core hosting vesiculated structures. These characteristics defined them as P-type pahoehoe flows. Based on their surface topography, 2 types of flows were determined: sheet flows and hummocky flows. The first were emplaced through inflation and lateral coalescence of lobes in the front of the flow, giving rise to flat roofs and large lateral width. The second ones exhibit a microrelief given by local inflation structures (e.g., tumuli). It is proposed that the lava flows were initially emplaced as sheet flows on low angle slopes (en-US
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dc.publisherServicio Nacional de Geología y Mineríaen-US
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dc.rightsCopyright (c) 2019 Andean Geologyen-US
dc.sourceAndean Geology; Vol 46, No 3 (2019); 490-525es-ES
dc.sourceAndean Geology; Vol 46, No 3 (2019); 490-525en-US
dc.source0718-7106
dc.source0718-7092
dc.subjectBasalto; Retroarco; K-Ar; Payeniaes-ES
dc.subjectBasalt; Back-Arc; K-Ar; Payeniaen-US
dc.titleVolcanología y geocronología de extensos flujos basálticos neógeno cuaternarios del sureste de Payenia, centro-oeste de Argentinaes-ES
dc.titleVolcanology and geochronology of very long Neogene-Quaternary basaltic flows from southeast Payenia, central-west Argentinaen-US
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typees-ES
dc.typeen-US


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