Evolution of Parinacota volcano, Central Andes, Northern Chile
La evolucion del volcan Parinacota, Andes Centrales, norte de Chile.
| dc.contributor | en-US | |
| dc.contributor | es-ES | |
| dc.creator | Clavero R., Jorge E. | |
| dc.creator | Sparks, Stephen J. | |
| dc.creator | Polanco, Edmundo | |
| dc.creator | Pringle, Malcolm | |
| dc.date | 2010-06-29 | |
| dc.identifier | http://www.andeangeology.cl/index.php/revista1/article/view/V31n2-a09 | |
| dc.identifier | 10.5027/andgeoV31n2-a09 | |
| dc.description | Parinacota is an active composite stratovolcano located in the Central Andes of Northern Chile (18°S). During its earlier stage (Parinacota 1 unit, Late Pleistocene, 300-70? ka) rhyolitic to andesitic magmas were erupted, forming a voluminous lava-dome complex with its associated pyroclastic fans (mainly block-and-ash flow deposits), essentially deposited towards the Upper Lauca basin (West). It later evolved to a steep-sided composite stratocone (Parinacota 2 unit, Late Pleistocene-Holocene, 70?-8 ka), mainly formed by andesitic lava flows and scoria tephra fallout deposits.Around 8 ka ago the ancestral Parinacota volcano, built during Parinacota 1 and 2, partially collapsed towards the west, in a single and catastrophic event generating the outstanding Parinacota Debris Avalanche deposit.Soon after the collapse a new stratocone started to build with the emission of andesitic lava flows and pyroclastic flows, and their associated fallout deposits (Parinacota 3 unit, Holocene, <8 ka). Some lahars mainly directed towards the south, west and east have also been generated during Parinacota 3. Contemporaneously with the formation of the central cone, a series of flank cones and their associated basaltic andesite to andesitic lava flows were formed (Ajata centres, 6-1.4 ka). These centres erupted through two fractures, NNE and NS oriented, in the south-western flank of the volcano. The new cone (Parinacota 3 unit) has an estimated minimum volume of 18 km3, giving a minimum eruption rate of 2.25 km3 ka-1 for the last 8,000 years, which means that Parinacota volcano must be considered one of the most active volcanoes in the Central Andes of Northern Chile during the Holocene. | en-US |
| dc.description | El volcan Parinacota es un estratovolcan activo ubicado en los Andes Centrales del norte de Chile (18°S). Durante su primera etapa de evolucion (Unidad Parinacota 1, Pleistoceno Superior, 300-70? ka) emitio magmas de composicion riolitica a andesitica, formando un voluminoso complejo de lavas-domo con abanicos piroclasticos asociados (esencialmente depositos de bloques y ceniza), distribuidos principalmente hacia la parte superior de la cuenca del rio Lauca (oeste). Posteriormente, evoluciono a un estratocono compuesto, de fuertes pendientes (Unidad Parinacota 2, Pleistoceno-Holoceno, 70?-8 ka), formado principalmente por lavas y depositos de caida andesiticos. Aproximadamente hace 8 ka el volcan Parinacota ancestral, construido durante las unidades Parinacota 1 y 2, colapso parcialmente hacia el oeste, en un evento unico y catastrofico generando el Deposito de Avalancha de Parinacota. Poco tiempo despues del colapso comenzo a edificarse un nuevo estratocono a traves de la emision de lavas y flujos piroclasticos andesiticos, con depositos de caida asociados (Unidad Parinacota 3, Holoceno, <8 ka). Lahares dirigidos esencialmente hacia el sur, oeste y este tambien han sido generados en el Holoceno. Contemporaneamente con la edificacion del nuevo cono, se formo una serie de conos de piroclastos de flanco y lavas andesitico-basalticas asociadas (volcanes de Ajata, 6-1,4 ka). Estos centros aprovecharon fracturas de orientacion NNE y NS ubicadas en el flanco suroeste del volcan. El nuevo cono (Unidad Parinacota 3) tiene un volumen estimado de 18 km3, lo que resulta en una tasa eruptiva de 2,5 km3 ka-1 en los ultimos 8.000 años. Esto significa que el volcan Parinacota debe ser considerado uno de los mas activos de los Andes Centrales del Norte de Chile en el Holoceno. | es-ES |
| dc.format | application/pdf | |
| dc.format | text/html | |
| dc.language | eng | |
| dc.publisher | Servicio Nacional de Geología y Minería | en-US |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V31n2-a09/617 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V31n2-a09/html | |
| dc.source | Andean Geology; Vol 31, No 2 (2004); 317-348 | es-ES |
| dc.source | Andean Geology; Vol 31, No 2 (2004); 317-348 | en-US |
| dc.source | 0718-7106 | |
| dc.source | 0718-7092 | |
| dc.title | Evolution of Parinacota volcano, Central Andes, Northern Chile | en-US |
| dc.title | La evolucion del volcan Parinacota, Andes Centrales, norte de Chile. | es-ES |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | es-ES | |
| dc.type | en-US |
This item appears in the following Collection(s)
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Andean Geology
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