Holocene tephrochronology of the southernmost part (42°30'-45°S) of the Andean Southern Volcanic Zone
Tefrocronologia holocena de la parte mas austral (42°30'-45°S) de la Zona Volcanica Andina del Sur.
| dc.contributor | en-US | |
| dc.contributor | es-ES | |
| dc.creator | Naranjo, Jose A. | |
| dc.creator | Stern, Charles R. | |
| dc.date | 2010-06-29 | |
| dc.identifier | http://www.andeangeology.cl/index.php/revista1/article/view/V31n2-a03 | |
| dc.identifier | 10.5027/andgeoV31n2-a03 | |
| dc.description | Tephra deposits exposed in road-cuts in both Chile and Argentina between approximately 42°30' to 45°S preserve evidence of four small (VEI <3 and volume <0.15 km3) and seven medium size (VEI = 3-5 and volume between 0.15 to 1 km3), or possibly larger, explosive Holocene eruptions of seven of the eight stratovolcanoes in this southernmost segment of the Andean Southern Volcanic Zone (SVZ). These eruptions include one from the Chaitén volcano at approximately 9,370 BP, two from the Michinmahuida volcano occurring at <6,350 BP and <3,820 BP, three from the Corcovado volcano with the oldest one occurring sometime between <9,190 and >7,980 BP and the two younger ones at <7,980 BP and <6,870 BP, one from the Yanteles volcano at <9,190, two from the Melimoyu volcano occurring at <2,740 BP and <1,750 BP, one from the Mentolat volcano at <6,960, and one from the Macá volcano at approximately <1,540 BP. The principal orientation, to the east, of the tephra plumes produced by these Holocene explosive eruptions in this arc segment, indicates a possible impact for future explosive eruptions on aeronavigation routes in Argentinean Patagonia. The total of eleven small and medium size explosive eruptions over a period of about 8,000 years implies a frequency of one eruption approximately every 725 years in this segment of the Andean SVZ, with each of the eight volcanoes having produced on the average 1.4 eruptions during the Holocene. This is about as frequent as for similar size eruptions from individual volcanic centers further north in the SVZ. In contrast, the Hudson volcano, the southernmost volcano in the SVZ, located just north of the Chile Rise-Trench triple junction at 46°S, has had three very large and nine other documented small explosive Holocene eruptions, and thus both larger and more numerous explosive Holocene eruptions than all the other centers in the southernmost SVZ combined. Hudson volcano may be significantly more active than the other centers in the southernmost SVZ because of its location close to the triple junction. | en-US |
| dc.description | Los depositos de tefra expuestos en los cortes de caminos entre aproximadamente 42°30' y los 45°S, tanto en Chile como en Argentina, muestran evidencias de cuatro niveles de erupciones explosivas holocenas de magnitud pequeña (IEV <3 y volumen <0,15 km3) y siete de tamaño mediano o mayor (IEV = 3-5 y volumen entre 0,15 y 1 km3). Dichos niveles se generaron en siete de los ocho estratovolcanes en este segmento austral de la Zona Volcanica de los Andes del Sur (ZVS). Estos niveles incluyen uno del volcan Chaiten de aproximadamente 9.370 AP, dos del volcan Michinmahuida originado a <6.350 AP y <3.820 AP, tres del volcan Corcovado, de las cuales, la mas antigua ocurrio entre <9.190 y 7.980 AP y las dos mas jovenes <7.980 AP y <6.870 AP, una del volcan Yanteles de <9.190 AP, dos del volcan Melimoyu ocurrida entre <2.740 AP y <1.750 AP, una del volcan Mentolat aproximadamente <6.960 AP y una del volcan Maca ocurrida <1.540 AP. La orientacion principalmente al este de la dispersion de las plumas de erupciones explosivas en el segmento estudiado, indica que futuras erupciones tendrian un impacto directo en las rutas de aeronavegacion en la Patagonia Argentina. Un total de once erupciones explosivas de magnitud menor a media en un periodo de 8.000 años implica una frecuencia de aproximadamente una erupcion cada 725 años en este segmento de los Andes del sur (ZVS), con un promedio de 1,4 eventos explosivos para cada uno de los ocho volcanes durante el Holoceno. Esta frecuencia para erupciones de similar tamaño es semejante a la obtenida en cada volcan hacia el norte dentro de la ZVS. Contrasta con esta cifra, sin embargo, la frecuencia de erupciones explosivas ocurridas en el Hudson, el volcan mas austral en la ZVS, ubicado inmediatamente al nortedel Dorsal de Chile-Fosa de la conjuncion triple a los 46°S, el cual ha tenido tres erupciones explosivas muy grandes y nueve eventos explosivos menores documentados durante el Holoceno. Esta caracteristica lo convierte en el volcan que ha tenido las erupciones explosivas mas grandes y numerosas del segmento austral de la ZVS. Debido a su ubicacion cerca de la conjuncion triple, el volcan Hudson podria ser significativamente mas activo que otros centros en la parte sur de la ZVS. | 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-a03/605 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V31n2-a03/html | |
| dc.source | Andean Geology; Vol 31, No 2 (2004); 225-240 | es-ES |
| dc.source | Andean Geology; Vol 31, No 2 (2004); 225-240 | en-US |
| dc.source | 0718-7106 | |
| dc.source | 0718-7092 | |
| dc.title | Holocene tephrochronology of the southernmost part (42°30'-45°S) of the Andean Southern Volcanic Zone | en-US |
| dc.title | Tefrocronologia holocena de la parte mas austral (42°30'-45°S) de la Zona Volcanica Andina del Sur. | es-ES |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | es-ES | |
| dc.type | en-US |
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Andean Geology
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