Holocene peat and lake sediment tephra record from the southernmost Chilean Andes (53-55°S)
El registro de tefras australes holocenas en tubas y sedimentos lacustres de los Andes meridionales (53-55°S), Chile.
| dc.contributor | en-US | |
| dc.contributor | es-ES | |
| dc.creator | Kilian, Rolf | |
| dc.creator | Hohner, Miriam | |
| dc.creator | Biester, Harald | |
| dc.creator | Wallrabe-Adams, Hans J. | |
| dc.creator | Stern, Charles R. | |
| dc.date | 2010-06-29 | |
| dc.identifier | http://www.andeangeology.cl/index.php/revista1/article/view/V30n1-a02 | |
| dc.identifier | 10.5027/andgeoV30n1-a02 | |
| dc.description | Peat and lake sediment cores from Peninsula Muñoz Gamero in the southernmost Main Andean Cordillera, and also Seno Skyring fjord and Peninsula Brunswick in the Andean foothills, have been investigated to refine the local Holocene tephrochronology. New 14C ages, together with calculated peat growth and sedimentation rates, provide age constraints. The thickest (5-15 cm) tephra layer in the cores resulted from an eruption of the Mount Burney volcano at approximately 4254±120 cal. yr BP. Isopach maps for this eruption indicate deposition of approximately 2.5_3 km3 of tephra, mainly in the forested Andean area southeast of the volcano. Mount Burney had another large Plinian eruption between 9009±17 and 9175±111 cal. yr BP, and also four smaller eruptions during the Holocene. Tephra from large explosive eruptions of the Reclus (>15384±578 cal. yr BP), Hudson (between 7707±185 and 7795±131 cal. yr BP) and Aguilera (<3596±230 cal. yr BP) volcanoes also occur in some of the cores as indicated by the characteristic compositions of their tephra glass, which differ both from each other and also from that of tephra derived from Mount Burney. Significant loss of alkali elements during alteration of the volcanic glass in the tephra layers was observed, especially within acid peat soils, and this may be an important factor in the plant nutrient supply. | en-US |
| dc.description | Se han estudiado testigos de tefras y sedimentos de la peninsula Munoz Gamero con el seno Skyring y con el proposito de mejorar la tefrocronologia local. Nuevas edades 14C junto con tasas de crecimiento de las turbas y de sedimentacion, proporcionan nuevas marcas para la edad de las tefras. La capa mas gruesa de tefra (5-15 cm) se origino en una erupcion del volcan del monte Burney, a los 4,254±120 anos calibrados AP. Las isopacas de esta erupcion indican una deposicion de ca. 2,5 a 3 km3 de tefra, principalmente en el area andina forestada, al sureste del volcan. El monte Burney tuvo otra gran erupcion pliniana entre 9,009±17 y 9,175±110 anos cal. AP, y cuatro erupciones menores durante el Holoceno. Se observan, tambien, en algunos testigos tefras de las grandes erupciones de los volcanes Reclus (>15,384±578 cal. anos AP), Hudson (entre 7,707±185 y 7,795±131 cal. anos AP) y Aguilera (<3,596±230 cal. anos AP) como lo indican las composiciones caracteristicas de los vidrios de tefra, los cuales difieren entre los diferentes centros volcanicos. Se establecio una perdida significativa de los elementos alcalinos durante la alteracion del vidrio volcanico en las capas de tefra, especialmente en los testigos de suelos acidos. lo que podria ser un factor importante en el suministro de nutrientes para las plantas. | 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/V30n1-a02/543 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V30n1-a02/html | |
| dc.source | Andean Geology; Vol 30, No 1 (2003); 32-37 | es-ES |
| dc.source | Andean Geology; Vol 30, No 1 (2003); 32-37 | en-US |
| dc.source | 0718-7106 | |
| dc.source | 0718-7092 | |
| dc.title | Holocene peat and lake sediment tephra record from the southernmost Chilean Andes (53-55°S) | en-US |
| dc.title | El registro de tefras australes holocenas en tubas y sedimentos lacustres de los Andes meridionales (53-55°S), 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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