The magnetic record of the Late Glacial-Holocene transition in sediments from Grandfather Lake (Southwest Alaska)
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Resumen
Las mediciones preliminares de propiedades magnéticas en muestras de un núcleo de 8.5 m. de longitud del lago Granfather (suroeste de Alaska), indican que la magnetización remanente de estos sedimentos reside en magnetita con comportamiento de multidominio y grano grueso. Esto sugiere una señal magnética de cristal. El cambio abrupto en las propiedades magnéticas a 5.95 m de profundidad (ca. 9500 14C años), es probablemente el reflejo del comienzo del Holoceno templado. Los registros magnéticos y de polen muestran un patrón diferente bajo esta transición. Ello sugiere la ocurrencia de un ligero calentamiento al término de la última glaciación, seguido por el evento de enfriamiento Younger Dryas y el inicio del Holoceno. El primer evento de calentamiento y el Younger Dryas no están registrados en la señal magnética. Una explicación a esta discrepancia es que el impacto de estos eventos climáticos, si es que tuvieron algún efecto en el clima del suroeste de Alaska, es que fue limitado en esta región.
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