info:eu-repo/semantics/article
Crater lakes of the Pali Aike Volcanic Field as key sites for paleoclimatic and paleoecological reconstructions in southern Patagonia, Argentina
Registro en:
Zolitschka, Bernd; Schäbitz, Frank; Lücke, Andreas; Corbella, Hugo; Ercolano, Bettina; et al.; Crater lakes of the Pali Aike Volcanic Field as key sites for paleoclimatic and paleoecological reconstructions in southern Patagonia, Argentina; Elsevier; Journal Of South American Earth Sciences; 21; 3; 7-2006; 294-309
0895-9811
Autor
Zolitschka, Bernd
Schäbitz, Frank
Lücke, Andreas
Corbella, Hugo
Ercolano, Bettina
Fey, Michael
Haberzettl, Torsten
Janssen, Stephanie
Maidana, Nora Irene
Mayr, Christoph
Ohlendorf, Christian
Oliva, Gabriel
Paez, Marta M.
Schleser, Gerhard H.
Soto, Julio
Tiberi, Pedro
Wille, Michael
Resumen
Sedimentary records from crater lakes are of major scientific interest because they provide continuous high-resolution climatic and environmental archives. From a limnogeological survey of crater lakes performed in the Pali Aike Volcanic Field (528S, southeastern Patagonia, Santa Cruz, Argentina), two deep crater lakes have been recognized: Laguna Potrok Aike (100 m water depth) and Laguna Azul (56 m water depth). Physicochemical analyses of these closed lake systems demonstrate that Laguna Azul has a dimictic and thermally stratified freshwater body, whereas Laguna Potrok Aike is a subsaline polymictic lake. Both have an oxygen-rich water column from top to bottom. Laguna Potrok Aike in particular is enriched in Na, P, and Cl. The morphometry suggests that Laguna Azul is of Holocene age, whereas the potential sediment infill of Laguna Potrok Aike may comprise 250 m to a mid-Pleistocene age (770 ka). Several aerial and subaquatic lake level terraces at Laguna Potrok Aike point to lake level fluctuations triggered by prior hydrological changes. Although fine-grained sediments of both lakes are not varied, they may eventually provide a detailed terrestrial record of past environmental and climatic variations for this southern mid-latitude region. Fil: Zolitschka, Bernd. Universitat Bremen; Alemania Fil: Schäbitz, Frank. Universitat Zu Köln; Alemania Fil: Lücke, Andreas. Helmholtz Gemeinschaft. Forschungszentrum Julich; Alemania Fil: Corbella, Hugo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Ercolano, Bettina. Universidad Nacional de la Patagonia Austral; Argentina Fil: Fey, Michael. Universitat Bremen; Alemania Fil: Haberzettl, Torsten. Universitat Bremen; Alemania Fil: Janssen, Stephanie. Universitat Zu Köln; Alemania Fil: Maidana, Nora Irene. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Mayr, Christoph. Helmholtz Gemeinschaft. Forschungszentrum Julich; Alemania Fil: Ohlendorf, Christian. Universitat Bremen; Alemania Fil: Oliva, Gabriel. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Patagonia Sur; Argentina Fil: Paez, Marta M.. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología. Laboratorio de Palinología y Bioantropología; Argentina Fil: Schleser, Gerhard H.. Helmholtz Gemeinschaft. Forschungszentrum Julich; Alemania Fil: Soto, Julio. Universidad Nacional de la Patagonia Austral; Argentina Fil: Tiberi, Pedro. Universidad Nacional de la Patagonia Austral; Argentina Fil: Wille, Michael. Universitat Zu Köln; Alemania