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Artículo

A high resolution paleoclimate record for the last 4800 cal. years B.P. on Lake La Brava SE Pampa plains, Argentina

Irurzun, Maria AliciaIcon ; Gogorza, Claudia SusanaIcon ; Sinito, Ana MariaIcon ; Chaparro, Marcos Adrián EduardoIcon ; Prieto, Aldo RaulIcon ; Laprida, CeciliaIcon ; Lirio, Juan M.; Navas, Ana M.; Nuñez, Héctor
Fecha de publicación: 11/2014
Editorial: Elsevier
Revista: Geofísica Internacional
ISSN: 0016-7169
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geografía Física

Resumen

Climatic changes are reflected in variations of different parameters. Sequences of lake sediments are good sources of this information because they provide continuous and detailed records of palaeoclimatic changes. In order to determine the changes in climate in SE Pampas plain,in this paper we present a series of rock magnetic studies performed on a bottom core collected from Lake La Brava (Argentina). In order to establish lake level variations, we also measure total sulphur, organic and inorganic carbon (TS, TOC and TIC) content,alkaline elements, light and heavy metals and changes in vegetation communities. Five radiocarbon age determinations were made from samples of organic-rich clay and calibrated ages were calculated. The averaged sediment accumulation rate is 1.3 mm/yr and the sequence represents a temporal extent of about 4800 calibrated years before the present (cal. BP). The main aim was to reconstruct the hydrological balance of the lake, the changes in erosional strength and sediment supply within the catchment area since the Middle Holocene, and to explore the extent to which these may be linked to changes in climate and/or human activities.The results of this work and previous studies suggest periodic changes from cooler to warmer and humid conditions. Relationships between submerged and emergent plants are consistent with the behaviour of magnetic susceptibility.TOC changes suggest wet environment during magnetic enhancement. Floods and lower lake level events were identified in detail. Changes in sediment contribution and depositional processes for the last 50 cal. BP are caused by human impact, particularly by the use of natural resources.
Palabras clave: Paleoclimatic Changes , Rock Magnetism , Sediment Cores , South America , Lake Level , Dry Events
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/7633
URL: http://www.sciencedirect.com/science/article/pii/S0016716914700728
DOI: http://dx.doi.org/10.1016/S0016-7169(14)70072-8
Colecciones
Articulos(CIFICEN)
Articulos de CENTRO DE INV. EN FISICA E INGENIERIA DEL CENTRO DE LA PCIA. DE BS. AS.
Articulos(IDEAN)
Articulos de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Articulos(IIMYC)
Articulos de INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Citación
Irurzun, Maria Alicia; Gogorza, Claudia Susana; Sinito, Ana Maria; Chaparro, Marcos Adrián Eduardo; Prieto, Aldo Raul; et al.; A high resolution paleoclimate record for the last 4800 cal. years B.P. on Lake La Brava SE Pampa plains, Argentina; Elsevier; Geofísica Internacional; 53; 4; 11-2014; 365-383
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