Paleosecular variations 0-19,000 years recorded by sediments from Escondido Lake (Argentina)

Paleomagnetic and sedimentological studies carried out on four cores, about 11 m long, from the bottom sediments of Escondido Lake (southwestern Argentina) are described. This lake is geologically related to the set of lakes of glacial origin located in western Patagonia. Using several magnetic stud...

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Autor principal: Gogorza, Claudia Susana Gabriela
Otros Autores: Sinito, Ana María, Lirio, J.M, Nuez, H., Chaparro, M., Vilas, J.F
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2002
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100 1 |a Gogorza, Claudia Susana Gabriela 
245 1 0 |a Paleosecular variations 0-19,000 years recorded by sediments from Escondido Lake (Argentina) 
260 |c 2002 
270 1 0 |m Gogorza, C.S.G.; IFAS, Universidad Nacional del Centro, CONICET, Pinto 399, Tandil 7000, Argentina; email: cgogorza@exa.unicen.edu.ar 
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504 |a Turner, G.M., Thompson, R., Lake sediment record of the geomagnetic secular variation in Britain during Holocene time (1981) Geophys. J. R. Astronom. Sco, 54, pp. 703-725 
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506 |2 openaire  |e Política editorial 
520 3 |a Paleomagnetic and sedimentological studies carried out on four cores, about 11 m long, from the bottom sediments of Escondido Lake (southwestern Argentina) are described. This lake is geologically related to the set of lakes of glacial origin located in western Patagonia. Using several magnetic studies, the predominance of pseudo-single/single domain magnetite as main carrier, as well as an increase of concentration and grain size with depth was determined. The pairs of magnetic susceptibility and intensity of remanent magnetization profiles show a good correlation with the sedimentological macroscopic descriptions, and also with those of shorter cores previously studied. The stability of the natural remanent magnetization was investigated by alternating-field demagnetization. Within-lake correlation was based on lithology, magnetic susceptibility and intensity of remanent magnetization, because the patterns of these parameters showed similarity for every core. Radiocarbon dating suggests higher deposition rates during the early stage of the lacustrine basin (Late Pleistocene). The transfer function depth-age also allowed constructing a secular variation record from south Argentina for the past 19,000 years. The declination and inclination logs show some anomalous directions at about 18,000 calibrated years. © 2002 Elsevier Science B.V. All rights reserved.  |l eng 
593 |a IFAS, Universidad Nacional del Centro, Pinto 399, 7000 Tandil, Argentina 
593 |a CONICET, Rivadavia 1917, 1033 Buenos Aires, Argentina 
593 |a Instituto Antártico Argentino, Cerrito 1248, Buenos Aires, Argentina 
593 |a Fac. Cs. Exactas y Naturales, UBA, Ciudad Universitaria, 1428 Buenos Aires, Argentina 
651 4 |a ARGENTINA 
690 1 0 |a ESCONDIDO LAKE 
690 1 0 |a PALEOMAGNETIC 
690 1 0 |a PALEOSECULAR 
690 1 0 |a SEDIMENTOLOGICAL 
690 1 0 |a LACUSTRINE DEPOSIT 
690 1 0 |a MAGNETIC SUSCEPTIBILITY 
690 1 0 |a PALEOMAGNETISM 
690 1 0 |a REMANENT MAGNETIZATION 
690 1 0 |a SECULAR VARIATION 
700 1 |a Sinito, Ana María 
700 1 |a Lirio, J.M. 
700 1 |a Nuez, H. 
700 1 |a Chaparro, M. 
700 1 |a Vilas, J.F. 
773 0 |d 2002  |g v. 133  |h pp. 35-55  |k n. 1-4  |p Phys. Earth Planet. Inter.  |x 00319201  |w (AR-BaUEN)CENRE-18  |t Physics of the Earth and Planetary Interiors 
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