Artículo
Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina
Gogorza, Claudia Susana
; Lirio, J. M.; Nuñez, H.; Chaparro, Marcos Adrián Eduardo
; Bertorello, Hector Raul
; Sinito, Ana Maria
![Icon](/themes/CONICETDigital/images/conicet.png)
![Icon](/themes/CONICETDigital/images/conicet.png)
![Icon](/themes/CONICETDigital/images/conicet.png)
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Fecha de publicación:
07/2004
Editorial:
Elsevier Science
Revista:
Physics of the Earth and Planetary Interiors
ISSN:
0031-9201
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Relative changes in geomagnetic field intensity over the last 16,000 years BP were recovered from the study of four cores obtained from Lake Escondido (South Argentina). Rock magnetic analysis shows that the main magnetic mineral is magnetite, the concentrations being mainly between 0.01 and 0.1%, and the grain size between 1 and 8_m. In order to fulfil the criteria for assessing the reliability of paleointensity data derived from sediments [Rev. Geophys. 31 (1993) 319], the samples whose concentrations and size are beyond this range were rejected. The remanent magnetisation at 20mT(NRM20mT)was normalised using the anhysteric remanent magnetisation (ARM100mT), the saturation of the isothermal remanent magnetisation (SIRM) and the low field magnetic susceptibility (k). Coherence function analysis indicates that the records are not significantly affected by local environmental conditions. This suggests that the variations in normalised remanence are mostly likely due to geomagnetic paleointensity fluctuations. ARM100mT is the best normaliser for the Lake Escondido sediments. The record of relative paleointensity (NRM20mT/ARM100mT) shows peaks and troughs whose amplitudes are similar to those in the St. Lawrence Estuary, Lake Baikal, Lake Pepin and Larsen-A Ice shelf data set and a stack of archeomagnetic data given as virtual axial dipole moment (VADM).
Palabras clave:
RELATIVE PALEOINTENSITY
,
HOLOCENE
,
SOUTH AMERICA
,
LAKE ESCONDIDO
,
COHERENCE
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Identificadores
Colecciones
Articulos(CCT - TANDIL)
Articulos de CTRO CIENTIFICO TECNOLOGICO CONICET - TANDIL
Articulos de CTRO CIENTIFICO TECNOLOGICO CONICET - TANDIL
Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Citación
Gogorza, Claudia Susana; Lirio, J. M.; Nuñez, H.; Chaparro, Marcos Adrián Eduardo; Bertorello, Hector Raul; et al.; Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina; Elsevier Science; Physics of the Earth and Planetary Interiors; 145; 1-4; 7-2004; 219-238
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