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Relative palaeointensity and reservoir effect on Lake Esmeralda, Antarctica

Published online by Cambridge University Press:  15 March 2017

M.A. Irurzun ,
M.A.E. Chaparro Open the ORCID record for M.A.E. Chaparro [Opens in a new window] ,
A.M. Sinito ,
C.S.G. Gogorza ,
H. Nuñez ,
N.R. Nowaczyk  and
H.N. Böhnel
M.A. Irurzun*
Affiliation:
Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CIFICEN) – UNCPBA – CONICET – CICPBA, Pinto 399, (7000) Tandil, Argentina
M.A.E. Chaparro
Affiliation:
Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CIFICEN) – UNCPBA – CONICET – CICPBA, Pinto 399, (7000) Tandil, Argentina
A.M. Sinito
Affiliation:
Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CIFICEN) – UNCPBA – CONICET – CICPBA, Pinto 399, (7000) Tandil, Argentina
C.S.G. Gogorza
Affiliation:
Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CIFICEN) – UNCPBA – CONICET – CICPBA, Pinto 399, (7000) Tandil, Argentina
H. Nuñez
Affiliation:
Instituto Antártico Argentino, Cerrito 1248, (1010) Buenos Aires, Argentina
N.R. Nowaczyk
Affiliation:
GeoForschungsZentrum Potsdam, Section 3.3, Telegrafenberg, D-14473 Potsdam, Germany
H.N. Böhnel
Affiliation:
Centro de Geociencias-UNAM, Boulevard Juriquilla No. 3001, (76230) Querétaro, México
*
[email protected]
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Abstract

Four cores from the bottom sediments of Lake Esmeralda, Vega Island, Antarctica (60°48'S, 57°37'W) were studied. Analysis of rock magnetics indicates that the main carriers of magnetization are ferrimagnetic minerals, predominantly pseudo-single-domain (titano-) magnetite with a small proportion of paramagnetic and antiferromagnetic minerals. The magnetic grain size of the samples is in the range of 1–5 μm and the variation of the interparametric ratios is less than one order of magnitude. Demagnetization of the natural remanent magnetization shows a stable remanent magnetization in most of the samples. Thus, the samples fulfil the necessary conditions to calculate relative palaeointensity (RPI) and the curves obtained correlated with global models enabling dating of the cores. The 250 cm of sediment recovered spans the last 10 200 yr bp. Finally, some samples with high organic matter content were dated by accelerator mass spectrometry 14C. By comparison with the age defined by the RPI curves, a reservoir effect of c. 5200 years is suggested for this region of Vega Island.

Keywords

datinglake sedimentsmagnetic propertiespalaeomagnetism
Type
Earth Sciences
Information
Antarctic Science , Volume 29 , Issue 4 , August 2017 , pp. 356 - 368
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Copyright
© Antarctic Science Ltd 2017 

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