Abstract

ACHAGA, Romina; GOGORZA, Claudia Susana Gabriela; IRURZUN, María Alicia  and  GOGUITCHAICHVILI, Avto. Paleomagnetic and rock magnetic studies in short sediment cores from Laguna Azul, Argentina. Bol. Soc. Geol. Mex [online]. 2024, vol.76, n.3.  Epub Dec 31, 2024. ISSN 1405-3322.  https://doi.org/10.18268/bsgm2024v76n3a200424.

This study presents the first paleomagnetic and rock magnetic results from sediment cores collected in Laguna Azul, located in the Somuncurá Plateau region in Argentina. The main objective is to characterize the magnetic properties of the sediments and provide thefirst paleomagnetic directional data in this region. The primary magnetic carrier was identified as (titano)magnetite. While radioisotope dating has not yet been obtained, a chronostratigraphic marker from a level rich in organic carbon in is used to estimate the sedimentation rate. The magnetic inclination and magnetic declination results obtained have been compared with global geomagnetic models. The obtained results suggest that Laguna Azul is a potentially valuable site for future paleomagnetic research. Additionally, a preliminary paleoenvironmental analysis was carried out for each sedimentar, unit using the rock magnetic and organic matter results.

Keywords : paleomagnetism; rock-magnetism; lake sediments; Somuncurá Plateau.

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