IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
ROCK MAGNETIC STUDIES FROM THE RIO VALDEZ PALEOLAKE OUTCROUP (TIERRA DEL FUEGO, ARGENTINA): PRELIMINARY RESULTS
Autor/es:
MARIA DE BERNARDI; CLAUDIA S. G. GOGORZA; MARIA J. ORGEIRA; ANDREA CORONATO; DIEGO QUIROGA
Lugar:
Montevideo
Reunión:
Congreso; Latinmag 2013; 2013
Institución organizadora:
Latinmag
Resumen:
ABSTRACTWe present preliminary results of a rock-magnetic study from a group of pilot samples collected along a sedimentary sequence called Río Valdez paleolake in central Tierra del Fuego Island, Southernmost Argentina. The aim of this work is to characterize these sediments in order to carry out future paleomagnetic and paleoclimatic studies, which are scarce in this region (Gogorza et al., 2012, 2013; Lisé-Pronovost et al., 2013). The results mainly include measurements of magnetic susceptibility in low and high frequency, natural remanence magnetization (NRM), isothermal remanent magnetization (IRM), saturation isothermal remanent magnetization (SIRM), back field and anhysteretic remanent magnetization at 100 mT (ARM). Associated parameters (ARM/k, SIRM/ARM and SIRM/k) were calculated. Additionally, we present results of magnetic NRM parameters measured with vibrating sample magnetometer (VSM). It was found that the main carrier of remanence is magnetite with the presence of hematite in very low percentage; also greigite was observed in a layer at the upper part of the sequence.