High-resolution paleomagnetic records from Laguna Potrok Aike (Patagonia, Argentina) for the last 16,000 years

C. S. G. GOGORZA; IRURZUN, M.A.; A. M. SINITO; A. LISÉ-PRONOVOST; G. ST-ONGE; T. HABERZETTL; C. OLHENDORF; KASTNER, S.; B. ZOLITSCHKA

Tandil

Congreso; Segunda Reunión Bienal de la Asociación Latinoamericana de Paleomagnetismo y Geomagnetismo (LatinMag).; 2011

LatinMag/UNCPBA

Holocene and Late-glacial records documenting variations in direction and intensity of the geomagnetic field during the last 16,000 cal. BP are presented for Southern Patagonia. This continuous high-resolution terrestrial record from Laguna Potrok Aike (51°58`S, 70°23`W) was recovered within the SALSA (South Argentinean Lake Sediment Archives and modeling) project. Mineral magnetic measurements indicate that pseudo single-domain magnetite is the major carrier of the remanence allowing the reliable definition of stable natural remanent magnetization inclinations and declinations from alternating field demagnetization and principal component analysis. Paleomagnetic secular variation records reveal many of the familiar features of declination and inclination that have previously been recorded in other records from South Argentina but conspicuous centennial-scale differences are also observed. The results illustrate the potential of PSV records for dating sedimentary sequences in southern South America.