A full-vector paleomagnetic secular variation record from 55,000 to 33,000 cal. years BP from Rio Vald acute accent ez glaciolacustrine outcrop (Tierra Del Fuego, Argentina)

High-resolution paleomagnetic investigations were performed on Rio Valdez outcrop at the Fagnano Lake, central Isla Grande de Tierra del Fuego, southernmost South America. Our aims were to develop a full-vector paleomagnetic secular variation (PSV) record and establish paleomagnetic chronostratigrap...

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Veröffentlicht in:Physics of the earth and planetary interiors 2021-09, Vol.318, Article 106768
Hauptverfasser: Palermo, Pedro, Gogorza, Claudia, Orgeira, Maria J., De Bernardi, Maria, Irurzun, Maria A., Sinito, Ana M., Sanci, Romina, Coronato, Andrea
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container_title Physics of the earth and planetary interiors
container_volume 318
creator Palermo, Pedro
Gogorza, Claudia
Orgeira, Maria J.
De Bernardi, Maria
Irurzun, Maria A.
Sinito, Ana M.
Sanci, Romina
Coronato, Andrea
description High-resolution paleomagnetic investigations were performed on Rio Valdez outcrop at the Fagnano Lake, central Isla Grande de Tierra del Fuego, southernmost South America. Our aims were to develop a full-vector paleomagnetic secular variation (PSV) record and establish paleomagnetic chronostratigraphy for the outcrop based on radiocarbon dating and the correlation of the PSV record with other dated PSV records in the region. We detected two distinct anomalous directional intervals at 35,400 and 33,800 cal. years BP and at 41,500 and 39,000 cal. years BP, which could be associated with Mono Lake and Laschamp excursions. Rock magnetic investigations revealed slight changes in concentration, mineralogy, and magnetic grain size along the sedimentary sequence, but the reconstruction of past direction and relative paleointensity variations in the geomagnetic field remained feasible. The record provides new insights into the behavior of the geomagnetic field at high latitudes in the Southern Hemisphere, about which very little is currently known.
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subjects Geochemistry & Geophysics
Physical Sciences
Science & Technology
title A full-vector paleomagnetic secular variation record from 55,000 to 33,000 cal. years BP from Rio Vald acute accent ez glaciolacustrine outcrop (Tierra Del Fuego, Argentina)
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