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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container_title | Physics of the earth and planetary interiors |
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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. |
doi_str_mv | 10.1016/j.pepi.2021.106768 |
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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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