New archeointensity data from South Brazil and the influence of the South Atlantic anomaly in South America
| العنوان: | New archeointensity data from South Brazil and the influence of the South Atlantic anomaly in South America |
|---|---|
| المؤلفون: | Ricardo I.F. Trindade, Pedro Luís Machado Sanches, Gelvam A. Hartmann, Lúcio Menezes Ferreira, Wilbor Poletti |
| المصدر: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | 010504 meteorology & atmospheric sciences, Thermoremanent magnetization, 010502 geochemistry & geophysics, 01 natural sciences, Archaeology, South Atlantic Anomaly, PALEOMAGNETISMO, Geophysics, Earth's magnetic field, Space and Planetary Science, Geochemistry and Petrology, Earth and Planetary Sciences (miscellaneous), Gradual increase, Geology, 0105 earth and related environmental sciences |
| الوصف: | We obtained six new high-quality archeointensity results for the Pelotas city region, in South Brazil with ages ranging from 1790 to 1943 CE. Archeointensity measurements were performed with the double heating technique, including partial thermoremanent magnetization (pTRM) checks and pTRM tail-checks. Measurements were corrected from anisotropy of TRM and cooling-rate effects. Archeological sites providing successful results comprised: Charqueada Santa Barbara (1790–1838 CE; 36.4 ± 0.6 μT), Chacara da Brigada Militar (1830–1851 CE; 32.6 ± 2.9 μT), Casa Numero 08 (1878–1879 CE; 32.1 ± 3.1 μT), Colegio da Familia de Eliseu Maciel (1881–1883 CE; 28.7 ± 2.7 μT), Fundacao Simon Bolivar (1884–1889 CE; 30.1 ± 2.0 μT), Campus Porto UFPel (1942–1943 CE; 27.8 ± 2.0 μT). Two other sites did not provide meaningful results. The new data complement previous results obtained in South and Southeast Brazil, Argentina and Chile and provide additional evidence for the rapid decay of the field in the region from about 1500 to 2000 CE. In addition, they show a gradual increase in the contribution of non-dipolar components in the geomagnetic field of South America since 1800 CE, likely indicating a strengthening of the South Atlantic Anomaly over the continent from this time onward. |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a775fa6c3b3988733ce18dc7a1ad2af1 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....a775fa6c3b3988733ce18dc7a1ad2af1 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |