Dating of Holocene fluvial deposits in the southern Sierras Pampeanas (Argentina) by matching paleomagnetic secular variation to a geomagnetic field model
| Autor: | Claudia Gogorza, Guillermo Ojeda, Jorge O. Chiesa, Avto Goguitchaichvili, Guillermo Heider, Catriel Greco, Maria Alicia Irurzun |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010506 paleontology
Paleomagnetism Geomagnetic secular variation Natural remanent magnetization Demagnetizing field Fluvial Geology 010502 geochemistry & geophysics 01 natural sciences Magnetic susceptibility Paleontology Earth's magnetic field Remanence 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Journal of South American Earth Sciences. 106:102996 |
| ISSN: | 0895-9811 |
| DOI: | 10.1016/j.jsames.2020.102996 |
| Popis: | A 2-m long Holocene sedimentary sequence collected from a fluvial system located in the eastern piedmont of Sierra de Las Quijadas (San Luis, Argentina) was dated by comparing its paleomagnetic secular variation (PSV) record with the SHA.DIF.14 k time-varying spherical harmonic geomagnetic field model. Rock magnetic data suggest that the magnetic signal is mainly carried by low-coercivity magnetic minerals like magnetite. Low field magnetic susceptibility, used as a magnetic concentration parameter, shows a variation of about a factor of two along the profile. Progressive demagnetization experiments of the natural remanent magnetization show the presence of a stable magnetic component, and the Characteristic Remanent Magnetization directions are well defined (MAD |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect