Nuevos registros de polaridad magnética en la ciudad de La Plata, Argentina
| cic.institucionOrigen | Laboratorio de Entrenamiento Multidisciplinario para la Investigación Tecnológica | es |
| cic.isFulltext | true | es |
| cic.isPeerReviewed | true | es |
| cic.lugarDesarrollo | Laboratorio de Entrenamiento Multidisciplinario para la Investigación Tecnológica | es |
| cic.parentType | Articulo | |
| cic.version | info:eu-repo/semantics/publishedVersion | es |
| dc.date.accessioned | 2021-04-27T16:41:08Z | |
| dc.date.available | 2021-04-27T16:41:08Z | |
| dc.identifier.uri | https://digital.cic.gba.gob.ar/handle/11746/10912 | |
| dc.title | Nuevos registros de polaridad magnética en la ciudad de La Plata, Argentina | es |
| dc.type | Artículo | es |
| dcterms.abstract | The results of a geological study carried out in a quarry in the city of La Plata (34°57’S - 57°53’O), Argentina, are presented. The exposed geological profile is formed by silty sediments from the Pleistocene and Holocene, which correspond mainly to the Ensenada and Buenos Aires formations, and in some sectors to the La Postrera formation. Lithological discontinuities are observed separating levels with different degrees of pedogenesis, carbonatics levels and krotovines. The behavior of the magnetic susceptibility (κ) indicates variations in the concentration of magnetic minerals that respond to changes in the relationship between the sedimentation rate and pedogenesis. With the paleomagnetic analysis the existence of magnetozones with normal and reverse polarity was determined, which were assigned to the chrons Brunhes (< 0.78 Ma) and Matuyama medium-upper (1.78 - 0.78 Ma), and to the subchrons Jaramillo (0.99 - 1.07 Ma) and Olduvai (1.92 - 1.78 Ma). The change in a polarity assigned to Matuyama / Brunhes was recorded in the Ensenada formation, both at the top of the Geosol Hisisa and at the loess base that covers this paleosol. The most reliable reverse polarity records were obtained in the least pedogenized loess levels and in the laminar structure krotovines fills that have the highest values of susceptibility and magnetic intensity. In contrast, in the Btg horizons of paleosols, with low values of susceptibility and intensity, paleomagnetic records were less reliable or did not allow determining their polarity (little or no magnetic remanence). This response is attributed to the alteration of the titanomagnetites, due to excess water in the soil, for prolonged periods of time. | en |
| dcterms.alternative | New records of magnetic polarity in the city of La Plata, Argentina | en |
| dcterms.creator.author | Rico, Yamile | es |
| dcterms.creator.author | Gómez Samus, Mauro | es |
| dcterms.creator.author | Mendoza, María S. | es |
| dcterms.creator.author | Alfonso Ariza, Ana M. | es |
| dcterms.extent | 31-54 | es |
| dcterms.identifier.other | ISSN 2250-5989 | es |
| dcterms.isPartOf.issue | no. 9 | es |
| dcterms.isPartOf.series | Ciencia y Tecnología de los Materiales | es |
| dcterms.issued | 2019 | |
| dcterms.language | Español | es |
| dcterms.license | Attribution 4.0 International (BY 4.0) | es |
| dcterms.subject | Loess | es |
| dcterms.subject | Paleosuelos | es |
| dcterms.subject | Brunhes | es |
| dcterms.subject | Matuyama | es |
| dcterms.subject | Pleistoceno | es |
| dcterms.subject.materia | Ingeniería de los Materiales | es |
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