Preliminary paleomagnetic results of a terminal pleistocene/holocene record from northeastern Buenos Aires province (Argentina)
Paleomagnetic data from the Lomas del Mirador (34° 39.29' S, 58° 32.17' W) sedimentary section in northeastern Buenos Aires province (Argentina) comprises 149 oriented samples that record a significant but gentle gradual change in the geomagnetic field at the terminal Pleistocene and Holoc...
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2006
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03523659_v23_n2_p119_Nami http://hdl.handle.net/20.500.12110/paper_03523659_v23_n2_p119_Nami |
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paper:paper_03523659_v23_n2_p119_Nami2023-06-08T15:34:35Z Preliminary paleomagnetic results of a terminal pleistocene/holocene record from northeastern Buenos Aires province (Argentina) Argentina Holocene Paleomagnetism Paleosecular variation South America Terminal Pleistocene chronostratigraphy demagnetization geomagnetic field Holocene paleomagnetism Pleistocene remanent magnetization secular variation virtual geomagnetic pole Argentina Buenos Aires [Argentina] South America Paleomagnetic data from the Lomas del Mirador (34° 39.29' S, 58° 32.17' W) sedimentary section in northeastern Buenos Aires province (Argentina) comprises 149 oriented samples that record a significant but gentle gradual change in the geomagnetic field at the terminal Pleistocene and Holocene. Based on rock magnetic and detrital remanence experiments, the deposit seems to be a good recorder of the past geomagnetic field behavior. The characteristic remanent magnetization (ChRM), determined by progressive AF demagnetization, shows that the sections registered normal and intermediate polarities during the terminal Pleistocene/Holocene. The PSV is characterized by a large variation with ∼ 80° difference in inclination in both sections and a significant but gentle westward shift in the declination in the upper part. A similar trend was observed in the paleomagnetic record registered in other sections from northeastern Argentina. This remarkably large PSV, especially the inclination record, became a reliable chronostratigraphical marker for latest Pleistocene/Holocene sedimentary deposits in northeastern Buenos Aires. VGPs resemble those registered during terminal Pleistocene and Holocene in the southern cone of South America. Palaeomagnetic poles for the sections other contemporaneous sites from northeastern Argentina fall some ∼ 5-15° away from the Earth's rotation's axis. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03523659_v23_n2_p119_Nami http://hdl.handle.net/20.500.12110/paper_03523659_v23_n2_p119_Nami |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Holocene Paleomagnetism Paleosecular variation South America Terminal Pleistocene chronostratigraphy demagnetization geomagnetic field Holocene paleomagnetism Pleistocene remanent magnetization secular variation virtual geomagnetic pole Argentina Buenos Aires [Argentina] South America |
| spellingShingle |
Argentina Holocene Paleomagnetism Paleosecular variation South America Terminal Pleistocene chronostratigraphy demagnetization geomagnetic field Holocene paleomagnetism Pleistocene remanent magnetization secular variation virtual geomagnetic pole Argentina Buenos Aires [Argentina] South America Preliminary paleomagnetic results of a terminal pleistocene/holocene record from northeastern Buenos Aires province (Argentina) |
| topic_facet |
Argentina Holocene Paleomagnetism Paleosecular variation South America Terminal Pleistocene chronostratigraphy demagnetization geomagnetic field Holocene paleomagnetism Pleistocene remanent magnetization secular variation virtual geomagnetic pole Argentina Buenos Aires [Argentina] South America |
| description |
Paleomagnetic data from the Lomas del Mirador (34° 39.29' S, 58° 32.17' W) sedimentary section in northeastern Buenos Aires province (Argentina) comprises 149 oriented samples that record a significant but gentle gradual change in the geomagnetic field at the terminal Pleistocene and Holocene. Based on rock magnetic and detrital remanence experiments, the deposit seems to be a good recorder of the past geomagnetic field behavior. The characteristic remanent magnetization (ChRM), determined by progressive AF demagnetization, shows that the sections registered normal and intermediate polarities during the terminal Pleistocene/Holocene. The PSV is characterized by a large variation with ∼ 80° difference in inclination in both sections and a significant but gentle westward shift in the declination in the upper part. A similar trend was observed in the paleomagnetic record registered in other sections from northeastern Argentina. This remarkably large PSV, especially the inclination record, became a reliable chronostratigraphical marker for latest Pleistocene/Holocene sedimentary deposits in northeastern Buenos Aires. VGPs resemble those registered during terminal Pleistocene and Holocene in the southern cone of South America. Palaeomagnetic poles for the sections other contemporaneous sites from northeastern Argentina fall some ∼ 5-15° away from the Earth's rotation's axis. |
| title |
Preliminary paleomagnetic results of a terminal pleistocene/holocene record from northeastern Buenos Aires province (Argentina) |
| title_short |
Preliminary paleomagnetic results of a terminal pleistocene/holocene record from northeastern Buenos Aires province (Argentina) |
| title_full |
Preliminary paleomagnetic results of a terminal pleistocene/holocene record from northeastern Buenos Aires province (Argentina) |
| title_fullStr |
Preliminary paleomagnetic results of a terminal pleistocene/holocene record from northeastern Buenos Aires province (Argentina) |
| title_full_unstemmed |
Preliminary paleomagnetic results of a terminal pleistocene/holocene record from northeastern Buenos Aires province (Argentina) |
| title_sort |
preliminary paleomagnetic results of a terminal pleistocene/holocene record from northeastern buenos aires province (argentina) |
| publishDate |
2006 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03523659_v23_n2_p119_Nami http://hdl.handle.net/20.500.12110/paper_03523659_v23_n2_p119_Nami |
| _version_ |
1768546630853722112 |