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Abstract:

The characteristics of the Pleistocene glaciations in Patagonia have been partially solved. On the basis of the moraine extent and the varve-counting method, and by analogy with the Weichselian Glaciation in Scandinavia, Caldenius (1932) established a pattern of Patagonian glaciations which has remained acceptable. Palaeomagnetic studies of glacial sediments have been started with the aim of testing this correlation. A 78-m Late Glacial glaciolacustrine sequence was studied and sampled at Rio Corintos, Chubut Province, Argentina (43 ° 10′ S, 71 ° 15′ W). Approximately 1089 varves were counted; they were thought to have been deposited between 25 000-13 000 years BP. The samples showed strong and stable values of remanent magnetization. Magnetite was identified as the carrier of the remanence. Magnetic susceptibility and intensity were recorded and the expected variations according to grain size were obtained. Recorded declination values oscillated from 30 ° W to 15 ° E, and inclination values from -8 ° to - 56 °. This shift can be attributed to the secular variation of the geomagnetic field. Declination and inclination values were smoothed using a stratigraphic window which covered 40 varves. Assuming that a single varve implies that one year has passed, the secular variation curve can be presented against a scale-time which spans approximately 1200 years. The corresponding VGP path showed 100% clockwise motion in the region of northern Canada. A correlation with other VGPs recorded in Lago Buenos Aires for Late Glacial varves has been established. © 1990.

Registro:

Documento: Artículo
Título:Palaeomagnetic data from Late Glacial glaciolacustrine sediments at Rio Corintos, Chubut, Argentina
Autor:Beraza, L.A.; Vilas, J.F.A.
Filiación:Laboratorio de Paleomagnetismo Daniel A. Valencio, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon 11, 1428 Buenos Aires, Argentina
Palabras clave:glaciolacustrine sediment; late glacial; Late Glacial sediment; moraine; palaeomagnetic data; palaeomagnetism; varve; Argentina, Chubut, Rio Corintos
Año:1990
Volumen:64
Número:2-4
Página de inicio:111
Página de fin:120
DOI: http://dx.doi.org/10.1016/0031-9201(90)90031-R
Título revista:Physics of the Earth and Planetary Interiors
Título revista abreviado:Phys. Earth Planet. Inter.
ISSN:00319201
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v64_n2-4_p111_Beraza

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Citas:

---------- APA ----------
Beraza, L.A. & Vilas, J.F.A. (1990) . Palaeomagnetic data from Late Glacial glaciolacustrine sediments at Rio Corintos, Chubut, Argentina. Physics of the Earth and Planetary Interiors, 64(2-4), 111-120.
http://dx.doi.org/10.1016/0031-9201(90)90031-R
---------- CHICAGO ----------
Beraza, L.A., Vilas, J.F.A. "Palaeomagnetic data from Late Glacial glaciolacustrine sediments at Rio Corintos, Chubut, Argentina" . Physics of the Earth and Planetary Interiors 64, no. 2-4 (1990) : 111-120.
http://dx.doi.org/10.1016/0031-9201(90)90031-R
---------- MLA ----------
Beraza, L.A., Vilas, J.F.A. "Palaeomagnetic data from Late Glacial glaciolacustrine sediments at Rio Corintos, Chubut, Argentina" . Physics of the Earth and Planetary Interiors, vol. 64, no. 2-4, 1990, pp. 111-120.
http://dx.doi.org/10.1016/0031-9201(90)90031-R
---------- VANCOUVER ----------
Beraza, L.A., Vilas, J.F.A. Palaeomagnetic data from Late Glacial glaciolacustrine sediments at Rio Corintos, Chubut, Argentina. Phys. Earth Planet. Inter. 1990;64(2-4):111-120.
http://dx.doi.org/10.1016/0031-9201(90)90031-R