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Abstract:

Palaeomagnetic data from 77 hand samples collected in sequences of marine sediments of Late Precambrian age (709 ± 24 Myr) exposed at two zones (Olavarría—Sierras Bayas and Barker) in central Argentina (37.3° S 59.8° W, La Tinta Formation) are given. After thermal cleaning and chemical leaching, the samples show normal and reversed polarity and yield a palaeomagnetic pole at 300.9° E 79.3° S (α95=4.8°). The position of this pole supports the interpretation that Gondwana was a unit in Late Precambrian times and is consistent with the Late Precambrian glaciation (Marinoan) of south‐eastern Australia. The direction and polarity of the stable RM of samples and the change of direction of the stable RM for adjacent samples along a sequence are used to correlate La Tinta rocks within a zone and between the two zones. Copyright © 1980, Wiley Blackwell. All rights reserved

Registro:

Documento: Artículo
Título:Palaeomagnetism of Upper Precambrian rocks of the La Tinta Formation, Argentina
Autor:Valencio, D.A.; Sinito, A.M.; Villas, J.F.
Filiación:Departamento de Cìencìas Geológìcas, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Ciudad Universitarìa, Pabellón 2, Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas
Departamento de Ciencias Geológicas, Universidad de Buenos Aires
Consejo Nacional de Investigaciones Científicas Y Técnicas, Argentina
Año:1980
Volumen:62
Número:3
Página de inicio:563
Página de fin:575
DOI: http://dx.doi.org/10.1111/j.1365-246X.1980.tb02591.x
Título revista:Geophysical Journal of the Royal Astronomical Society
Título revista abreviado:Geophys. J. Int.
ISSN:00168009
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00168009_v62_n3_p563_Valencio

Referencias:

  • Amos, A.J., Quartino, B.J., Zardini, R., El ‘Grupo La Tinta’ (Provincia de Buenos Aires, Argentina) Paleozoico o Precámbrico (1972) Anais do XXV Congreso Brasileiro de Geología, pp. 211-221. , San Pablo
  • Bonhomme, M.G., Cingolani, C.A., (1978), p. 45. , First isotopic dating of Upper Precambrian sediments in the Province of Buenos Aires, Argentina, Short Papers on the Fourth International Conference; Geochronology, Cosmochronology, Isotope Geology, Colorado, USA, Geological Survey Open‐File Report 78–101; Dalla Salda, L., Nama and La Tinta Groups – a common Southern Africa‐Argentine basin (1979) 16th Annual Report Chamber of Mines, Precambrian Research Unit, , University of Cape Town
  • Du Toit, A., (1927), p. 381. , A geological comparison of South America with South Africa with paleontological contribution, F. R. Cowper Reed, Wash. Publs Carneg. Inst; Fisher, R.A., Dispersion on a sphere (1953) Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 217, pp. 295-305
  • Marchese, H.G., Di Paola, E.C., Miogeosinclinal Tandil (1975) Revista Asoc. geol. Argent., 30, pp. 161-179
  • McElhinny, M.W., Embleton, B.J.J., Precambrian and Early Palaeozoic palaeomagnetism in Australia (1976) Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 280, pp. 417-431
  • Rapela, C.W., Dalla Salda, L.H., Cingolani, C.A., Un intrusivo básico ordovícico en la'Formación La Tinta' (Sierra de los Barrientos, Provincia de Buenos Aires, Argentina) (1974) Revista Asoc. geol. Argent., 29, pp. 319-331
  • Roy, J.L., Park, J.K., The magnetization process of certain red beds: vector analysis of chemical and thermal results (1974) Canadian Journal of Earth Sciences, 11, pp. 437-471
  • Valencio, D.A., Paleogeografía del Gondwana a partir de los datos paleomagnéticos (1973) II Contreso Latinoamericano de Geología, 1 Tomo, pp. 162-195. , Caracas, Venezuela
  • Valencio, D.A., Vilas, J.F., Mendía, J.E., Palaeomagnetism of a sequence of red beds of the Middle and Upper Sections of Paganzo Group (Argentina) and the correlation of Upper Palaeozoic‐Lower Mesozoic rocks (1977) Geophysical Journal International, 51, pp. 59-74
  • Valencio, D.A., Vilas, J.F., Mendía, J.E., Palaeomagnetism and K‐Ar ages of Lower Ordovician and Upper Silurian‐Lower Devonian rocks from north‐western Argentina (1980) Geophys. J. R. astr. Soc., 62, pp. 27-44
  • Vilas, J.F., Valencio, D.A., Palaeomagnetism and K‐Ar age of the Upper Ordovician Alcaparrosa Formation, Argentina (1978) Geophysical Journal International, 55, pp. 143-154
  • Vilas, J.F., Valencio, D.A., Palaeomagnetism of South American rocks and the Gondwana Continent (1978) Fourth Int. Gondwana Symp., 2, pp. 923-930. , Calcutta, Papers
  • Zalba, P.E., Estudio Geológico‐mineralógico de los yacimientos de arcilla de la zona de Barker, Partido de Suarez (1977) Provincia de Buenos Aires y su importancia económica, , Thesis, Universidad de La Plata

Citas:

---------- APA ----------
Valencio, D.A., Sinito, A.M. & Villas, J.F. (1980) . Palaeomagnetism of Upper Precambrian rocks of the La Tinta Formation, Argentina. Geophysical Journal of the Royal Astronomical Society, 62(3), 563-575.
http://dx.doi.org/10.1111/j.1365-246X.1980.tb02591.x
---------- CHICAGO ----------
Valencio, D.A., Sinito, A.M., Villas, J.F. "Palaeomagnetism of Upper Precambrian rocks of the La Tinta Formation, Argentina" . Geophysical Journal of the Royal Astronomical Society 62, no. 3 (1980) : 563-575.
http://dx.doi.org/10.1111/j.1365-246X.1980.tb02591.x
---------- MLA ----------
Valencio, D.A., Sinito, A.M., Villas, J.F. "Palaeomagnetism of Upper Precambrian rocks of the La Tinta Formation, Argentina" . Geophysical Journal of the Royal Astronomical Society, vol. 62, no. 3, 1980, pp. 563-575.
http://dx.doi.org/10.1111/j.1365-246X.1980.tb02591.x
---------- VANCOUVER ----------
Valencio, D.A., Sinito, A.M., Villas, J.F. Palaeomagnetism of Upper Precambrian rocks of the La Tinta Formation, Argentina. Geophys. J. Int. 1980;62(3):563-575.
http://dx.doi.org/10.1111/j.1365-246X.1980.tb02591.x