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Volume 58 Supplement 10

Special Issue: Paleomagnetism and Tectonics in Latinamerica

A new Late Permian paleomagnetic pole for stable South America: The Independencia group, eastern Paraguay

Abstract

The Late Permian segment of the South American apparent polar wander path (APWP) is poorly defined and further paleomagnetic efforts on suitable rocks of such age from stable areas of South America are needed. A study was carried out on the Late Permian Independencia Group, which is discontinuously exposed along Eastern Paraguay and consists of several hundred meters of flat lying continental white, pink and reddish sandstones and siltstones, deposited on the western margin of the Paraná basin. Thirteen sites (83 samples) were collected on the top unit of the Group (the latest Permian Tacuary Fm) from outcrops distributed over 1000 square kms. Detailed AF and thermal demagnetization permitted the isolation of within-site consistent characteristic remanence in eleven sites, being generally hematite the main carrier of the remanence. Excluding one outlier, a paleomagnetic pole was computed by averaging 10 virtual geomagnetic poles of mixed polarities (6 reversed, 4 normal), yielding a position at: 80.7°S, 7.0°E, A95: 6.6°. The new pole may be considered key for a better definition of the South American APWP by filling a gap between a relatively reliable Early Permian and a poorly defined Early-Middle Triassic groups of poles.

References

  • Bullard, E. C., J. E. Everett, and A. G. Smith, The fit of continents around the Atlantic, Phil. Trans. Roy. Soc., 258, 41–51, 1965.

    Article  Google Scholar 

  • Conti, C. and A. E. Rapalini, Paleomagnetismo de la Formacion Choique Mahuida, aflorante en la sierra hómonima, provincia de La Pampa, República Argentina. 12th Congreso Geoógico Argentino, San Juan, Argentina, 2, 235–238. 1990.

    Google Scholar 

  • Creer, K. M., B. J. J. Embleton, and D. A. Valencio, Triassic and Permo-Triassic palaeomagnetic data for South America, Earth and Planet. Sci. Lett., 8, 173–178, 1970.

    Article  Google Scholar 

  • Embleton, B. J. J. Paleomagnetic results for the Permian of South America and a comparison with the African and Australian data, Geophys. J. R. astr. Soc., 21, 105–118. 1970.

    Article  Google Scholar 

  • Ernesto, M., New Early Triassic Paleomagnetic Pole for South America from the Alto Paraguay Alkaline Province. 2005 Joint Assembly AGU, New Orleans, USA, Abstracts: GP-41A-08, 2005.

    Google Scholar 

  • Eyles, N., A. Franca, G. Gonzalez Bonorino, C. H. Eyles, and O. López Paulsen, Hydrocarbon-bearing late Paleozoic glaciated basins of southern and central South America, American Association of Petroleum Geologists Memoir, 62, 165–183, 1995.

    Google Scholar 

  • Geuna, S. and L. D. Escosteguy, Paleomagnetism of the Upper Carboniferous—Lower Permian transition from Paganzo basin, Argentina, Geophys. J. Int., 157, 1071–1089, 2004.

    Article  Google Scholar 

  • Gradstein, F. M., J. G. Ogg, and A. G. Smith, A Geologic Time Scale 2004, Cambridge University Press, Cambridge, UK, 589 pp., 2004.

    Book  Google Scholar 

  • Hargraves, R. B. Problems in palaeomagnetic synthesis illustrated by results from Permo-Triassic dolerites in Guyana, Phys. Earth Planet. Inter., 16, 277–284, 1978.

    Article  Google Scholar 

  • Harrington, H. J., Geología del Paraguay Oriental, Universidad de Buenos Aires, Fac. Cs. Exactas y Naturales, Contribuciones Científicas, Serie E, Geología, 1, 1–88, 1950.

    Google Scholar 

  • Irving, E., Drift of the major continental blocks since the Devonian, Nature, 270, 304–309, 1977.

    Article  Google Scholar 

  • Kirschvink, J. L., The least-squares line and plane and the analysis of palaeomagnetic data, Geophys. J. R. astr. Soc., 62, 699–718, 1980.

    Article  Google Scholar 

  • Lopez Gamundi, O., I. Espejo, P. Conaghan, and C. Mc. A. Powell, Southern South America, in Permian-Triassic Pangean Basins and Fold Belts along the Panthalassan margin of western Gondwanaland, edited by J. Veevers and C. Mc. A. Powell, Geological Society of America Memoir, 184, 281–329, 1994.

    Article  Google Scholar 

  • Lottes, A. L. and D. B. Rowley, Reconstruction of the Laurasian and Gondwanan segments of Permian Pangaea, Geological Society Memoir, 12, 383–395, 1990.

    Article  Google Scholar 

  • McElhinny, M. W. and P. L. McFadden, Paleomagnetism. Continents and Oceans, Academic Press, Internat. Geophys. Series, 73, 386 pp., 2000.

    Google Scholar 

  • McFadden, P. L. and M. W. McElhinny, Classification of the reversal test in palaomagnetism, Geophys. J. Int., 103, 725–729, 1990.

    Article  Google Scholar 

  • Morel, P. and E. Irving, Paleomagnetism and the evolution of Pangea, J. Geophys. Res., 86, 1858–1872, 1981.

    Article  Google Scholar 

  • Muttoni, G., D. V. Kent, and J. E. T. Channell, Evolution of Pangea: paleomagnetic constraints from the Southern Alps, Italy, Earth. Planet. Sci. Lett., 140, 97–112, 1996.

    Article  Google Scholar 

  • Muttoni, G., D. V. Kent, E. Garzanti, P. Brack, N. Abrahamsen, and M. Gaetani, Early Permian Pangea ‘B’ to Late Permian Pangea ‘A’, Earth. Planet. Sci. Lett., 215, 379–394. 2003.

    Article  Google Scholar 

  • Orué, D. Sintese da geologia do Paraguai Oriental, com enfase para o magmatismo alcalino associado, Instituto de Geociencias, Universidad de Sao Paulo, Master Thesis, 163 pp., 1996.

    Google Scholar 

  • Pascholati, E. M. and I. G. Pacca, Estudo paleomagnético de secçoes do Sub-Grupo Itararé, 29th Cong. Brasil. Geol., Belo Horizonte, 2, 275–281, 1976.

    Google Scholar 

  • Sinito, A. M., D. A. Valencio, and J. F. Vilas, Palaeomagnetism of a sequence of Upper Palaeozoic—Lower Mesozoic red beds from Argentina, Geophys. J. R. astr. Soc., 58, 237–247, 1979.

    Article  Google Scholar 

  • Tan, X. and K. P. Kodama, Magnetic anisotropy and paleomagnetic inclination shallowing in red beds: Evidence from the Mississipian Mauch Chunk Formation, Pennsylvania, J. Geophys. Res., 107(B11), 2311, doi: 10.129/2001JB001636, EPM 9-1/9-17, 2002.

    Article  Google Scholar 

  • Tan, X., K. P. Kodama, and D. Fang, Laboratory depositional nad compaction-caused inclination errors carried by haematite and their implications in identifying inclination error of natural remanence in red beds, Geophys. J. Int., 151, 475–486, 2002.

    Article  Google Scholar 

  • Tomezzoli, R. N., Further paleomagnetic results from the Sierras Australes fold and thrust belt, Argentina, Geophys. J. Int., 147, 356–366, 2001.

    Article  Google Scholar 

  • Tomezzoli, R. N. and J. F. Vilas, Palaeomagnetic constraints on the age of deformation of the Sierras Australis thrust and fold belt, Argentina, Geophys. J. Int., 138, 857–870, 1999.

    Article  Google Scholar 

  • Torcq, F., J. Besse, D. Vaslet, J. Marcoux, L. Ricou, M. Halawani, and M. Basahel, Paleomagnetic results from Saudi Arabia and the Permo-Triassic Pangea configuration, Earth. Planet. Sci. Lett., 148, 553–567, 1997.

    Article  Google Scholar 

  • Valencio, D. A., J. F. Vilas, and J. E. Mendia, Paleomagnetism of a sequence of red beds of the middle and the upper sections of Paganzo Group (Argentina) and the correlation of upper Palaeozoic—lower Mesozoic rocks, Geophys. J. R. astr. Soc., 51, 59–74, 1977.

    Article  Google Scholar 

  • Van der Voo, R., The reliability of paleomagnetic data, Tectonophysics, 184, 1–9, 1990.

    Article  Google Scholar 

  • Van der Voo, R. Paleomagnetism of the Atlantic, Tethys and Iapetus Oceans, Cambridge University Press, 411 pp., 1993.

    Book  Google Scholar 

  • Van der Voo, R. and T. Torsvik, Evidence for late Paleozoic and Mesozoic non-dipole fields provides an explanation for the Pangea reconstruction problems, Earth. Planet. Sci. Lett., 187, 71–81, 2001.

    Article  Google Scholar 

  • Vilas, J. F., Paleomagnetism of South American rocks and the dynamic processes related with the fragmentation of Western Gondwana, in Paleoreconstruction of the Continents, edited by M. W. McElhinny and D. A. Valencio, Am. Geophys. Union, Geol. Soc. Am., Geodynamics Series, 2, 106–114, 1981.

    Article  Google Scholar 

  • Vizán, H., R. Ixer, P. Turner, J. M. Cortés, and G. Cladera, Paleomagnetism of Upper Triassic rocks in the Los Colorados Hill section, Mendoza province, Argentina, Journal of South American Earth Sciences, 18, 41–59, 2004.

    Article  Google Scholar 

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Rapalini, A.E., Fazzito, S. & Orué, D. A new Late Permian paleomagnetic pole for stable South America: The Independencia group, eastern Paraguay. Earth Planet Sp 58, 1247–1253 (2006). https://doi.org/10.1186/BF03352620

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