Jump to ContentJump to Main Navigation
Show Summary Details
More options …

Open Geosciences

formerly Central European Journal of Geosciences

Editor-in-Chief: Jankowski, Piotr

IMPACT FACTOR 2017: 0.696
5-year IMPACT FACTOR: 0.736

CiteScore 2017: 0.89

SCImago Journal Rank (SJR) 2017: 0.323
Source Normalized Impact per Paper (SNIP) 2017: 0.674

Open Access
See all formats and pricing
More options …

The Early Triassic magmatism of the Alto Paraguay Province, Central South America: Paleomagnetic and ASM data

Marcia Ernesto
  • Department of Geophysics, University of São Paulo, Rua do Matão 1226, 05508-090 São Paulo, SP, Brazil
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Piero Comin-Chiaramonti
  • Department of Mathematics and Geosciences, University of Trieste, Via Weiss 2, 34127 Trieste, Italy
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Celso de Barros Gomes
  • Institute of Geosciences, University of São Paulo, Rua do Lago, 05508-080 São Paulo, SP, Brazil
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2015-10-08 | DOI: https://doi.org/10.1515/geo-2015-0022


A paleomagnetic studystudywork was carried out on the Alto Paraguay Province (APP), a belt of alkaline complexes that parallel the Paraguay river for more than 40 km at the border of Brazil and Paraguay. The province is well dated by 40Ar/39Ar method giving ages in the range 240–250 Ma with a preferred age of 241 Ma. Intrusive rocks are predominant but the stocks may be topped by lava flows and ignimbrites. Paleomagnetic work on stocks, dikes and flows of the APP identified normal and reversed magnetic components which are carried mainly by titanomagnetites. The calculated paleomagnetic pole located at 319ºE 78ºS (α95 = 6º; k = 23) is in agreement with other South American poles of Permo-Triassic age. Most of the sampling sites showed large variations in rock magnetization, but similar patterns in the variation of the within-site magnetizations, mainly in dikes, suggest geomagnetic polarity transition records. The magnetization data along with the anisotropy of magnetic susceptibility determinations suggested that the South and North areas of the province have different evolution characteristics.

Keywords: alkaline magmatism; paleomagnetism; magnetic anisotropy; Alto Paraguay Province


  • [1] Fúlfaro V.J., Geology of Eastern Paraguay. In: Comin- Chiaramonti, P., Gomes, C.B. (Eds.), Alkaline magmatism in central-eastern Paraguay. Relationships with coeval magmatism in Brazil, Edusp/Fapesp, São Paulo, 1996, pp. 17-30. Google Scholar

  • [2] Zalán P.V.,Wolff S., Astolfi M.A., Santos V.I., Conceição J.C., Appi V., Neto E.V.S., Cerqueira J.R., Marques A., The Paraná basin, Brazil. In: Leighton, M.W., Kolata, D.R., Olttz, D.F., Eidel, J.J. (Eds.), Am. Assoc. Petroleum Geol., Memoir, 51:681–703, 1990. Google Scholar

  • [3] Piccirillo E.M., Melfi A.J. (Eds.), The Mesozoic flood volcanism from the Paraná basin (Brazil), Petrogenetic and geophysical aspects, IAG-USP, 1988, 600p. Google Scholar

  • [4] Comin-Chiaramonti P., Gomes C.B. (Eds.), Mesozoic to Cenozoic alkaline magmatism in the Brazilian Platform, Edusp/Fapesp, São Paulo, 2005, 752p. Google Scholar

  • [5] Velázquez V.F., Gomes C.B., Orué D., Comin-Chiaramonti P., Magamatismo alcalino do Paraguai: uma revisão e atualização das províncias, Bol. IG-USP, Sér. Cient., 26:61–79, 1996. Google Scholar

  • [6] Livieres R.A., Quade H., Distribución regional y asentamiento tectónico de los complejos alcalinos del Paraguay, Zentr. Geol. Paläontol., 7/8:791–805, 1987. Google Scholar

  • [7] Comin-Chiaramonti P., Gomes C.B., Censi P., Gasparon M., Velázquez V.F., Alkaline complexes from the Alto Paraguay Province at the border of Brazil, Mato Grosso do Sul State) and Paraguay. In: Comin-Chiaramonti P., Gomes, C.B. (Eds.), Mesozoic to Cenozoic alkaline magmatism in the Brazilian Platform., Edusp/Fapesp, São Paulo, 2005, pp. 71–148. Google Scholar

  • [8] Tankard A.J., Uliana M.A., Welsink H.J., Ramos V.A., Turic M., França A.B., Milani E.J., Brito Neves B.B., Eyles N., Skarmeta J., Santa Ana H., Wiens F., Cirbián M., Paulsen O.L., Germs G.J.B., De Wit M.J., Machacha T., Miller R., Structural and tectonic controls of basin evolution in Southwestern Gondwana during the Phanerozoic. In: Tankard A.J. et al. (Eds.), Petroleum Basins of South America, Am. Assoc. Petroleum Geol., Memoir, 62:5–52, 1996. Google Scholar

  • [9] Milani E.J., Evolução tectono-estratigráfica da Bacia do Paraná e seu relacionamento com a geodinâmica fanerozóica do Gondwana Sul-Ocidental, Ph.D. Thesis, Federal University of Rio Grande do Sul, 1997, 255p. Google Scholar

  • [10] Johnston S.T., The Cape Fold Belt and Syntaxis, and the rotated Falkland Islands: dextral transpressional tectonics along the southwest margin of Gondwana, J. African Earth Sc., 31:51–63, 2000. Google Scholar

  • [11] Riccomini C., Velázquez V.F., Gomes C.B., Tectonic controls of the Mesozoic and Cenozoic alkaline magmatism in centralsoutheastern Brazilian platform. In: Comin-Chiaramonti P., Gomes C.B. (Eds.), Mesozoic to Cenozoic alkaline magmatism in the Brazilian Platform, Edusp/Fapesp, São Paulo, 2005, pp. 31–56. Google Scholar

  • [12] Fisseha S., Ussami N., Padilha A.L., Vitorello I., Crustal structures of Cenozoic Pantanal wetland (SW Brazil) from MT and gravity studies: geophysical evidence of a buried Neoproterozoic-Cambrian suture zone, Am. Geophys. Union, Fall Meeting, Abstract, GP11A-0254F. Google Scholar

  • [13] Kröner A., Cordani U.G., African, southern Indian and South AmericanCratons were not part of the Rodinia supercontinent: evidence from field relationships and geochronology, Tectonophysics, 375:325–352, 2003. Google Scholar

  • [14] Cordani U.G., TeixeiraW., D’Agrella Filho M.S., Trindade R.I., The position of the Amazonian Craton in supercontinents, Gondwana Res., 15:396–407, 2009. Web of ScienceCrossrefGoogle Scholar

  • [15] Comin-Chiaramonti P., Marzoli, A., Gomes C.B., Milan A., Riccomini C., Velázquez V.F., Mantovani M.M.S., Renne P., Tassinari C.C.G., Vasconcelos P.M., The origin of post-Paleozoic magmatism in eastern Paraguay, Geol. Soc. Am., Sp. Paper, 430:603– 633, 2007. Google Scholar

  • [16] Almeida F.F.M., Geologia do Sudoeste Matogrossense, Div. Geol. Min., DNPM, Bol. 116, 118 p., 1945. Google Scholar

  • [17] Ussami N., Shiraiwa S., Dominguez J.M.L., Basement reactivation in a sub-Andean foreland flexural bulge: the Pantanal wetland, SW Brazil. Tectonics, 18:25–39, 1999. CrossrefGoogle Scholar

  • [18] Paranhos Filho A.C., Nummer A.R., Albrez E.A., Ribeiro A.A., Machado R., 1013, A study of structural lineaments in Pantanal (Brazil) using remote sensing data, An. Acad. Brasil. Cienc. 85: 913–922. Google Scholar

  • [19] Gomes C.B., Laurenzi M.A., Censi P., De Min A., Velázquez V.F., Comin-Chiaramonti P., Alkaline magmatism from northern Paraguay (Alto Paraguay): a Permo-Triassic province. In: Comin-Chiaramonti P., Gomes C.B. (Eds.), Alkaline magmatism in central-eastern Paraguay. Relationships with coeval magmatism in Brazil, Edusp/Fapesp, São Paulo, 1996, pp. 208–222. Google Scholar

  • [20] Comte D., Hasui Y., Geochronology of Eastern Paraguay by the potassium-argon method, Rev. Bras. Geoc., 1:33–43, 1971. Google Scholar

  • [21] Sonoki I.K., Garda G.M., Idades K/Ar de rochas alcalinas do Brasil Meridional e Paraguai Oriental: compilação e adaptação às novas constantes de decaimento, Bol. IG-USP, Sér. Cient., 19:63–87, 1988. Google Scholar

  • [22] Velázquez V.F., Gomes C.B., Teixeira W., Comin-Chiaramonti P., Contribution to the geochronology of the Permo-Triassic alkaline magmatism from the Alto Paraguay Province, Rev. Bras. Geoc., 26:103–108, 1996. Google Scholar

  • [23] Kirschvink J.L., The least-squares line and plane and the analysis of paleomagnetic data, Geophys. J. R. Astron. Soc., 62:699– 718, 1980. Google Scholar

  • [24] Fisher R.A., Dispersion on a sphere, Proceendings of Royal Society of London, Ser. A 217, 295–305, 1953. Google Scholar

  • [25] Domeier D., Van der Voo R., Tohver E., Tomezzoli R.N., Vizan H., Torsvik T.H., New Late Permian paleomagnetic data from Argentina: refinement of the apparent polar wander path of Gondwana, G3 12, Q07002, 2011, doi:10.1029/2011GC003616. Web of ScienceCrossrefGoogle Scholar

  • [26] Yokoyama E., Brandt D., Tohver E., Trindade R., The Pangea conundrum: implications of a new paleomagnetic pole from the Permo-Triassic Araguainha impact structure (Central Brazil), Latinmag Lett., 3:PB16, 1–6, Proceedings, Montevideo, 2013, Uruguay. Google Scholar

  • [27] Cañon-Tapia E., Pinkerton H., The anisotropy of magnetic susceptibility of lava flows: an experimental approach, J. Volc. Geotherm. Res., 98:219–233, 2000. Google Scholar

  • [28] Bascou J., Camps P., Dautria J.M., Magnetic versus crystallographic fabrics in a basaltic lava flow, J. Volc. Geotherm. Res., 145:119–135, 2005. Google Scholar

  • [29] Tamrat E., Ernesto M., Paleomagnetic constraints on the age of the Botucatu Formation in Rio Grande do Sul, Southern Brazil, An. Acad. Bras. Ciênc., 78:1–15, 2006. Google Scholar

  • [30] Kent V.D., Olsen P., Astronomically tuned geomagnetic time scale for the Late Triassic, J. Geophys. Res., 104:12831–12841, 1999. CrossrefGoogle Scholar

  • [31] Gomes C.B., Comin-Chiaramonti P., Velázquez V.F., A synthesis on the alkaline magmatism of Eastern Paraguay, Brazilian J. Geol., 43:745–761, 2013. Google Scholar

  • [32] Brandt D., Ernesto M., Rocha-Campos A.C., Santos P.R., Paleomagnetism of the Santa Fé Group, central Brazil: implications for the late Paleozoic apparent polar wander path for South America, J. Geophys. Res., 114, p. B02101, 2009. Web of ScienceGoogle Scholar

  • [33] Domeier M., Van der Voo R., Torsvik T.H., Paleomagnetism and Pangea: the road to reconciliation, Tectonophysics, 514-517:14– 43, 2012. Web of ScienceGoogle Scholar

About the article

Received: 2014-03-24

Accepted: 2014-02-23

Published Online: 2015-10-08

Citation Information: Open Geosciences, Volume 7, Issue 1, ISSN (Online) 2391-5447, DOI: https://doi.org/10.1515/geo-2015-0022.

Export Citation

©2015 M. Ernesto et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

Citing Articles

Here you can find all Crossref-listed publications in which this article is cited. If you would like to receive automatic email messages as soon as this article is cited in other publications, simply activate the “Citation Alert” on the top of this page.

L. C. Gallo, R. N. Tomezzoli, and E. O. Cristallini
Geochemistry, Geophysics, Geosystems, 2017, Volume 18, Number 4, Page 1499

Comments (0)

Please log in or register to comment.
Log in