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Palaeomagnetism and 40Ar/39Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana

Claudia Beatriz Zaffarana and Rubén Somoza
Journal of the Geological Society, 169, 371-379, 11 July 2012, https://doi.org/10.1144/0016-76492011-089
Claudia Beatriz Zaffarana
Departamento de Ciencias Geológicas, FCEyN, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, C1428EHA, Buenos Aires, ArgentinaIGEBA-CONICET, Argentina
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Rubén Somoza
Departamento de Ciencias Geológicas, FCEyN, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, C1428EHA, Buenos Aires, ArgentinaIGEBA-CONICET, Argentina
  • Find this author on Google Scholar
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  • For correspondence: somoza@gl.fcen.uba.ar
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Abstract

New 40Ar/39Ar data indicate ages of c. 185 Ma for the Lonco Trapial volcanic field in Gastre, north–central Patagonia, implying that this andesitic unit is roughly coeval with the Marifil silicic province that crops out in the eastern part of northern Patagonia. These volcanic fields are therefore roughly coeval with the Karoo–Ferrar large igneous province, further contributing to the huge, 185–180 Ma magmatic outpouring in southern Gondwana. The comparison of palaeomagnetic results from the unit with Early Jurassic reference palaeopoles suggests that Gastre records a small, anticlockwise finite rotation with respect to stable South America. This contrasts sharply with the large clockwise rotation recorded by roughly coeval dolerites from the Falkland/Malvinas Islands, and argues against a direct relationship between the rotation of the islands and the tectonic activity in Gastre. The results support previous suggestions that the Gastre Fault System is not the locus of major strike-slip displacement activity in the Jurassic as some workers have suggested. Taken as a whole, palaeomagnetic data from Patagonia suggest a more complex than previously thought pattern of distributed and variable deformation during the early stages of Gondwana breakup. The crustal block boundaries in the region remain cryptic.

Supplementary material: 40Ar/39Ar analytical procedures and expanded data are available at http://www.geolsoc.org.uk/SUP18522.

  • © The Geological Society of London

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Journal of the Geological Society: 169 (4)
Journal of the Geological Society
Volume 169, Issue 4
July 2012
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Palaeomagnetism and 40Ar/39Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana

Claudia Beatriz Zaffarana and Rubén Somoza
Journal of the Geological Society, 169, 371-379, 11 July 2012, https://doi.org/10.1144/0016-76492011-089
Claudia Beatriz Zaffarana
Departamento de Ciencias Geológicas, FCEyN, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, C1428EHA, Buenos Aires, ArgentinaIGEBA-CONICET, Argentina
  • Find this author on Google Scholar
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Rubén Somoza
Departamento de Ciencias Geológicas, FCEyN, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, C1428EHA, Buenos Aires, ArgentinaIGEBA-CONICET, Argentina
  • Find this author on Google Scholar
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  • For correspondence: somoza@gl.fcen.uba.ar

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Palaeomagnetism and 40Ar/39Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana

Claudia Beatriz Zaffarana and Rubén Somoza
Journal of the Geological Society, 169, 371-379, 11 July 2012, https://doi.org/10.1144/0016-76492011-089
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  • Article
    • Abstract
    • The Lonco Trapial Formation at Gastre
    • Geochronology
    • Palaeomagnetism
    • Early Jurassic tectonomagmatic overview of the North Patagonian Massif
    • Analysing the Pliensbachian–Toarcian palaeomagnetic record in northern Patagonia
    • Conclusions
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