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Ages and cooling history of the Early Cretaceous Caleu pluton: testimony of a switch from a rifted to a compressional continental margin in central Chile

Miguel A. Parada, Gilbert Féraud, Francisco Fuentes, Luis Aguirre, Diego Morata and Paula Larrondo
Journal of the Geological Society, 162, 273-287, 1 March 2005, https://doi.org/10.1144/0016-764903-173
Miguel A. Parada
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
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Gilbert Féraud
22Géosciences Azur, UMR 6526, CNRS–Université de Nice–Sophie Antipolis, 06108 Nice Cedex 02, France
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Francisco Fuentes
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
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Luis Aguirre
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
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Diego Morata
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
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Paula Larrondo
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
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Abstract

The Caleu pluton, in the Coastal Range of central Chile, represents the last magmatic event related to the Early Cretaceous rifting along the western margin of South America. The pluton was emplaced into a c. 10 km thick pile of mainly basalts and basaltic andesites deposited in an Early Cretaceous subsiding basin, and affected by very low-grade metamorphism. The cooling history of the pluton is documented on the basis of U–Pb, 40Ar/39Ar step-heating and fission-track dating. The U–Pb date suggests an age of emplacement in the interval 94.2–97.3 Ma. Rapid subsolidus cooling between 550–500 °C and 250 °C is documented by 40Ar/39Ar plateau ages on amphibole, biotite and plagioclase between 94.9 ± 1.8 and 93.2 ± 1.1 Ma. Slower subsolidus cooling to c. 100 °C is identified at the 94–90 Ma interval by the fission-track thermal model. The geochronological data show that the emplacement of the pluton is coeval with the very low-grade metamorphism of the host rocks. Therefore, this metamorphism is probably not the result simply of burial, but also of a regional thermal gradient related to the plutonism. Exhumation of the pluton started coevally with its emplacement and continued to about 90 Ma, being associated with the closure of the Early Cretaceous rifting. The Caleu plutonism represents an asthenospheric-derived event during maximum extension, and marks a turning point between extensional- and compressional-related magmatism.

  • Chile
  • Caleu pluton
  • absolute age
  • exhumation
  • extension
  • © 2005 The Geological Society of London
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Journal of the Geological Society: 162 (2)
Journal of the Geological Society
Volume 162, Issue 2
March 2005
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Ages and cooling history of the Early Cretaceous Caleu pluton: testimony of a switch from a rifted to a compressional continental margin in central Chile

Miguel A. Parada, Gilbert Féraud, Francisco Fuentes, Luis Aguirre, Diego Morata and Paula Larrondo
Journal of the Geological Society, 162, 273-287, 1 March 2005, https://doi.org/10.1144/0016-764903-173
Miguel A. Parada
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Gilbert Féraud
22Géosciences Azur, UMR 6526, CNRS–Université de Nice–Sophie Antipolis, 06108 Nice Cedex 02, France
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Francisco Fuentes
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
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  • Search for this author on this site
Luis Aguirre
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
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Diego Morata
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
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Paula Larrondo
11Departamento de Geología, Universidad de Chile, Casilla 13518, Santiago, Chile (e-mail: maparada@cec.uchile.cl)
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Ages and cooling history of the Early Cretaceous Caleu pluton: testimony of a switch from a rifted to a compressional continental margin in central Chile

Miguel A. Parada, Gilbert Féraud, Francisco Fuentes, Luis Aguirre, Diego Morata and Paula Larrondo
Journal of the Geological Society, 162, 273-287, 1 March 2005, https://doi.org/10.1144/0016-764903-173
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  • Article
    • Abstract
    • Geological setting
    • Geology of the Caleu pluton
    • Ocoite Group: lithological and metamorphic features
    • Analytical procedures for 40Ar/39Ar and fission-track dating
    • Geochronological results of the Caleu pluton
    • Interpretation and tectonic significance of the geochronological data
    • Discussion: plutonism during a shift from an extensional to a compressional regime
    • Final considerations
    • Acknowledgements
    • References
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