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Microgranular enclaves as evidence of rapid cooling in granitoid rocks: the case of the Los Pedroches granodiorite, Iberian Massif, Spain

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Abstract

Microgranular enclaves from the Los Pedroches granodiorite (LPG) (Los Pedroches Batholith, Iberian Massif, Spain) have Sr-Nd isotopic and mineral chemical compositions close to those of their host. This similarity is not related to restite unmixing, as indicated by the igneous textures of the enclaves. A number of other geological and geochemical lines of evidence, including the high REE and HFSE contents of the microgranular enclaves relative to the host granitoid, strongly suggest that this similarity cannot be explained by magma mixing. Alternatively, a crystallization process by rapid cooling within the host granitoid magma could explain the geochemical and textural characteristics of the microgranular enclaves, including shape, grain size, mineralogy, texture, chemistry and Sr-Nd isotopic composition. Such a crystallization occurred at the walls of the magma conduits through which the granitic magmas were emplaced in the upper crust. This process should be considered as an alternative hypothesis to magma mixing for the generation of some microgranular enclaves, especially where no direct evidence exists for the presence of basic magmas coeval with granitoids, and where there is a lack of isotopic contrast between hosts and enclaves. As the process is favoured by feeder-dyke related emplacement, we suggest that abundance of microgranular enclaves can be related to the mechanism of emplacement of granitoid bodies.

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Notes

  1. Total iron as ferrous oxide.

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Acknowledgements

We thank Professor Robert D. Hatcher Jr. for language reviews and helpful comments. This work was supported by the research project entitled: “Análisis petrogenético y mineralogenético del batolito de Los Pedroches” (Consejería de Fomento de la Junta de Andalucía). Constructive criticisms by Dr. J. D. Clemens and Dr. R. A. Wiebe are acknowledged with thanks.

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  1. Departamento de Geologìa, Facultad de Ciencias Experimentales, Universidad de Huelva, campus de El Carmen, 21071, Huelva, Spain

    Teodosio Donaire & Emilio Pascual

  2. Département de Géologie, O.P.G.C., CNRS et Université Blaise Pascal, 5 rue Kessler, 63038, Clermont-Ferrand Cedex, France

    Christian Pin & Jean-Louis Duthou

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  1. Teodosio Donaire
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  2. Emilio Pascual
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Correspondence to Teodosio Donaire.

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Donaire, T., Pascual, E., Pin, C. et al. Microgranular enclaves as evidence of rapid cooling in granitoid rocks: the case of the Los Pedroches granodiorite, Iberian Massif, Spain. Contrib Mineral Petrol 149, 247–265 (2005). https://doi.org/10.1007/s00410-005-0652-0

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