Cordierite in the Cabeza de Araya granitean exo-peritectic phase from wall-rock local assimilation?

  1. Carmen Rodríguez 1
  2. A. Castro 1
  3. Olga García Moreno 2
  1. 1 Universidad de Huelva
    info

    Universidad de Huelva

    Huelva, España

    ROR https://ror.org/03a1kt624

  2. 2 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2016

Issue Title: IX CONGRESO GEOLÓGICO DE ESPAÑA

Issue: 16

Pages: 59-62

Type: Article

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More publications in: Geotemas (Madrid)

Abstract

A prominent feature of the Cabeza de Araya granite, one of the large granite intrusions of the Central Iberian zone (Iberian massif), is the presence of large, several cm length cordierite crystals. These are particularly concentrated in the outer, more mafic facies of the pluton. Although several hypotheses have been proposed to explain the origin of cordierite in these granites, scarce attention has been paid to textures as supporting inferences from experimental studies. We show here new textural relations recently found in the granites of Cabeza de Araya that are relevant in supporting the complex processes involved in the generation of the large cordierite crystals that characterize these granites. We conclude that cordierite is xenogenous but growing in the magma at expenses of peritectic reactions in assimilated xenoliths and in equilibrium with an interstitial melt of the host granite.

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