Phase relations in the Cabeza de Araya cordierite monzogranite, Iberian Massif: Implications for the formation of cordierite in a crystal mush

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dc.identifier.uri http://dx.doi.org/10.15488/3374
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/3404
dc.contributor.author García-Moreno, O.
dc.contributor.author Corretgé, L.G.
dc.contributor.author Holtz, F.
dc.contributor.author García-Arias, M.
dc.contributor.author Rodríguez, C.
dc.date.accessioned 2018-05-23T08:43:21Z
dc.date.available 2018-05-23T08:43:21Z
dc.date.issued 2017
dc.identifier.citation García-Moreno, O.; Corretgé, L.G.; Holtz, F.; García-Arias, M.; Rodríguez, C.: Phase relations in the Cabeza de Araya cordierite monzogranite, Iberian Massif: Implications for the formation of cordierite in a crystal mush. In: Geologica Acta 15 (2017), Nr. 4, S. 337-359. DOI: https://doi.org/10.1344/GeologicaActa2017.15.4.6
dc.description.abstract Experimental investigations and thermodynamic calculations of the phase relations of a cordierite-rich monzogranite from the Cabeza de Araya batholith (Cáceres, Spain) have been performed to understand the formation of cordierite. The experiments failed to crystallize cordierite in the pressure range 200-600MPa, in the temperature range 700-975ºC and for different water activities (melt water contents between 2 and 6 wt.%). In contrast, clinopyroxene and orthopyroxene (absent in the natural mineral rock assemblage), together with biotite, were observed as ferromagnesian assemblage in a wide range of experimental conditions. Thermodynamic calculations, using the software PERPLE_X, describe the formation of cordierite only at 200 and 400MPa and very low water contents, and the amount of cordierite formed in the models is always below 3.5 vol.%. The results indicate that cordierite is not in equilibrium with the bulk rock compositions. The most probable explanation was that cordierite nucleated and crystallized from a melt that is not in equilibrium with part of the mineral assemblage present in the magma. This “non-reactive” mineral assemblage was mainly composed of plagioclase. The silicate melts from which cordierite crystallized was more Al-rich and K-rich than the silicate melt composition in equilibrium with the bulk composition. One possible process for the high Al content of the silicate melt is related to assimilation and partial melting of Al-rich metasediments. An exo-perictetic reaction is assumed to account for both textural and geochemical observations. On the other hand, hybridization processes typical for calc-alkaline series can also explain the high proportions of “non-reactive” minerals observed in relatively high temperature magmas. This study clearly demonstrates that silicate melts in a crystal mush can depart significantly from the composition of melt that should be in equilibrium with the bulk solid assemblage. © O. García-Moreno, L.G. Corretgé, F. Holtz, M. García-Arias, C. Rodríguez, 2017 CC BY-SA. eng
dc.language.iso eng
dc.publisher Barcelona : Universitat de Barcelona
dc.relation.ispartofseries Geologica Acta 15 (2017), Nr. 4
dc.rights CC BY-SA 4.0
dc.rights.uri https://creativecommons.org/licenses/by-sa/4.0/
dc.subject Cordierite eng
dc.subject Monzogranites experimental petrology eng
dc.subject Peritectic eng
dc.subject Pseudosections eng
dc.subject Ceres eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Phase relations in the Cabeza de Araya cordierite monzogranite, Iberian Massif: Implications for the formation of cordierite in a crystal mush
dc.type article
dc.type Text
dc.relation.issn 1695-6133
dc.relation.doi https://doi.org/10.1344/GeologicaActa2017.15.4.6
dc.bibliographicCitation.issue 4
dc.bibliographicCitation.volume 15
dc.bibliographicCitation.firstPage 337
dc.bibliographicCitation.lastPage 359
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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