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Mineral chemistry of megacrysts and associated clinopyroxenite enclaves in the Calatrava volcanic field: crystallization processes in mantle magma chambers

  • C. VillasecaEmail author
  • O. Dorado
  • D. Orejana
Research Paper
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Abstract

Clinopyroxene, amphibole and phlogopite megacrysts appear in the crystal- and xenolith-rich pyroclastic deposits of the Cerro Pelado and the El Aprisco volcanoes (Calatrava volcanic field). These megacrysts display a similar composition to crystals forming clinopyroxenite and rare phlogopite-rich (glimmerite) enclaves. The host magmas are highly porphyritic, showing a complex population of mafic macrocrysts and phenocryst cores. Most of these crystals are chemically similar, suggesting that they constitute a cogenetic suite of phenocrystic origin. Geobarometric estimations indicate that megacrysts and enclaves represent high-P cumulates, mostly formed at about 12–16 kbar within the upper lithospheric mantle (35 to 55 km). The compositional variability of the analyzed minerals indicates a differentiation process controlled by fractionation of olivine, clinopyroxene, amphibole and phlogopite. The crystallization of hydrous mafic minerals at mantle depths facilitated CO2 exsolution and subsequent boiling of the host magma, thus triggering the fragmentation of the semi-crystallized margin of the magma chamber and the excavation of mantle wall-rocks. This deep fragmentation could also explain the complex variety of crystals, enclaves and xenoliths dragged by the volcanic magmas. Two clinopyroxene types (green and colourless) have been found, both as antecrysts (macrocryst/phenocryst cores) and within enclaves. The coexistence of these clinopyroxenes within zoned crystals in clinopyroxenites suggests that they might be cognate, representing primitive and evolved products of a single fractionating magma. This study provides a model for the ascent of crystal- and xenolith-rich magmas that could be regarded in other alkaline volcanics carrying complex crystal cargos from the Cenozoic circum-Mediterranean area.

Keywords

Mafic megacrysts Clinopyroxenite Glimmerite Melilitite melt Calatrava volcanic field Alkaline circum-Mediterranean province 

Resumen

Megacristales de clinopiroxeno, anfíbol y flogopita aparecen en los depósitos piroclásticos ricos en cristales, enclaves y xenolitos, de los volcanes de El Aprisco y Cerro Pelado (campo volcánico de Calatrava). Estos megacristales muestran una composición química similar a los cristales que forman los enclaves clinopiroxeníticos asociados, incluyendo los poco comunes enclaves ricos en flogopita (glimmeritas). El magma volcánico es de textura porfídica, mostrando una compleja población de fenocristales y macrocristales máficos, con núcleos residuales, que sugieren formen una suite cogenética con aquellos. Las estimaciones geobarométricas indican que los megacristales, así como los núcleos de fenocristales y los enclaves clinopiroxeníticos representan acumulados de alta presión, formados entre 12–16 kbar, en el manto litosférico superior (de 35 a 55 km). La variabilidad composicional de estos minerales máficos apunta a un proceso de diferenciación controlado por la cristalización de olivino, clinopiroxeno, anfíbol y flogopita. La cristalización de minerales máficos hidratados en el manto facilitaría la exsolución de CO2 y la subsecuente ebullición del fundido, posibilitando la fragmentación de los márgenes semicristalinos de la cámara magmática y la excavación de la roca mantélica encajante. Esta fragmentación profunda explicaría también la compleja variedad de cristales, enclaves y xenolitos atrapados por los magmas volcánicos. Se han encontrado dos tipos de clinopiroxenos (verde e incoloro) que aparecen como antecristales (núcleos de macrocristales/fenocristales) y también en los enclaves piroxeníticos. La coexistencia de ambos tipos de clinopiroxeno en los zonados cristalinos de las clinopyroxenitas sugiere que deben ser cogenéticos, representando precipitados de fundidos de distinto grado evolutivo, pero posiblemente de un mismo magma fraccionante. Este estudio propone un modelo de ascenso y origen de magmas ricos en cristales y xenolitos que puede ser útil para explicar otros tipos volcánicos que transportan complejos cargamentos de cristales profundos, como ocurre frecuentemente en la provincia volcánica circum-Mediterránea.

Palabras clave

megacristales máficos clinopyroxenita glimmerita fundidos melilitíticos campo volcánico de Calatrava provincia alcalina circum-Mediterránea 

Notes

Acknowledgements

We acknowledge Alfredo Fernández Larios for his assistance with the electron microprobe in the Centro Nacional de Microscopía Electrónica Luis Bru (UCM). We thank associate editor Teresa Ubide and the two reviewers Marco Brenna and Mario Gaeta for their helpful comments on an earlier version of this paper. This work is included in the objectives of, and supported by, the CGL2016-78796 project of the Ministerio de Economía y Competitividad de España, and the 910492 UCM project.

Supplementary material

41513_2019_101_MOESM1_ESM.xlsx (55 kb)
Supplementary material 1 (XLSX 55 kb) PT estimates based on clinopyroxene-liquid thermobarometry

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© Universidad Complutense de Madrid 2019

Authors and Affiliations

  1. 1.Dpt. Mineralogía y Petrología, Facultad CC GeológicasUCMMadridSpain
  2. 2.Instituto de Geociencias IGEO (UCM, CSIC)MadridSpain

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