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Clay minerals related to the late magmatic activity of the Piton des Neiges (Réunion Island): consequence for the primitive crusts

Published online by Cambridge University Press:  23 January 2019

Gilles Berger ,
Daniel Beaufort  and
Raphaël Antoine
Gilles Berger
Affiliation:
IRAP, CNRS, UPS, Observatoire Midi-Pyrénées, 14 Av. E. Belin, 31400 Toulouse, France
Daniel Beaufort
Affiliation:
IC2MP, Université Poitiers, 40 Av. Recteur Pineau, 86022 Poitiers Cedex, France
Raphaël Antoine*
Affiliation:
IRAP, CNRS, UPS, Observatoire Midi-Pyrénées, 14 Av. E. Belin, 31400 Toulouse, France CEREMA Normandie-Centre, 76121 Le Grand Quevilly, France
*
*E-mail: [email protected]
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Abstract

This paper describes a detailed petrographic and isotopic study of hypabyssal sheets of quartz-syenite that represent the ultimate differentiation product of the oceanite alkaline magmatic reservoir of the Piton des Neiges stratovolcano (Réunion Island). Clay minerals of the corrensite to chlorite series crystallized during the late-magmatic activity, with quartz, carbonates and accessory minerals from juvenile fluids filling the primary porosity of the quartz-syenite. It is proposed that a double chemical transfer occurred at the end of the crystallization process: degassing of the exsolved CO2-rich and SiO2-rich fluid from the magmatic chamber through the porous quartz-syenite and diffusion of Al, Fe and Mg from the intruded basalts affected by the juvenile fluids towards the primary porosity of the quartz-syenite, feeding the crystallization of late-magmatic clays in the residual primary pores after quartz and carbonate deposition. This process may be generalized to alkaline plutonism, as well as to the primitive crusts of terrestrial planets, and may be the first source of clays in early planets.

Keywords

clay mineralsalkali magmatismquartz-syeniteoceaniteMars
Type
Article
Information
Clay Minerals , Volume 53 , Issue 4 , December 2018 , pp. 675 - 690
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: M. Buatier

References

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