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

Gilles Berger, Daniel Beaufort and Raphael Antoine
Clay minerals related to the late magmatic activity of the Piton des Neiges (Reunion Island); consequence for the primitive crusts
Clay Minerals (December 2018) 53 (4): 675-690

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 (Reunion 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 CO (sub 2) -rich and SiO (sub 2) -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.


ISSN: 0009-8558
EISSN: 1471-8030
Coden: CLMIAF
Serial Title: Clay Minerals
Serial Volume: 53
Serial Issue: 4
Title: Clay minerals related to the late magmatic activity of the Piton des Neiges (Reunion Island); consequence for the primitive crusts
Affiliation: Institut de Recherche en Astrophysique et Planetologie, Toulouse, France
Pages: 675-690
Published: 201812
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 42
Accession Number: 2019-037957
Categories: Geochemistry of rocks, soils, and sedimentsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch map
S21°06'00" - S21°06'00", E55°28'50" - E55°28'50"
Secondary Affiliation: Universite Poitiers, FRA, France
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2019
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