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Clay Minerals Formed During Propylitic Alteration of a Granite and Their Influence on Primary Porosity: A Multi-Scale Approach

Published online by Cambridge University Press:  01 January 2024

M. Cassiaux ,
D. Proust ,
M. Siitari-Kauppi ,
P. Sardini  and
Y. Leutsch
M. Cassiaux
Affiliation:
UMR 6532 CNRS, HydrASA, Faculté des Sciences, 40 Avenue du recteur Pineau, 86022 Poitiers cedex, France
D. Proust*
Affiliation:
UMR 6532 CNRS, HydrASA, Faculté des Sciences, 40 Avenue du recteur Pineau, 86022 Poitiers cedex, France
M. Siitari-Kauppi
Affiliation:
Laboratory of Radiochemistry, Department of Chemistry, PO Box 55, FIN-00014, University of Helsinki, Finland
P. Sardini
Affiliation:
UMR 6532 CNRS, HydrASA, Faculté des Sciences, 40 Avenue du recteur Pineau, 86022 Poitiers cedex, France
Y. Leutsch
Affiliation:
ANDRA, Parc de la Croix Blanche, 1/7 rue Jean Monnet, 92290 Chatenay-Malabry, France
*
*E-mail address of corresponding author: dominique.proust@hydrasa.univ-poitiers.fr
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Abstract

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The porosity of a propylitized granite from Charroux (France), with no fractures or sealed fractures, increases by more than four times from the unaltered (0.3%) to the altered rock (1.4%). This evolution results from several local porosity modifications which occur at different scales in the rock: (1) at the core scale, from 10−1 to 10−5 m, where rock porosity changes as a function of rock-forming mineralogical composition; (2) at the mineral scale, from 10−3 to 10−7 m, where porosity depends both on the nature of the rock-forming mineral and its clay mineral alteration. Mineralogical and porosity data collected from the granite using a mineralogical map (after chemical staining and scanning electron microscopy images combined with autoradiographs) indicate that (1) the ferromagnesian rock-forming minerals — biotite and magnesiohornblende — act as the main porosity source in the unaltered granite, and (2) the nature of the clay minerals replacing rock-forming minerals in the altered granite appears to control the porosity value through two major alteration processes: chloritization and phengitization which affect the ferromagnesian minerals and produce non-porous chloritic and porous phengitic areas, respectively, at the studied scales. The observation that incipient porosity formation in granites is strongly linked to the pathway of ferromagnesian silicate alteration and subsequent clay mineral formation underlines the need to study parent-rock texture and mineralogy and their effects on subsequent near-surface weathering of granites.

Keywords

AutoradiographConnected PorosityGraniteMicroprobe AnalysisPropylitic AlterationSEMXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 54 , Issue 5 , October 2006 , pp. 541 - 554
Copyright
Copyright © 2006, The Clay Minerals Society

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