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Fingerprinting the provenance of building stones: a case study on the Louvigné and Lanhélin granitic rocks (Armorican massif, France)

Claudine Malfilatre 1 Erwan Hallot 2, * Philippe Boulvais 2 Marc Poujol 2 Annick Chauvin 3 Denis Gapais 4 Marie-Pierre Dabard 3 Sylvie Bourquin 3 Didier Pallix 5
* Corresponding author
1 Systèmes Tectoniques
GR - Géosciences Rennes
2 Terre, Temps, Traçage
GR - Géosciences Rennes
3 GR - Géosciences Rennes
4 Sytèmes Tectoniques
GR - Géosciences Rennes
5 Centre Technique de Matériaux Naturels de Construction
Abstract : Two examples of granitic stones from Brittany (western France) commercialized under the names of "gris-bleu de Louvigné" and "bleu de Lanhélin" were characterized in order to explore how the provenance of a building stone can be traced back with a maximum of confidence. For this purpose, petrographical, geochemical and magnetic characteristics, representing more than 70 quantitative and qualitative variables, were compiled for a total of 32 samples. We have defined two reference populations for these building stones and have extracted their discriminative characteristics. We have then compared four randomly selected samples and two foreign commercial counterparts of these stones to the reference populations. Discriminative variables differ from one case of comparison to the other, which indicates that a combination of various tools and variables will be generally required to unequivocally fingerprint the origin of a given granitic stone. Where several quarries are mining a single geological unit within a composite intrusion, the provenance of a granitic rock can be defined at the scale of the intrusion. In addition, stones coming from two different intrusions from the same batholith can be distinguished. We conclude that the provenance of any granitic building stone is identifiable, especially if the intrinsic variability of a population of samples representative of that stone has been previously circumscribed. This study underlines that the compilation of databases for building stone identity cards is an essential first step toward the creation of official labels guaranteeing stone provenances.
Keywords : Granitoids Building stones Provenance Petro-geochemistry Magnetic properties Armorican massif
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https://hal-insu.archives-ouvertes.fr/insu-00937298
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Submitted on : Tuesday, January 28, 2014 - 10:54:08 AM
Last modification on : Tuesday, October 19, 2021 - 10:53:12 PM

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  • HAL Id : insu-00937298, version 1

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Claudine Malfilatre, Erwan Hallot, Philippe Boulvais, Marc Poujol, Annick Chauvin, et al.. Fingerprinting the provenance of building stones: a case study on the Louvigné and Lanhélin granitic rocks (Armorican massif, France). Bulletin de la Société Géologique de France, Société géologique de France, 2014, 185 (1), pp.13-31. ⟨insu-00937298⟩

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