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Book Chapter

Black-crust growth and interaction with underlying limestone microfacies

By
Gilles Fronteau
Gilles Fronteau
1
Groupe d'Etude des Géomatériaux et des Environnements Naturels et Anthropiques (GEGENA)
,
EA 3975, University of Reims Champagne-Ardenne, CREA, 2 esplanade Roland Garros, 51100 Reims
,
France
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Céline Schneider-Thomachot
Céline Schneider-Thomachot
1
Groupe d'Etude des Géomatériaux et des Environnements Naturels et Anthropiques (GEGENA)
,
EA 3975, University of Reims Champagne-Ardenne, CREA, 2 esplanade Roland Garros, 51100 Reims
,
France
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Edith Chopin
Edith Chopin
1
Groupe d'Etude des Géomatériaux et des Environnements Naturels et Anthropiques (GEGENA)
,
EA 3975, University of Reims Champagne-Ardenne, CREA, 2 esplanade Roland Garros, 51100 Reims
,
France
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Vincent Barbin
Vincent Barbin
1
Groupe d'Etude des Géomatériaux et des Environnements Naturels et Anthropiques (GEGENA)
,
EA 3975, University of Reims Champagne-Ardenne, CREA, 2 esplanade Roland Garros, 51100 Reims
,
France
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Dominique Mouze
Dominique Mouze
2
Dynamique des Transferts aux Interfaces
,
EA 3803, Université de Reims Champagne-Ardenne, UFR Sciences Exactes et Naturelles, BP 1039, 51 687 REIMS Cedex 2
,
France
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André Pascal
André Pascal
1
Groupe d'Etude des Géomatériaux et des Environnements Naturels et Anthropiques (GEGENA)
,
EA 3975, University of Reims Champagne-Ardenne, CREA, 2 esplanade Roland Garros, 51100 Reims
,
France
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Published:
January 01, 2010

Abstract

Black crust growth mechanisms on three French building stones are described using diagenetic models that reveal the close links between the crust–stone interfaces and the microfacies of the host limestone. Each limestone is representative of a specific sedimentary facies and displays mixed pore structure: crinoidal limestone (Euville limestone), oolitic limestone (Savonnières limestone) and bioclastic matrix-supported limestone (Courville limestone). The crinoidal limestone is mainly made of well-developed calcitic cement (spar syntaxial calcite) with low macrocroporosity (15–20 vol. %). The oolitic limestone is macroporous (30–40 vol. %), oolite nucleus being partially or completely dissolved. The third building stone studied is less porous (14 vol. %) but presents a significant microporosity.

Weathering of the Euville limestone proceeds primarily through preferential exploitation of cleavages and microcracks and secondly by progressive recrystallization in the areas separated by previous gypsum fill-in (micro-box work). In the Savonnières limestone (oolitic limestone), gypsum recrystallization could occur without microcracks: elements are sometimes nearly totally weathered, while the palisadic calcitic cement surrounding the oolites was still preserved. In the matrix-supported limestone (Courville limestone), weathering could deeply affect the matrix while elements are not weathered. When a layer of microcrystalline calcite is observed on the surface of the limestone, however, the black crust growth seems to be limited to the external part of the stone.

Porous characteristics of limestones directly depend on sedimentary and diagenetic phases developed. The pore network controls moisture movement and also determines the reactivity of the stone to gypsum recrystallization.

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Contents

Geological Society, London, Special Publications

Natural Stone Resources for Historical Monuments

R Přikryl
R Přikryl
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Á Török
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Geological Society of London
Volume
333
ISBN electronic:
9781862395817
Publication date:
January 01, 2010

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