Cathodoluminescence et origine diagenetique tardive des cargneules du massif des Aiguilles Rouges (Valais, Suisse)

Amieux, P.; Jeanbourquin, P.

doi:10.2113/gssgfbull.v.1.123

Cited by 7 publications

(5 citation statements)

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“…A process of selective dissolution of the dolomite marble clasts explains the origin of the vacuolar texture. This process took place when the calcite-cemented breccias were exposed to weathering at or very close to the topographic surface in a very recent past (possibly the Pleistocene) giving rise to a vacuolar structure comparable to that shown by the so called cargneules well known in the Alpine literature [22]. In some portions of the rock, calcite septa that originally separated the dolomite clasts now surround the voids.…”

Section: Steps 3 Andmentioning

confidence: 95%

“…Moreover, the local occurrence of a white soft powder on the stone suggests sulphation processes due to acid rains. The so called Chianocco marble therefore actually shows a more or less continuous range of fabrics and lithologies from veined marbles to a tectonic carbonate breccia characterized by a high porosity and a vacuolar appearance which is comparable to the cargneules, a historical Alpine term to indicate brecciated carbonate rocks with a vacuolar structure [22].…”

Section: The Palazzo Madama Façadementioning

confidence: 99%

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Minero-Petrographic Characterization of Chianocco Marble Employed for Palazzo Madama Façade in Turin (Northwest Italy)

et al. 2019

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Soprintendenza per i beni e le attività culturali della RegioneAbstract: The study of ancient marble plays an important role in the interpretation of historical and archaeological sites and gives interesting information about building materials used in ancient times and their trade routes. The present work focuses on Chianocco marble that represents one of the most important ancient white marbles for cultural heritage exploited in the Piedmont region (Northwest Italy) and employed for the Palazzo Madama façade. A multi-analytical study based on petrographic (optical and scanning electron microscopy), electron microprobe, cathodoluminescence and stable isotope analyses was carried out on these marbles in order to perform an archaeometric study. Chianocco marble was used in Turin during the baroque era by the Savoy architect Filippo Juvarra (1678-1736) in historical buildings, such as the façade of the Palazzo Madama, the plinth of the façade of the town Cathedral and the columns (now plastered) of the portico of Piazza San Carlo. This stone is a dolomitic rock belonging to the Mesozoic cover of the Dora Maira Massif (Pennidic Unit). It shows a vuggy fabric characterized by a vacuolar texture due to tectonic brecciation and subsequent selective dissolution during subaerial exposure. This kind of research is useful to highlight the importance of the use of local stones as building materials and to investigate stone materials for the restoration and maintenance of historical buildings.

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Section: Steps 3 Andmentioning

confidence: 95%

Section: The Palazzo Madama Façadementioning

confidence: 99%

Minero-Petrographic Characterization of Chianocco Marble Employed for Palazzo Madama Façade in Turin (Northwest Italy)

et al. 2019

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“…Interaction of the fluids with wall rocks gave sometimes rise to peculiar rock types called rauhwacke (in German), cornieule, cargneule (in French), carniola, calcare cavernoso (in Italian) or cellular dolomite/limestone. Special studies have been dedicated to these rocks mostly in the Alps, Pyrenees and Apennines (Warrak 1974;Jeanbourquin 1988;Amieux and Jeanbourquin 1989;Masi and Tucci 1993;Orozco et al 1999). Formation of these rocks due to basal thrusting was proposed by Leine (1968), Masson (1972), Jeanbourquin and Lualdi (1994).…”

Section: Introductionmentioning

confidence: 99%

Cathodoluminescence, fluid inclusion and stable C–O isotope study of tectonic breccias from thrusting plane of a thin-skinned calcareous nappe

Milovský

Kerkhof

Hoefs

et al. 2011

Int J Earth Sci (Geol Rundsch)

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Basal hydraulic breccias of alpine thin-skinned Muráň nappe were investigated by means of cathodoluminescence petrography, stable isotope geochemistry and fluid inclusions analysis. Our study reveals an unusual dynamic fluid regime along basal thrust plane during final episode of the nappe emplacement over its metamorphic substratum. Basal thrusting fluids enriched in 18 O, silica, alumina, alkalies and phosphates were generated in the underlying metamorphosed basement at epizonal conditions corresponding to the temperatures of 400-450°C. The fluids fluxed the tectonized nappe base, leached evaporitebearing formations in hangingwall, whereby becoming oversaturated with sulphates and chlorides. The fluids further modified their composition by dedolomitization and isotopic exchange with the host carbonatic cataclasites.Newly formed mineral assemblage of quartz, phlogopite, albite, potassium feldspar, apatite, dravite tourmaline and anhydrite precipitated from these fluids on cooling down to 180-200°C. Finally, the cataclastic mush was cemented by calcite at ambient anchizonal conditions. Recurrent fluid injections as described above probably enhanced the final motion of the Muráň nappe.

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“…Furthermore, for numerous geologists the cornieulization event is contemporaneous to very recent widespread dissolution-precipitation, diagenetic and epigenetic phenomena [20]. For example, in the Cogne valley, northern Gran Paradiso (North-Western Italian Alps), Carbon and Oxygen isotope studies on calcite within cornieules yielded values similar to those obtained in recently formed travertine deposits [21].…”

Section: Introductionmentioning

confidence: 99%

Dykes and Pipes of Remobilized Cornieules within the Cornieule Evaporitic-Complex of the Mont Jovet Area (Northwestern French Alps)

2010

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Dykes and pipes of remobilized cornieules outcrop widely within the evaporitic complex of the thrust sole of the Mont Jovet klippe, (NorthWestern French Alps). The morphology, nature, structures and pattern of these rocks are described. The bodies are not linked to erosive processes; they represent inherited morphologies within the gypsum exhumed by erosion. These upstanding pseudo-cornieules very likely originated from fault-related remobilization of primary cornieules from the tectonic contact. A genetic model is proposed to explain the genesis of these pseudocornieules, to highlight the possible relationships between these pseudo-cornieules and the other documented types of cornieules.

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Cathodoluminescence et origine diagenetique tardive des cargneules du massif des Aiguilles Rouges (Valais, Suisse)

Cited by 7 publications

References 0 publications

Minero-Petrographic Characterization of Chianocco Marble Employed for Palazzo Madama Façade in Turin (Northwest Italy)

Minero-Petrographic Characterization of Chianocco Marble Employed for Palazzo Madama Façade in Turin (Northwest Italy)

Cathodoluminescence, fluid inclusion and stable C–O isotope study of tectonic breccias from thrusting plane of a thin-skinned calcareous nappe

Dykes and Pipes of Remobilized Cornieules within the Cornieule Evaporitic-Complex of the Mont Jovet Area (Northwestern French Alps)

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