Les calcites de Fontainebleau, Seine-et-Marne, et autres calcites sableuses revisitées .
International audience In the second half of the 18th century, private French collections furnished much precious material for the description and definition of mineral species, leading to the recognition of Mineralogy as a true science. The discovery of Fontainebleau calcite at this time played its...
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ftunivnantes:oai:HAL:hal-03059223v1 2023-05-15T17:58:16+02:00 Les calcites de Fontainebleau, Seine-et-Marne, et autres calcites sableuses revisitées . Thiry, Médard de Ascenção Guedes, Roger Chiappero, Pierre-Jacques Martaud, Alain Centre de Géosciences (GEOSCIENCES) Mines Paris - PSL (École nationale supérieure des mines de Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) 2020-12-02 https://hal-mines-paristech.archives-ouvertes.fr/hal-03059223 fr fre HAL CCSD Editions du Piat hal-03059223 https://hal-mines-paristech.archives-ouvertes.fr/hal-03059223 ISSN: 1259-4415 Le Règne Minéral https://hal-mines-paristech.archives-ouvertes.fr/hal-03059223 Le Règne Minéral, Editions du Piat, 2020, Le règne Minéral, pp.7-36 https://www.leregnemineral.fr calcite calcite sableuse collection minéralogie pétrographie habitus paléoenvironnement modèle précipiation Fontainebleau France [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy info:eu-repo/semantics/article Journal articles 2020 ftunivnantes 2022-10-18T23:37:24Z International audience In the second half of the 18th century, private French collections furnished much precious material for the description and definition of mineral species, leading to the recognition of Mineralogy as a true science. The discovery of Fontainebleau calcite at this time played its part in the dynamics of the Enlightenment (“Siecle des Lumières”). The “BelleCroix” calcites, as they were then called, from the Fontainebleau forest in the Seine-et-Marne department of France figured among the first geological publications. Any self-respecting collection of minerals had to include a sample, and specimens of this “French super classic” are still to be seen in museums worldwide. Fontainebleau may be considered to be a sort of “type locality” for this type of calcite crystal with included sand grains. The aim of this article is to reexamine the historical and geological context of these sandy calcites with their highly individual aesthetics and their place in collections. Such crystallizations can still be found in the “Fontainebleau sandstones” of the Paris basin. Geologically, these sand calcite crystals and nodules in the unconsolidated Tertiary sand formations of the Paris basin are of Pleistocene age and correlate strongly with periods of glaciation. Their occurrence and distribution suggest deposition from palaeo-groundwaters under conditions of permafrost. The nodular sandy calcites formed at shallow depths where waters infiltrated features ascribed to themokarsts. Individual sand calcite crystals and groups formed in deeper parts of the profile where infiltration was slow. Sometimes their distribution in horizontal layers indicates the level of the palaeowater tables. Crystallisation of sand calcites was triggered by the degassing of cold carbonate-containing surface waters as they infiltrated warmer subsurface groundwater environments.From a palaeoenvironmental point of view, the sand calcites of the Paris Basin furnish important clues to the interactions between meteoric and ground waters ... Article in Journal/Newspaper permafrost Université de Nantes: HAL-UNIV-NANTES |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
French |
topic |
calcite calcite sableuse collection minéralogie pétrographie habitus paléoenvironnement modèle précipiation Fontainebleau France [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
spellingShingle |
calcite calcite sableuse collection minéralogie pétrographie habitus paléoenvironnement modèle précipiation Fontainebleau France [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy Thiry, Médard de Ascenção Guedes, Roger Chiappero, Pierre-Jacques Martaud, Alain Les calcites de Fontainebleau, Seine-et-Marne, et autres calcites sableuses revisitées . |
topic_facet |
calcite calcite sableuse collection minéralogie pétrographie habitus paléoenvironnement modèle précipiation Fontainebleau France [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
description |
International audience In the second half of the 18th century, private French collections furnished much precious material for the description and definition of mineral species, leading to the recognition of Mineralogy as a true science. The discovery of Fontainebleau calcite at this time played its part in the dynamics of the Enlightenment (“Siecle des Lumières”). The “BelleCroix” calcites, as they were then called, from the Fontainebleau forest in the Seine-et-Marne department of France figured among the first geological publications. Any self-respecting collection of minerals had to include a sample, and specimens of this “French super classic” are still to be seen in museums worldwide. Fontainebleau may be considered to be a sort of “type locality” for this type of calcite crystal with included sand grains. The aim of this article is to reexamine the historical and geological context of these sandy calcites with their highly individual aesthetics and their place in collections. Such crystallizations can still be found in the “Fontainebleau sandstones” of the Paris basin. Geologically, these sand calcite crystals and nodules in the unconsolidated Tertiary sand formations of the Paris basin are of Pleistocene age and correlate strongly with periods of glaciation. Their occurrence and distribution suggest deposition from palaeo-groundwaters under conditions of permafrost. The nodular sandy calcites formed at shallow depths where waters infiltrated features ascribed to themokarsts. Individual sand calcite crystals and groups formed in deeper parts of the profile where infiltration was slow. Sometimes their distribution in horizontal layers indicates the level of the palaeowater tables. Crystallisation of sand calcites was triggered by the degassing of cold carbonate-containing surface waters as they infiltrated warmer subsurface groundwater environments.From a palaeoenvironmental point of view, the sand calcites of the Paris Basin furnish important clues to the interactions between meteoric and ground waters ... |
author2 |
Centre de Géosciences (GEOSCIENCES) Mines Paris - PSL (École nationale supérieure des mines de Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
Thiry, Médard de Ascenção Guedes, Roger Chiappero, Pierre-Jacques Martaud, Alain |
author_facet |
Thiry, Médard de Ascenção Guedes, Roger Chiappero, Pierre-Jacques Martaud, Alain |
author_sort |
Thiry, Médard |
title |
Les calcites de Fontainebleau, Seine-et-Marne, et autres calcites sableuses revisitées . |
title_short |
Les calcites de Fontainebleau, Seine-et-Marne, et autres calcites sableuses revisitées . |
title_full |
Les calcites de Fontainebleau, Seine-et-Marne, et autres calcites sableuses revisitées . |
title_fullStr |
Les calcites de Fontainebleau, Seine-et-Marne, et autres calcites sableuses revisitées . |
title_full_unstemmed |
Les calcites de Fontainebleau, Seine-et-Marne, et autres calcites sableuses revisitées . |
title_sort |
les calcites de fontainebleau, seine-et-marne, et autres calcites sableuses revisitées . |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal-mines-paristech.archives-ouvertes.fr/hal-03059223 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
ISSN: 1259-4415 Le Règne Minéral https://hal-mines-paristech.archives-ouvertes.fr/hal-03059223 Le Règne Minéral, Editions du Piat, 2020, Le règne Minéral, pp.7-36 https://www.leregnemineral.fr |
op_relation |
hal-03059223 https://hal-mines-paristech.archives-ouvertes.fr/hal-03059223 |
_version_ |
1766166839763664896 |