Guide of the Geological curiosities of the Fontainebleau massif.
National audience Since the beginnings of geology in the XVIIIth century, the massif of Fontainebleau has been a melting pot of new ideas. It has several remarkable geological features: extensive linear quartzite ridges, spectacular quartzite lenses within uncemented white sands, outstanding Calcite...
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ftccsdartic:oai:HAL:hal-01627445v1 2023-05-15T18:31:05+02:00 Guide of the Geological curiosities of the Fontainebleau massif. Curiosités géologiques du massif de Fontainebleau. Thiry, Médard Liron, Marie Nieves Dubreucq, Patrick Polton, Jean-Claude Centre de Géosciences (GEOSCIENCES) MINES ParisTech - École nationale supérieure des mines de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) 2017-10-05 https://hal.archives-ouvertes.fr/hal-01627445 fr fre HAL CCSD BRGM Editions ISBN: 978-2-7159-2658-5 hal-01627445 https://hal.archives-ouvertes.fr/hal-01627445 https://hal.archives-ouvertes.fr/hal-01627445 BRGM Editions, 115 p., 2017, 978-2-7159-2658-5 Paleoenvironment Silicification Paleoweathering Geomorpholoy Sandstone Fontainebleau geological guide biodiversité géomorphologie Quaternaire Bassin de Paris géologie guide paléoaltération Paris Basin grès paléoenvironnement sédimentologie [SDE]Environmental Sciences [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/book Books 2017 ftccsdartic 2021-11-21T02:19:28Z National audience Since the beginnings of geology in the XVIIIth century, the massif of Fontainebleau has been a melting pot of new ideas. It has several remarkable geological features: extensive linear quartzite ridges, spectacular quartzite lenses within uncemented white sands, outstanding Calcite de Fontainebleau sand calcite crystals, and also a rare biodiversity due to a juxtaposition of contrasted landscapes.This guide presents a geological history revised in the light of the evolution of geological knowledge. It shows that the Fontainebleau quartzites are not related to the deposition of sands some 35 million years ago, but formed in geological recent landscapes less than 500 000 years ago, after the original sands were exposed and incised by rivers. The characteristic facies of the sands are due to subsurface alteration in Quaternary periglacial environments. The quartzites formed behind springs at the edges of valleys, where groundwater cooled when it came into contact with frozen ground. The sand calcites precipitated when cold surface waters infiltrated the landscape, warming as they seeped to depth and came into contact with groundwaters. Sands were leached and bleached by the infiltration of acidic organic-rich waters that originated in organic-rich soils in the tundra taiga environments. The brittle fractures that spectacularly cut quartzite pans occur only in outcrop resulted most probably from successive shrink-swell thermal effects.The guide shows how new data can change old ideas and initiate new concepts that gradually generate a quite new geological model. The remarkable aspects of the geology of the Fontainebleau massif are explained by its evolution during the Quaternary glacial periods. This model gives coherency to observations that initially seemed to be quite independent of each other.The model now proposed for the Fontainebleau massif applies to the other Tertiary sand formations of the Paris Basin, all of which are characterised by white sands with quartzite lenses and sand calcite ... Book taiga Tundra Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
Paleoenvironment Silicification Paleoweathering Geomorpholoy Sandstone Fontainebleau geological guide biodiversité géomorphologie Quaternaire Bassin de Paris géologie guide paléoaltération Paris Basin grès paléoenvironnement sédimentologie [SDE]Environmental Sciences [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Paleoenvironment Silicification Paleoweathering Geomorpholoy Sandstone Fontainebleau geological guide biodiversité géomorphologie Quaternaire Bassin de Paris géologie guide paléoaltération Paris Basin grès paléoenvironnement sédimentologie [SDE]Environmental Sciences [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Thiry, Médard Liron, Marie Nieves Dubreucq, Patrick Polton, Jean-Claude Guide of the Geological curiosities of the Fontainebleau massif. |
topic_facet |
Paleoenvironment Silicification Paleoweathering Geomorpholoy Sandstone Fontainebleau geological guide biodiversité géomorphologie Quaternaire Bassin de Paris géologie guide paléoaltération Paris Basin grès paléoenvironnement sédimentologie [SDE]Environmental Sciences [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
National audience Since the beginnings of geology in the XVIIIth century, the massif of Fontainebleau has been a melting pot of new ideas. It has several remarkable geological features: extensive linear quartzite ridges, spectacular quartzite lenses within uncemented white sands, outstanding Calcite de Fontainebleau sand calcite crystals, and also a rare biodiversity due to a juxtaposition of contrasted landscapes.This guide presents a geological history revised in the light of the evolution of geological knowledge. It shows that the Fontainebleau quartzites are not related to the deposition of sands some 35 million years ago, but formed in geological recent landscapes less than 500 000 years ago, after the original sands were exposed and incised by rivers. The characteristic facies of the sands are due to subsurface alteration in Quaternary periglacial environments. The quartzites formed behind springs at the edges of valleys, where groundwater cooled when it came into contact with frozen ground. The sand calcites precipitated when cold surface waters infiltrated the landscape, warming as they seeped to depth and came into contact with groundwaters. Sands were leached and bleached by the infiltration of acidic organic-rich waters that originated in organic-rich soils in the tundra taiga environments. The brittle fractures that spectacularly cut quartzite pans occur only in outcrop resulted most probably from successive shrink-swell thermal effects.The guide shows how new data can change old ideas and initiate new concepts that gradually generate a quite new geological model. The remarkable aspects of the geology of the Fontainebleau massif are explained by its evolution during the Quaternary glacial periods. This model gives coherency to observations that initially seemed to be quite independent of each other.The model now proposed for the Fontainebleau massif applies to the other Tertiary sand formations of the Paris Basin, all of which are characterised by white sands with quartzite lenses and sand calcite ... |
author2 |
Centre de Géosciences (GEOSCIENCES) MINES ParisTech - École nationale supérieure des mines de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) |
format |
Book |
author |
Thiry, Médard Liron, Marie Nieves Dubreucq, Patrick Polton, Jean-Claude |
author_facet |
Thiry, Médard Liron, Marie Nieves Dubreucq, Patrick Polton, Jean-Claude |
author_sort |
Thiry, Médard |
title |
Guide of the Geological curiosities of the Fontainebleau massif. |
title_short |
Guide of the Geological curiosities of the Fontainebleau massif. |
title_full |
Guide of the Geological curiosities of the Fontainebleau massif. |
title_fullStr |
Guide of the Geological curiosities of the Fontainebleau massif. |
title_full_unstemmed |
Guide of the Geological curiosities of the Fontainebleau massif. |
title_sort |
guide of the geological curiosities of the fontainebleau massif. |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.archives-ouvertes.fr/hal-01627445 |
genre |
taiga Tundra |
genre_facet |
taiga Tundra |
op_source |
https://hal.archives-ouvertes.fr/hal-01627445 BRGM Editions, 115 p., 2017, 978-2-7159-2658-5 |
op_relation |
ISBN: 978-2-7159-2658-5 hal-01627445 https://hal.archives-ouvertes.fr/hal-01627445 |
_version_ |
1766214735222538240 |