The contrasting origins of glauconite in the shallow marine environment highlight this mineral as a marker of paleoenvironmental conditions
Glauconite is an authigenic mineral reputed to form during long-lasting contact between a nucleus (a pre-existing phyllosilicate) and seawater. This protracted contact makes it possible to subtract the ions necessary for the construction of the neoformed phyllosilicate, here, glauconite (a mineral v...
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Académie des sciences
2022-12-01
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| Series: | Comptes Rendus. Géoscience |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.170/ |
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| author | Tribovillard, Nicolas Bout-Roumazeilles, Viviane Abraham, Romain Ventalon, Sandra Delattre, Marion Baudin, François |
| author_facet | Tribovillard, Nicolas Bout-Roumazeilles, Viviane Abraham, Romain Ventalon, Sandra Delattre, Marion Baudin, François |
| author_sort | Tribovillard, Nicolas |
| collection | DOAJ |
| description | Glauconite is an authigenic mineral reputed to form during long-lasting contact between a nucleus (a pre-existing phyllosilicate) and seawater. This protracted contact makes it possible to subtract the ions necessary for the construction of the neoformed phyllosilicate, here, glauconite (a mineral very close to an illite, rich in K and Fe). As a result, glauconite is often associated with sediments deposited in a transgressive context with a strong slowdown in the rate of sedimentation and a relatively large water layer thickness. This is the case of the Cenomanian chalk of Boulonnais (north of France). Being chemically and physically resistant, glauconite is a mineral that is often reworked, like quartz grains. This is frequently the case of the Jurassic deposits of the Boulonnais, where glauconite, almost ubiquitous, either in traces or in significant proportions of the sediments, presents a grain size sorting attesting to its transport and reworking. However, these Jurassic deposits are shallow (shoreface, upper offshore), which supports the idea that the “glauconite factory” was itself in the shallow areas of the Boulonnais. The only identified Jurassic facies of the Boulonnais where glauconite is both relatively abundant, large in size and unsorted (non reworked) are oyster reefs that formed at the outlet of cold seeps linked to a late-Jurassic synsedimentary tectonic (Kimmeridgian, Tithonian). Our work makes it possible to hypothesize that isolated oyster reefs were environments combining the redox conditions and in contact with seawater favoring the authigenic formation of glauconite. The weakly reducing conditions necessary for the formation of glauconite here are attested by the contents of metallic trace elements sensitive to redox conditions (vanadium, germanium, arsenic, in this case). Our work thus adds a new element to the understanding of the mechanisms of formation of glauconite in shallow environments. |
| format | Article |
| id | doaj-art-dda9fe2cce094749ab75bb4490f03688 |
| institution | Kabale University |
| issn | 1778-7025 |
| language | English |
| publishDate | 2022-12-01 |
| publisher | Académie des sciences |
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| series | Comptes Rendus. Géoscience |
| spelling | doaj-art-dda9fe2cce094749ab75bb4490f036882025-02-07T10:40:57ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252022-12-01355S221322810.5802/crgeos.17010.5802/crgeos.170The contrasting origins of glauconite in the shallow marine environment highlight this mineral as a marker of paleoenvironmental conditionsTribovillard, Nicolas0https://orcid.org/0000-0003-3493-5579Bout-Roumazeilles, Viviane1https://orcid.org/0000-0001-6917-818XAbraham, Romain2Ventalon, Sandra3Delattre, Marion4Baudin, François5https://orcid.org/0000-0003-3180-459XUniversité de Lille, UMR 8187 LOG – Laboratoire d’Océanologie et de Géosciences, Univ. Lille, CNRS, Univ. Littoral Côte d’Opale, IRD, 59000 Lille, FranceUniversité de Lille, UMR 8187 LOG – Laboratoire d’Océanologie et de Géosciences, Univ. Lille, CNRS, Univ. Littoral Côte d’Opale, IRD, 59000 Lille, FranceUniversité de Lille, UMR 8187 LOG – Laboratoire d’Océanologie et de Géosciences, Univ. Lille, CNRS, Univ. Littoral Côte d’Opale, IRD, 59000 Lille, FranceUniversité de Lille, UMR 8187 LOG – Laboratoire d’Océanologie et de Géosciences, Univ. Lille, CNRS, Univ. Littoral Côte d’Opale, IRD, 59000 Lille, FranceUniversité de Lille, UMR 8187 LOG – Laboratoire d’Océanologie et de Géosciences, Univ. Lille, CNRS, Univ. Littoral Côte d’Opale, IRD, 59000 Lille, FranceSorbonne Université - CNRS, Institut des Sciences de la Terre de Paris, UMR ISTeP 7193, 75005 Paris, FranceGlauconite is an authigenic mineral reputed to form during long-lasting contact between a nucleus (a pre-existing phyllosilicate) and seawater. This protracted contact makes it possible to subtract the ions necessary for the construction of the neoformed phyllosilicate, here, glauconite (a mineral very close to an illite, rich in K and Fe). As a result, glauconite is often associated with sediments deposited in a transgressive context with a strong slowdown in the rate of sedimentation and a relatively large water layer thickness. This is the case of the Cenomanian chalk of Boulonnais (north of France). Being chemically and physically resistant, glauconite is a mineral that is often reworked, like quartz grains. This is frequently the case of the Jurassic deposits of the Boulonnais, where glauconite, almost ubiquitous, either in traces or in significant proportions of the sediments, presents a grain size sorting attesting to its transport and reworking. However, these Jurassic deposits are shallow (shoreface, upper offshore), which supports the idea that the “glauconite factory” was itself in the shallow areas of the Boulonnais. The only identified Jurassic facies of the Boulonnais where glauconite is both relatively abundant, large in size and unsorted (non reworked) are oyster reefs that formed at the outlet of cold seeps linked to a late-Jurassic synsedimentary tectonic (Kimmeridgian, Tithonian). Our work makes it possible to hypothesize that isolated oyster reefs were environments combining the redox conditions and in contact with seawater favoring the authigenic formation of glauconite. The weakly reducing conditions necessary for the formation of glauconite here are attested by the contents of metallic trace elements sensitive to redox conditions (vanadium, germanium, arsenic, in this case). Our work thus adds a new element to the understanding of the mechanisms of formation of glauconite in shallow environments.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.170/JurassicCretaceousBoulonnaisOyster reefsRedox-proxies |
| spellingShingle | Tribovillard, Nicolas Bout-Roumazeilles, Viviane Abraham, Romain Ventalon, Sandra Delattre, Marion Baudin, François The contrasting origins of glauconite in the shallow marine environment highlight this mineral as a marker of paleoenvironmental conditions Comptes Rendus. Géoscience Jurassic Cretaceous Boulonnais Oyster reefs Redox-proxies |
| title | The contrasting origins of glauconite in the shallow marine environment highlight this mineral as a marker of paleoenvironmental conditions |
| title_full | The contrasting origins of glauconite in the shallow marine environment highlight this mineral as a marker of paleoenvironmental conditions |
| title_fullStr | The contrasting origins of glauconite in the shallow marine environment highlight this mineral as a marker of paleoenvironmental conditions |
| title_full_unstemmed | The contrasting origins of glauconite in the shallow marine environment highlight this mineral as a marker of paleoenvironmental conditions |
| title_short | The contrasting origins of glauconite in the shallow marine environment highlight this mineral as a marker of paleoenvironmental conditions |
| title_sort | contrasting origins of glauconite in the shallow marine environment highlight this mineral as a marker of paleoenvironmental conditions |
| topic | Jurassic Cretaceous Boulonnais Oyster reefs Redox-proxies |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.170/ |
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