File:Calcite pseudomorph after gypsum, Hettangian, Saint-Chinian.jpg
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Summary[edit]
| Description |
English: Polished vertical section of the surface of a continental sedimentary deposit of sebkha type.
The sediment is made up of fine-grained dolomite in which small crystals and micro-nodules are visible. The central rectangle was subjected to a 5% HCL solution for 1 minute at a temperature of 20° Celsius. Attack by HCl demonstrates that the small crystals are calcite pseudomorphs after gypsum and micro-nodules are calcite pseudomorphs after gypsum or anhydrite The dolomite was only lightly attacked. The calcite, on the contrary, was severely attacked and disappeared over a much greater thickness. Stage : Hettangian, Early Jurassic Locality : Saint-Chinian, Southern FranceFrançais : Section verticale polie de la surface d'un dépôt sédimentaire continental de type sebkha.
Le sédiment est constitué de dolomite à grains fins dans laquelle sont visibles de petits cristaux et des micro-nodules. Le rectangle central a été soumis à l'action d'une solution d'HCl à 5% durant une minute à la température de 20°C. L'attaque par HCl démontre que les petits cristaux sont des pseudomorphoses : calcite après gypse, et que les micro-nodules sont également des pseudomorphoses : calcite après gypse ou anhydrite.La dolomite n'a été que très légèrement attaquée. La calcite, au contraire a été sévèrement attaquée et a disparu sur une épaisseur bien plus importante. Etage : Hettangien, Jurassique Inférieur. Localité : Chaînon de Saint-Chinian, Hérault (34)English: Calcite pseudomorph after gypsum, Hettangian, Saint-Chinian (France). |
| Date | |
| Source | Own work |
| Author | Benoit Potin |
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This file was uploaded as part of Wiki Science Competition 2023. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:44, 8 December 2023 | | 4,280 × 3,208 (6.83 MB) | Benoit Potin (talk | contribs) | Uploaded own work with UploadWizard |
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