File:Hematitic sylvitite (Cardona Saline Formation, Upper Eocene; Cardona Diapir, Cardona, Catalonia, Spain) 8.jpg
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English: Hematitic sylvitite from the Eocene of Spain.
Seen here is sylvitite, a scarce evaporite rock. Evaporites are crystalline-textured, chemical sedimentary rocks that form by the evaporation of water (usually seawater) and the precipitation of dissolved minerals. The most common evaporites are rock salt (halitite), which is composed of the mineral halite (NaCl - sodium chloride), and rock gypsum (gyprock), which is composed of the mineral gypsum (CaSO4·H2O - hydrous calcium sulfate). Scarce evaporites include rock anhydrite and sylvitite. Sylvitite is composed of the mineral sylvite - KCl, potassium chloride. Halite has a salty taste, but sylvite (and sylvitite) have a strongly bitter salty taste. The reddish coloration of the sample is due to hematite inclusions (hematite = Fe2O3 - iron oxide). This sylvitite is part of an evaporite succession in northeastern Spain called the Cardona Saline Formation (Upper Eocene). This unit has rock anhydrite and rock salt (halitite) and sylvitite. The latter two lithologies do not compact when deeply buried - they famously "bloop" upward as diapirs, or salt domes. Salt domes are moderately common in the Gulf of Mexico. They are also known in northeastern Spain. This rock comes from the Cardona Diapir. Diapirism occurred in the Early Oligocene, during Pyrenean orogenesis and regional deformation. The Pyrenees Mountains are a collision zone mountain belt between Spain and France. Stratigraphy: Upper Evaporitic Member, Cardona Saline Formation, Priabonian Stage, upper Upper Eocene Locality: unrecorded site in the Cardona Diapir (Cardona Salt Diapir) - likely from a subsurface mine, Salt Mountain, southeastern side of the town of Cardona, Barcelona Province, Catalonia, far-northeastern Spain |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50954764432/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50954764432. It was reviewed on 19 February 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 21:45, 19 February 2021 | | 1,988 × 1,299 (3 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50954764432/ with UploadWizard |
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