File:Gypsum speleothem (Rose's Pass, Mammoth Cave, Kentucky, USA) 1 (37962044306).jpg
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| Description |
Western Kentucky's Mammoth Cave is the longest cave system in the world. As of fall 2017, 412 miles worth of passages are known and mapped. Mammoth Cave has relatively little speleothem ("cave formations"), which refers to all secondary mineral deposits in a cave. Most of the speleothem that is present is travertine (composed of calcite - CaCO3 - calcium carbonate) and gypsum (CaSO4·2H2O - hydrous calcium sulfate). Shown above is gypsum speleothem in Rose's Pass, a canyon passage in Mammoth Cave Ridge. Canyon passages are taller than they are wide, and are vadose in origin - they form above water table. The sulfur in the gypsum is derived from pyrite in an overlying unit. Downward-percolating water oxidized the pyrite (FeS2 - iron sulfide - "fool's gold") and produced sulfuric acid (H2SO4). The acid dissolved part of the limestone, which liberated calcium (Ca). In the presence of water, the calcium and the sulfate (SO4) produced gypsum. Rose's Pass is accessible to modern tourists on the Grand Avenue Tour and the Wild Cave Tour. |
| Date | |
| Source | Gypsum speleothem (Rose's Pass, Mammoth Cave, Kentucky, USA) 1 |
| 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@N05/37962044306 (archive). It was reviewed on 13 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:45, 13 October 2019 | | 4,000 × 3,000 (4.78 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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