File:Toxic serpentine soil (Livengood Ophiolite, Early Cambrian; near Livengood, Alaska, USA).jpg
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English: (photo by James Cheshire)
Click on the photo once or twice to zoom in - the barren patches of hillside in the distance consist of naturally-toxic soil developed on weathered serpentinite. Few plants grow in such soils; the few that do are usually rare species. Serpentinite is a low- to high-grade metamorphic rock dominated by serpentine, a group of magnesium hydroxy-silicate minerals - antigorite, lizardite, and chrysotile (Mg3Si2O5(OH)4). This rock forms by metamorphism of olivine-rich peridotite in the presence of water. See: www.flickr.com/photos/jsjgeology/albums/72157694829360531 In the Alaskan landscape seen here, serpentinite and other metamorphics make up the bedrock - such outcrop belts are called ophiolites, which consist of obducted oceanic lithosphere. Obduction is the opposite of subduction - oceanic lithosphere gets pushed up and onto continental lithosphere, whereas normal subduction involves oceanic lithosphere diving deep into the Earth's mantle. Geologic unit: Livengood Ophiolite, Early Cambrian Locality: hillsides near the town of Livengood, east-central Alaska, USA Info. at: en.wikipedia.org/wiki/Serpentine_soil |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52180761660/ |
| 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@N05/52180761660. It was reviewed on 15 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 18:55, 12 November 2022 | | 3,200 × 1,475 (4.3 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52180761660/ with UploadWizard |
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