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Original file (2,721 × 2,280 pixels, file size: 5.11 MB, MIME type: image/jpeg)
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Summary
| Description |
English: Garnetiferous blueschist from the Mesozoic of California, USA.
Blueschist (a.k.a. glaucophane schist; a.k.a. glaucophanite) is a scarce, glaucophane-rich rock. It's a classic example of a low-temperature, high-pressure metamorphic rock. The bluish material is the mineral glaucophane (Na2Mg3Al2Si8O22(OH)2 - sodium magnesium hydroxy-aluminosilicate). Calling this lithology a “schist” is misleading, because many samples lack a schistose texture. Blueschist forms by burial metamorphism of basaltic oceanic crust in subduction zones. This is a crack surface of a gravel clast from a stream in California. It is likely derived from an outcrop in the Mesozoic-aged Franciscan Complex, which is principally a serpentinitic melange. Blueschist "knockers" occur in the complex. Locality: Ward Creek, western Sonoma County, western California, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50514274328/ |
| Author | James St. John |
Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50514274328. It was reviewed on 22 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:50, 22 October 2020 | | 2,721 × 2,280 (5.11 MB) | Ser Amantio di Nicolao | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50514274328/ with UploadWizard |
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