File:Glaucophane-bearing schist (Attic-Cycladic Crystalline Complex, Cretaceous to Eocene metamorphism, 78 to 42 Ma; Siphnos Island, Aegean Sea) 5.jpg
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| Description |
English: Very dark blue blades = glaucophane
Pale yellowish blades = kyanite Pale greenish matrix = ? (epidote or amphibole or pyroxene or lawsonite) This is a coarsely-crystalline, glaucophane-bearing schist from the island of Siphnos in the Aegean Sea. It has very dark blue crystals of glaucophane (Na2(Mg3Al2)Si8O22(OH)2 - sodium magnesium hydroxy-aluminosilicate), a common mineral found in blueschist facies metamorphic rocks. This rock has been significantly altered from its precursor (protolith). Published research on Siphnos metamorphics indicates that the protolith was likely basaltic and andesitic lavas mixed with marine shales. Many islands in the Aegean Sea between Greece and Turkey have high-grade metamorphic rocks, the result of a tectonic collision between the Apulia Microplate with the Eurasian Plate in the late Mesozoic to early Cenozoic. Geologic unit & metamorphic age: lower unit of the Attic-Cycladic Crystalline Complex; high-pressure metamorphism in the Late Cretaceous to Middle Eocene (78 to 42 Ma) Locality: northwestern end of Siphnos Island, western Cycladic Islands, southwestern Aegean Sea |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50723527943/ |
| 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@N05/50723527943. It was reviewed on 15 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 22:18, 15 December 2020 | | 2,610 × 2,429 (5.3 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50723527943/ with UploadWizard |
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