File:Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Nordfjord area, Sogn og Fjordane County, Norway) 1 (14911297738).jpg
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Summary
editDescriptionEclogite (Late Silurian to Early Devonian, ~400-423 Ma; Nordfjord area, Sogn og Fjordane County, Norway) 1 (14911297738).jpg |
Eclogite from the Middle Paleozoic of Norway. (6.1 centimeters across at its widest) Eclogite is an attractive, uncommon, crystalline-textured, very high-grade metamorphic rock. It is dominated by green & red minerals. The red is pyrope or almandine garnet. The green is omphacite pyroxene. Eclogite appears to be moderately common in portions of the upper mantle, but it occurs in very few places at the Earth’s surface. They have the same chemistry, but different mineralogy, as basalts & gabbros (= oceanic crustal rocks). Eclogites form by very high grade metamorphism of oceanic crust (basalts & gabbros) at mantle depths along subduction zones. Uplift of eclogites back to the surface often involves some retrograde metamorphism and the formation of new minerals, resulting in retrograde eclogites. The eclogite shown above represents Late Silurian to Early Devonian (~400-423 million years old) very high-grade burial metamorphism (mantle depths) of a Proterozoic protolith. Metamorphism took place during the Scandian Orogeny (oceanic lithosphere adjacent to ancient Baltica was subducting beneath Laurentia - the ancient North American-Greenland continent). The eclogite was brought back to upper crustal levels during the Devonian phase of the Caledonian Orogeny (~383-404 Ma). Locality: Nordfjord area (Sogn og Fjordane County), southwestern Norway |
Date | |
Source | Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Nordfjord area, Sogn og Fjordane County, Norway) 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@N05/14911297738 (archive). It was reviewed on 11 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
11 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:20, 11 December 2019 | 898 × 833 (937 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Pixel composition | RGB |
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Orientation | Normal |
Horizontal resolution | 375 dpi |
Vertical resolution | 375 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 16:25, 31 August 2014 |
Color space | Uncalibrated |
Image width | 898 px |
Image height | 833 px |
Date and time of digitizing | 12:23, 31 August 2014 |
Date metadata was last modified | 12:25, 31 August 2014 |