File:Eclogite (Muenchberg Gneiss Massif; Early Ordovician protolith, about 480 Ma; Late Devonian metamorphism, about 365 Ma; Wissenstein, just south of Stammbach, Frankenwald Forest, Bavaria, southeast-central Germany) 1 (15097930745).jpg
Original file (734 × 837 pixels, file size: 855 KB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]_1_(15097930745).jpg&action=edit§ion=1){kind=link}
| Description |
Eclogite from the Devonian of Germany. (7.4 centimeters across along the base) 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 is from the Devonian of Germany. It formed by deep burial metamorphism of near-earliest Ordovician mafic igneous rock during the Devonian Hercynian (Variscan) Orogeny. Geologic unit & age: Münchberg (Muenchberg) Gneiss Massif; protolith age - early Early Ordovician (~480 Ma); metamorphic age - late Late Devonian (~365 Ma) Locality: Weissenstein (Weißenstein), a hill just south of the town of Stammbach, Frankenwald Forest, Bavaria, southeast-central Germany (~50° 07’ 48” North, ~11° 41’ 27” East). The host rocks for eclogite at this locality include amphibolite, gneiss, and marble. |
| Date | |
| Source | Eclogite (Muenchberg Gneiss Massif; Early Ordovician protolith, about 480 Ma; Late Devonian metamorphism, about 365 Ma; Wissenstein, just south of Stammbach, Frankenwald Forest, Bavaria, southeast-central Germany) 1 |
| Author | James St. John |
Licensing
[edit]_1_(15097930745).jpg&action=edit§ion=2){kind=link}
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
|
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15097930745 (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. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:21, 11 December 2019 | | 734 × 837 (855 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
_1_(15097930745).jpg&oldid=949128159){kind=link}