File:Greenstone 1.jpg
Original file (1,415 × 1,168 pixels, file size: 2.55 MB, MIME type: image/jpeg)
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Summary
editDescriptionGreenstone 1.jpg |
English: Greenstone (9.0 cm across at its widest)
Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy. Greenstone is one of several greenish-colored metamorphic rocks. It is typically composed of epidote, chlorite, and plagioclase feldspar. Greenstones are supposed to have a crystalline texture, but some are weakly foliated (but not enough to be called schist). Greenstones are the result of low-grade to intermediate-grade metamorphism of basalts or gabbros. They are relatively common rocks in greenstone belts in Precambrian shield areas. Many greenstones still preserve physical aspects of the original basalt lavas (for example, vesiculation or pillow lava geometry). Some greenstones have been interpreted to be metamorphosed graywackes (dirty sandstones rich in mafic minerals). |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/16272258254/ |
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@N05/16272258254 (archive). It was reviewed on 10 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 March 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:45, 10 March 2020 | 1,415 × 1,168 (2.55 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/16272258254/ with UploadWizard |
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Metadata
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.
Width | 1,415 px |
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Height | 1,168 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 400 dpi |
Vertical resolution | 400 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 11:27, 22 March 2015 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | 9D9CAD99CCA402AFABF8D2420878B365 |
Date and time of digitizing | 07:24, 22 March 2015 |
Date metadata was last modified | 07:27, 22 March 2015 |