File:Serpentinite (Livengood Ophiolite, Early Cambrian; near Livengood, Alaska, USA) 1.jpg
![File:Serpentinite (Livengood Ophiolite, Early Cambrian; near Livengood, Alaska, USA) 1.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/55/Serpentinite_%28Livengood_Ophiolite%2C_Early_Cambrian%3B_near_Livengood%2C_Alaska%2C_USA%29_1.jpg/800px-Serpentinite_%28Livengood_Ophiolite%2C_Early_Cambrian%3B_near_Livengood%2C_Alaska%2C_USA%29_1.jpg?20221112185429)
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[edit]DescriptionSerpentinite (Livengood Ophiolite, Early Cambrian; near Livengood, Alaska, USA) 1.jpg |
English: Serpentinite in the Cambrian of Alaska, USA. (photo provided by James Cheshire)
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. Serpentinite is a low- to high-grade metamorphic rock formed by alteration of olivine-rich peridotites (dunites - ultramafic, phaneritic, intrusive igneous rocks). Metamorphism of olivine in the presence of water results in the formation of the mineral serpentine (Mg3Si2O5(OH)4). A metamorphic rock composed principally of serpentine is thus a serpentinite. Serpentinite has a mottled greenish color, often has the look & feel of hard candle wax, and ranges in texture from crystalline to “foliated”. Many serpentinites have a foliated look to them, but it’s really not due to an planar alignment of crystals. The appearance of “foliated” serpentinites is really the result of extensive development of slickenlined surfaces. Many serpentinites also have a small component of magnetite that is usually significant enough to feel a slight tug when a magnet is placed next to the rock. Most Precambrian greenstone belts have significant occurrences of serpentinites. Slices of dunitic mantle caught up in orogenic belts by obduction (= ophiolites) are often serpentinized. Sometimes, mantle peridotite masses that were caught up in rising magmas have been serpentinized (for example, in kimberlites & lamproites). Geologic unit: Livengood Ophiolite, Early Cambrian Locality: boulder near the town of Livengood, Alaska, USA |
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Source | https://www.flickr.com/photos/47445767@N05/51741573874/ |
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@N05/51741573874. It was reviewed on 15 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
15 November 2022
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current | 18:54, 12 November 2022 | ![]() | 3,200 × 2,400 (7.3 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51741573874/ with UploadWizard |
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Camera manufacturer | OLYMPUS IMAGING CORP. |
Camera model | E-500 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/4.5 |
ISO speed rating | 100 |
Date and time of data generation | Unknown date |
Lens focal length | 28 mm |
Width | 3,200 px |
Height | 2,400 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 314 dpi |
Vertical resolution | 314 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 15:06, 11 December 2021 |
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Y and C positioning | Co-sited |
Exposure Program | Creative program (biased toward depth of field) |
Exif version | 2.21 |
Date and time of digitizing | Unknown date |
Meaning of each component |
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APEX shutter speed | 5.906891 |
APEX aperture | 4.33985 |
APEX exposure bias | −0.3 |
Maximum land aperture | 3.61328125 APEX (f/3.5) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | Uncalibrated |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 56 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | High saturation |
Sharpness | Normal |
Serial number of camera | A78571019 |
Lens used | 14.0-45.0 mm f/3.5-5.6 |
Date metadata was last modified | 10:06, 11 December 2021 |
Unique ID of original document | 35D430A7B4E464A5EA0BEADF678F2AB6 |
IIM version | 32,660 |