File:Peridotite mantle xenolith in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 11.jpg
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[edit]DescriptionPeridotite mantle xenolith in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 11.jpg |
English: Peridotite mantle xenolith in phonotephrite from the Pleistocene of Arizona, USA.
Green = peridotite Gray = phonotephrite host rock “Peridot” is a gemological term for gem-quality forsterite olivine, but it does not differ in any chemical sense from ordinary olivine. Gem-quality olivine is known from several places on Earth, including Peridot Mesa in southeastern Arizona, USA. The volcanic rocks making up Peridot Mesa are gray, slightly vesicular phonotephrites (formerly misidentified as basanites) of the Peridot Mesa Flow, a 3 to 35 meter thick lava flow erupted during the Middle Pleistocene (~580,000 years ago). The Peridot Mesa lavas have common greenish-colored xenoliths derived from the mantle. The xenoliths are ultramafic, crystalline-textured, intrusive igneous rocks principally composed of olivine and/or pyroxene. Specific Peridot Mesa xenolith lithologies include spinel lherzolite, dunite, harzburgite, clinopyroxenite, websterite, and orthopyroxenite. The green xenolith shown here appears to be spinel lherzolite or spinel dunite, dominated by lime green-colored, glassy-lustered forsterite olivine (Mg2SiO4). Other minerals include bright green chromian diopside pyroxene ((Ca,Cr)MgSi2O6), and black spinel (MgAl2O4). Some of the green olivine crystals in Peridot Mesa mantle xenoliths are large enough, transparent enough, and richly green enough to be gem quality ("peridot"). Stratigraphy: Peridot Mesa Flow, middle Middle Pleistocene, ~580 ka Locality: Peridot Mesa, San Carlos Volcanic Field, San Carlos Apache Reservation, southeastern margin of Gila County, southeastern Arizona, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/30864231107/ |
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@N05/30864231107. It was reviewed on 30 March 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
30 March 2022
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current | 13:43, 30 March 2022 | 2,063 × 2,110 (3.36 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/30864231107/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 17:20, 9 November 2018 |
Lens focal length | 9.681 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 20:43, 9 November 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 17:20, 9 November 2018 |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.65625 |
APEX exposure bias | −1 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 15:43, 9 November 2018 |
Unique ID of original document | 6B826781559D74B199DE6D2EF26B62BA |