File:Anorthoclase crystal from kenyte lava (Late Pleistocene or Holocene; summit cone of Mt. Erebus Volcano, Ross Island, Antarctica) 4.jpg
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[edit]DescriptionAnorthoclase crystal from kenyte lava (Late Pleistocene or Holocene; summit cone of Mt. Erebus Volcano, Ross Island, Antarctica) 4.jpg |
English: Anorthoclase crystal from the Quaternary of Antarctica.
Mt. Erebus is the only active volcano in Antarctica. It is a 1.3 million year old, polygenetic stratovolcano in the West Antarctic Rift System. It has erupted basanite, trachyte, tephriphonolite, and phonolite (kenyte) lavas during its history. The summit cone of Erebus has an anorthoclase phenocryst gravel lag, derived from weathering and erosion of kenyte lava, the 2nd-rarest lava type on Earth (Mt. Kenya Volcano in eastern Africa also has kenyte). Kenyte is a porphyritic phonolite having anorthoclase feldspar phenocrysts and a glassy to cryptocrystalline groundmass. Anorthoclase is a type of feldspar, (Na,K)AlSi3O8) - sodium potassium aluminosilicate. This anorthoclase phenocryst has a coating of weathered, highly vesiculated, glassy kenyte. The lava from which the crystal derives is Late Pleistocene or Holocene in age (I’m not sure which). Locality: Mt. Erebus Volcano, western Ross Island, Ross Sea, Antarctica (77º 31’ 51” South latidude, 167º 08’ 40” East longitude) |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/53548546936/ |
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@N05/53548546936. It was reviewed on 26 March 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
26 March 2024
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current | 16:49, 26 March 2024 | 2,566 × 1,077 (2.45 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53548546936/ with UploadWizard |
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Camera manufacturer | Canon |
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F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 16:24, 23 February 2024 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
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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 20.0 (Macintosh) |
File change date and time | 02:37, 24 February 2024 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 16:24, 23 February 2024 |
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APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
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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 | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 21:37, 23 February 2024 |
Unique ID of original document | 26489B2EA59C8C943EC2B063A43F6FD5 |