File:Porphyritic rhyodacite (O'Leary Porphyry, Middle Pleistocene; O'Leary Peak, Arizona, USA) (27745649518).jpg
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[edit]DescriptionPorphyritic rhyodacite (O'Leary Porphyry, Middle Pleistocene; O'Leary Peak, Arizona, USA) (27745649518).jpg |
Porphyritic rhyodacite from the Pleistocene of Arizona, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA) This volcanic lava sample comes from O'Leary Peak, a breached volcanic dome in Arizona's San Francisco Volcanic Field. It has a porphyritic texture, which refers to crystalline-textured igneous rocks having a mixture of large crystals (phenocrysts) and small crystals (groundmass). The light-colored, angular masses in the rock are feldspar phenocrysts. The feldspar is sanidine ((K,Na)AlSi3O8 - potassium sodium aluminosilicate). In some samples from this locality, the sanidine is rimmed with oligoclase feldspar ((Na,Ca)Al(Si,Al)Si2O8 - sodium calcium aluminosilicate). Other phenocrysts from this rock unit include quartz and oligoclase feldspar. Geologic unit: apparently derived from the "Purple Porphyry" of the O'Leary Porphyry, upper Middle Pleistocene, ~233 ka Locality: unrecorded/undisclosed site on O'Leary Peak, just north of Sunset Crater National Monument, ~26.5 air-kilometers north-northeast of Flagstaff, San Francisco Volcanic Field, north-central Arizona, USA (vicinity of 35° 24' 04.98" North latitude, 111° 31' 40.18" West longitude) |
Date | |
Source | Porphyritic rhyodacite (O'Leary Porphyry, Middle Pleistocene; O'Leary Peak, Arizona, USA) |
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@N05/27745649518 (archive). It was reviewed on 24 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
24 November 2019
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current | 10:49, 24 November 2019 | ![]() | 2,752 × 1,315 (3.12 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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ISO speed rating | 200 |
Date and time of data generation | 13:01, 24 March 2018 |
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Image title | |
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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 | 00:15, 22 April 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:01, 24 March 2018 |
Meaning of each component |
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Focal plane resolution unit | inches |
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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 | 20:15, 21 April 2018 |
Unique ID of original document | 8E77EA962DA1353D504D897B3748872A |
IIM version | 18,755 |