File:Alkaline olivine basalt (Kana'a Lava Flow, upper Holocene, erupted from Sunset Crater; San Francisco Volcanic Field, Arizona, USA) 5 (49129214252).jpg
![File:Alkaline olivine basalt (Kana'a Lava Flow, upper Holocene, erupted from Sunset Crater; San Francisco Volcanic Field, Arizona, USA) 5 (49129214252).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Alkaline_olivine_basalt_%28Kana%27a_Lava_Flow%2C_upper_Holocene%2C_erupted_from_Sunset_Crater%3B_San_Francisco_Volcanic_Field%2C_Arizona%2C_USA%29_5_%2849129214252%29.jpg/800px-Alkaline_olivine_basalt_%28Kana%27a_Lava_Flow%2C_upper_Holocene%2C_erupted_from_Sunset_Crater%3B_San_Francisco_Volcanic_Field%2C_Arizona%2C_USA%29_5_%2849129214252%29.jpg?20191127065248)
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[edit]DescriptionAlkaline olivine basalt (Kana'a Lava Flow, upper Holocene, erupted from Sunset Crater; San Francisco Volcanic Field, Arizona, USA) 5 (49129214252).jpg |
Alkaline olivine basalt in the Holocene of Arizona, USA. This is a basaltic lava flow erupted from the base of Sunset Crater, a cinder cone in Arizona's San Francisco Volcanic Field. Cinder cones are relatively small, steep-sided cones of loose igneous debris. They have few eruptions and a relatively large summit crater. Cinder cones are principally composed of scoria and vesicular basalt. More than 600 eruptive centers - mostly cinder cones - are present in the volcanic field, and date from the Late Miocene to the late Holocene. The largest volcano in the area is San Francisco Mountain, an eroded stratovolcano. Cinder cones in the field have erupted a variety of igneous products, ranging from mafic to felsic to alkaline in composition - most are alkaline basalt. Sunset Crater had an eruption in the late 11th century A.D., variously dated to 1064 or in the 1080s. The eruption involved lava flows and relatively widespread deposition of airfall scoria. This was the most recent activity in the entire San Francisco Volcanic Field. Seen here is the Kana'a Lava Flow, which extends about 10 kilometers to the east-northeast of Sunset Crater. Much of this flow unit is covered by airfall scoria. Locality: outcrop on the southern side of Forest Road 545, east of Sunset Crater, Coconino National Forest, San Francisco Volcanic Field, Coconino County, north-central Arizona, USA |
Date | |
Source | Alkaline olivine basalt (Kana'a Lava Flow, upper Holocene, erupted from Sunset Crater; San Francisco Volcanic Field, Arizona, USA) 5 |
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@N05/49129214252 (archive). It was reviewed on 27 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
27 November 2019
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current | 06:52, 27 November 2019 | ![]() | 3,008 × 2,000 (5.12 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Horizontal resolution | 300 dpi |
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File change date and time | 12:54, 26 November 2019 |
Y and C positioning | Co-sited |
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Exif version | 2.21 |
Date and time of digitizing | 13:29, 5 September 2007 |
Meaning of each component |
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File source | Digital still camera |
Scene type | A directly photographed image |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 36 mm |
Scene capture type | Landscape |
Scene control | Low gain up |
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Date metadata was last modified | 07:54, 26 November 2019 |
Unique ID of original document | 8BEBD80D1FE205EADC0672B1F72CBE42 |