File:Pahoehoe lava (Blue Dragon Flow, Holocene, 2.030-2.076 ka; Craters of the Moon Lava Field, Idaho, USA) 16.jpg
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English: Pahoehoe lava in the Holocene of Idaho, USA.
Southern Idaho’s Snake River Plain represents the track of the Yellowstone Hotspot. Yellowstone is currently located in northwestern Wyoming. In the geologic past, the center of Yellowstone volcanism was in southern Idaho, and before that, it was located in southeastern Oregon. Eight large, distinctive, dark-colored lava fields cover portions of the modern Snake River Plain: Shoshone Lava Field, Craters of the Moon Lava Field, Wapi Lava Field, Kings Bowl Lava Field, Cerro Grande Lava Field, North Robbers Lava Field, South Robbers Lava Field, and Hell’s Half Acre Lava Field. These lavas erupted during the late Pleistocene and Holocene, well after the Yellowstone Hotspot “migrated” to the northeast. The lavas are so young that little vegetation covers them. Portions of the Snake River Plain's basaltic lava fields have been designated as Craters of the Moon National Monument. The flows & cones in the Craters of the Moon Lava Field range in age from ~15 ka to ~2 ka. The landscape is harshly beautiful and provides an excellent opportunity to closely examine terrestrial basalt volcanism. Seen here is a portion of the Blue Dragon Flow, which erupted from Big Craters, a cinder cone complex ~between Inferno Cone and North Crater Cinder Cone. A little over 2,000 years ago, Big Craters erupted basalt and hawaiite lava, which spread out, cooled, and solidified. Hawaiite is an alkaline variety of basalt. Lava flow top morphologies range from aa to pahoehoe - these terms are Hawaiian in origin. Aa lava has irregular, sharp-pointed, angular flow tops. Pahoehoe lava (pronounced "pa-hoy-hoy") has smooth or ropy flow tops. Stratigraphy: Blue Dragon Flow, Craters of the Moon Lava Field, upper Holocene, 2.030-2.076 ka Locality: trailside, Caves Trail (between trailhead and Dewdrop Cave), Craters of the Moon National Monument, northern Snake River Plain, southern Idaho, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/49474630177/ |
| 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@N05/49474630177 (archive). It was reviewed on 3 February 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 19:39, 3 February 2020 | | 3,008 × 2,000 (4.41 MB) | Ser Amantio di Nicolao (talk | contribs) | User created page with UploadWizard |
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