File:Wyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 27.jpg
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editDescriptionWyomingite (Lower Pleistocene, 0.95 Ma; quarry on volcanic cone on Zirkel Mesa, Leucite Hills Volcanic Province, Wyoming, USA) 27.jpg |
English: Wyomingite from the Pleistocene of Wyoming, USA.
The Leucite Hills Volcanic Province of southwestern Wyoming contains some of the rarest rocks on Earth. Each volcanic center in the Leucite Hills erupted lamproite lava. Lamproite is a rare, ultrapotassic & ultramafic igneous rock. It usually occurs in diatremes (= pipe-shaped igneous intrusions). Occasionally, gem-quality diamonds occur in lamproite diatremes. Various cinder cone volcanoes in the Leucite Hills erupted four types of lamproite lavas: wyomingite, orendite, olivine orendite, and madupite. Wyomingite is the most common Leucite Hills lamproite lithology - it is also the "official state rock" of Wyoming. Wyomingite is an attractive rock, having numerous golden-brown phenocrysts of phlogopite mica. Other minerals in wyomingite rocks include leucite, diopside pyroxene, fluorapatite, and katophorite. Locality: abandoned small quarry on the southern side of a cinder cone volcano on Zirkel Mesa, Leucite Hills Volcanic Province, northeast of the town of Superior, southwestern Wyoming, USA Example references on Leucite Hills geology: Lange, R.A., I.S.E. Carmichael & C.M. Hall. 2000. 40Ar/39Ar chronology of the Leucite Hills, Wyoming: eruption rates, erosion rates, and an evolving temperature structure of the underlying mantle. Earth and Planetary Science Letters 174: 329-340. Schultz, A.R. & W. Cross. 1912. Potash-bearing rocks of the Leucite Hills, Sweetwater County, Wyoming. United States Geological Survey Bulletin 512. 39 pp. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/49992553011/ |
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@N05/49992553011. It was reviewed on 2 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 November 2020
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current | 17:03, 2 November 2020 | 3,509 × 2,280 (7.44 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49992553011/ with UploadWizard |
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F-number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 21:39, 9 June 2020 |
Lens focal length | 9.681 mm |
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Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 13:57, 10 June 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 21:39, 9 June 2020 |
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Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 09:57, 10 June 2020 |
Unique ID of original document | 3D1330C41D9A14888B3A1DC27002CF2E |