File:Zirkel Mesa WY Leucite Hills.jpg
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Summary
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| Description |
English: Zirkel Mesa - eroded wyomingite cinder cones in the Pleistocene of Wyoming, USA. (looking southwest from near Black Rock)
Southwestern Wyoming's Leucite Hills are a group of Pliocene to Pleistocene volcanic centers that erupted lamproite lavas, a rare extrusive igneous lithology. Based on chemistry and mineral content, the Leucite Hills lamproite lavas have been categorized as wyomingite, orendite, or madupite. Volcanism in this area may possibly be due to Yellowstone Hotspot fringe melting of the mantle. The lamproites appear to be derived from lherzolite-harzburgite mantle rocks that were metasomatically enriched in phlogopitic veins at >1.2 Ga (the latter may be caused by Precambrian subduction along the Wyoming Craton margin). The hills shown above are the six eroded wyomingite cinder cones that make up Zirkel Mesa. Quarrying of pumiceous wyomingite formerly took place at Zirkel Mesa. Age: Lower Pleistocene (sensu traditio), 950-960 ka |
| Date | |
| Source | https://www.flickr.com/photos/jsjgeology/21236490295/ |
| Author | James St. John |
| Object location |  | View this and other nearby images on: OpenStreetMap |  |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/21236490295. It was reviewed on 21 May 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:43, 21 May 2016 | | 3,200 × 782 (918 KB) | Gretarsson (talk | contribs) | and cropped (as originally uploaded) |
| 20:39, 21 May 2016 |  | 4,000 × 1,706 (2.49 MB) | Elisfkc (talk | contribs) | Full sized image from Flickr | |
| 23:56, 20 May 2016 |  | 3,200 × 782 (918 KB) | Gretarsson (talk | contribs) | {{Information |Description ={{en|1=Zirkel Mesa - eroded wyomingite cinder cones in the Pleistocene of Wyoming, USA. (looking southwest from near Black Rock) Southwestern Wyoming's Leucite Hills are a group of Pliocene to Pleistocene volcanic cente... |
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