Sandstones (Wasatch Formation, Paleocene to Lower Eocene; Black Rock, Leucite Hills, Wyoming, USA) 4 : 無料・フリー素材/写真
Sandstones (Wasatch Formation, Paleocene to Lower Eocene; Black Rock, Leucite Hills, Wyoming, USA) 4 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Sandstones in the Tertiary of Wyoming, USA.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).Seen here is a sandstone outcrop next to a Leucite Hills volcanic center called Black Rock, which is composed of olivine orendite lamproite.Stratigraphy: Wasatch Formation, Paleocene to lowermost EoceneLocality: northern flanks of Black Rock volcanic center, eastern Leucite Hills, Sweetwater County, southwestern Wyoming, USA |
| 撮影日 | 2012-06-06 13:38:42 |
| 撮影者 | James St. John |
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