File:Gilsonite (uintaite) (asphaltite) (Cottonwood Dike, Willow Creek System, probably Miocene to Oligocene, about 10-30 Ma; mine SSE of Ouray, south-central Uintah County, northeastern Utah, USA).jpg
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Summary
[edit]DescriptionGilsonite (uintaite) (asphaltite) (Cottonwood Dike, Willow Creek System, probably Miocene to Oligocene, about 10-30 Ma; mine SSE of Ouray, south-central Uintah County, northeastern Utah, USA).jpg |
English: Gilsonite (uintaite) from the Tertiary of northeastern Utah, USA. (~4.3 centimeters across)
Gilsonite (a.k.a. uintaite) is a variety of asphaltite - it's a solid hydrocarbon - basically solidified oil. Gilsonite usually has the appearance of obsidian or anthracite coal. It is jet black in color, very lightweight, brittle, and has a conchoidal fracture. The largest “deposits” of gilsonite in the world are in the Uinta Basin of northeastern Utah, USA. Gilsonite occurs there as vertical NW-SE trending veins intruded within the Eocene-aged Uinta Formation. The source of the hydrocarbons is organic-rich beds in the underlying Green River Formation (Eocene) and Wasatch Formation (Paleocene). The sample shown above is a from a gilsonite mine developed on the Cottonwood Dike (Cottonwood Vein), a N60-64W striking, 13 to 16 km long, 0.6 to 0.9 meter wide, vertical to subvertical gilsonite dike in the Willow Creek System. The dike was probably emplaced ~10 to 30 million years ago. The Cottonwood Dike is mined south-southeast of Ouray, Utah. Gilsonite material from Utah does not always have an obsidian-like appearance The sample shown here differs from typical gilsonite. This is pencillated gilsonite, characterized by having abundant parallel fractures. When viewed from the side, this material has a splintery appearance (from certain angles, it looks like hornblende schist). The only pencillated gilsonite material I've seen also has abundant fracture circlets (conchoidal fracture). Gilsonite is not readily combustible and is not a fuel, but it does have economic value. Gilsonite is mined in northeastern Utah and processed and is used in numerous products and applications (e.g., see: www.geospectra.net/kite/gilsonite/gilson.htm). Approximate composition: 85% carbon, 10% hydrogen, 2.5% nitrogen, 1.5% oxygen, 0.3% sulfur, 0.2% silicon, nickel & trace elements. Locality: gilsonite mine south-southeast of Ouray, south-central Uintah County, northeastern Utah, USA (section 35, T10S, R21E, Big Pack Mountain NE 7.5’ USGS topographic quadrangle) |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/15111443685/ |
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@N05/15111443685. It was reviewed on 18 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
18 October 2020
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current | 02:42, 18 October 2020 | 3,008 × 2,000 (2.48 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/15111443685/ with UploadWizard |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 18:54, 1 September 2014 |
Color space | Uncalibrated |
Image width | 3,008 px |
Image height | 2,000 px |
Date and time of digitizing | 15:29, 29 September 2007 |
Date metadata was last modified | 14:54, 1 September 2014 |
IIM version | 2 |