File:Gilsonite (uintaite) (Big Bonanza Vein intruded in the Uinta Formation, Middle Eocene; Bonanza, Utah, USA) 4.jpg

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Captions

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Gilsonite

Summary

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Description
English: Gilsonite from the Tertiary of Utah, USA. (~7.4 centimetres (2.9 in) across at its widest)

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).

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).

Seen here is a gilsonite sample from the Big Bonanza Vein (also known as the Independent Dike or the Independent Vein; other names for the same dike include East Bonanza Vein and Bonanza Vein; the latter designation has been applied to more than 1 gilsonite vein in the area). The dike ranges from about 5 to 14 feet wide and averages over 10 feet wide over a 3 mile stretch. It intrudes the Uinta Formation and was probably emplaced ~10 to 30 million years ago.

Locality: unrecorded/undisclosed locality along the Big Bonanza Vein (Independent Dike), near the town of Bonanza, eastern Uintah County, northeastern Utah, USA
Date
Source https://www.flickr.com/photos/47445767@N05/49035142238/
Author James St. John

Licensing

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49035142238. 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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current02:42, 18 October 2020Thumbnail for version as of 02:42, 18 October 20202,755 × 2,133 (3.46 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49035142238/ with UploadWizard

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