File:Garnet-pyroxene-molybdenite-scheelite skarn (Late Cretaceous, 92 Ma; Reilly Mine, eastern side of Osgood Mountains, northern Nevada) 1 (15065590531).jpg
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[edit]DescriptionGarnet-pyroxene-molybdenite-scheelite skarn (Late Cretaceous, 92 Ma; Reilly Mine, eastern side of Osgood Mountains, northern Nevada) 1 (15065590531).jpg |
Skarn from the Cretaceous of Nevada, USA. (field of view ~2.0 cm across) Skarn is a contact metamorphic rock with a crystalline texture. It forms by heating and addition of elements (metasomatism) to country rock in the immediate vicinity of an igneous intrusion (batholith, stock, sill, dike, laccolith). Carbonate rock skarn is frequently called tactite. The rock shown above is an andradite-diopside skarn from Nevada having reddish-brown andradite garnets (ideally Ca3Fe2Si3O12), dark greenish diopside (a Ca-Mg pyroxene), silver-colored molybdenite (molybdenum sulfide - MoS2), a little quartz (silicon dioxide - SiO2), and a little scheelite (calcium tungstate - CaWO4). The molybdenite content is high enough for this rock to qualify as a molybdenum ore. Geology - contact metamorphosed limestones of the Comus Formation (Upper Cambrian-Lower Ordovician) against the Osgood Mountain Stock, an early Late Cretaceous (92 Ma) granodiorite intrusion. The garnet-rich skarn zone around the Osgood Mountain Stock is moderately rich in tungsten (W) and occasional molybdenum (Mo). Locality - Reilly Mine (section 9, T38N, R42E), Potosi District, eastern side of the Osgood Mountains (Osgood Range), eastern Humboldt County, northern Nevada, USA (= approximately 41° 11’ 21” North, 117° 15’ 03” West) |
Date | |
Source | Garnet-pyroxene-molybdenite-scheelite skarn (Late Cretaceous, 92 Ma; Reilly Mine, eastern side of Osgood Mountains, northern Nevada) 1 |
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@N05/15065590531 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
1 December 2019
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current | 09:06, 1 December 2019 | 3,008 × 2,000 (3.12 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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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 | 16:51, 10 February 2007 |
Color space | Uncalibrated |
Image width | 3,008 px |
Image height | 2,000 px |
Date and time of digitizing | 11:51, 10 February 2007 |
Date metadata was last modified | 11:51, 10 February 2007 |