File:Kimberlite (Chicken Park Kimberlite Pipe, Neoproterozoic, 614 Ma; near Red Feather Lakes, State Line Kimberlite Field, Larimer County, northern Colorado, USA) 1 (14821437844).jpg
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Summary
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| Description |
Chicken Park Kimberlite from the Precambrian of Colorado, USA (3.0 cm across). Kimberlites and lamproites have tremendous economic importance because they are host rocks for gem-grade and industrial-grade diamonds. Kimberlites & lamproites are unusual igneous bodies having overall pipe-shaped geometries. Their mode of formation is only moderately understood because they have not been observed forming. Kimberlites & lamproites are known from scattered localities throughout the world - only some are significantly diamondiferous. Classic localities for diamonds are India and Brazil. Africa was also discovered to have many kimberlites and is world-famous for producing large numbers of diamonds. Other notable diamondiferous kimberlite-lamproite occurrences include Russia, China, northwestern Australia, and northwestern Canada. Kimberlites are named for the town of Kimberley, South Africa. Several kimberlite pipes occur in the Kimberley area. Kimberlites have a gently tapering-downward, pipe-shaped cross-section. Lamproites have a cross-section more closely resembling that of a martini glass. A decent number of kimberlite bodies have been identified in the Rocky Mountains along the Colorado-Wyoming border. The rock shown above is a small kimberlite sample from the diamondiferous Chicken Park Pipe near Red Feather Lakes in northern Larimer County, northern Colorado, USA. The Chicken Park Kimberlite Pipe is part of the State Line Kimberlite Field, traditionally considered to represent many kimberlite bodies emplaced at about the same time. Recent isotopic dating has indicated this is not the case. The Chicken Park Pipe is late Neoproterozoic in age (614 million years). |
| Date | |
| Source | Kimberlite (Chicken Park Kimberlite Pipe, Neoproterozoic, 614 Ma; near Red Feather Lakes, State Line Kimberlite Field, Larimer County, northern Colorado, USA) 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@N05/14821437844 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 02:11, 6 December 2019 | | 1,504 × 1,276 (394 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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