File:Kimberlite (Lake Ellen Kimberlite Pipe, Early Jurassic, ~180 Ma; Lake Ellen area, Upper Peninsula of Michigan, USA) (14823615605).jpg
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Lake Ellen Kimberlite from the Lake Ellen area, Upper Peninsula of Michigan, USA (field of view ~7.2 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. The rock shown above is from a well-known microdiamondiferous kimberlite body at Lake Ellen in Michigan’s Upper Peninsula, called the Lake Ellen Kimberlite Pipe. Reported large fragments and xenoliths in Lake Ellen Kimberlite rocks include ilmenite, pyroxene, garnet, olivine, phlogopite, eclogite, pyroxenite, phyllite, amphibolite, gabbro, granulite, and dolostone. Age: Early Jurassic, ~180 million years. Location: hill between Michigamme Reservoir and Lake Ellen-Little Lake Ellen (approximately N1/2, N1/2, NW1/4, Section 34, Kiernan 7.5’ USGS topographic quadrangle), far-eastern Iron County, western UP of Michigan, USA (~46° 10’ 27” North, 88° 10’ 30” West). |
| Date | |
| Source | Kimberlite (Lake Ellen Kimberlite Pipe, Early Jurassic, ~180 Ma; Lake Ellen area, Upper Peninsula of Michigan, USA) |
| 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@N05/14823615605 (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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:56, 6 December 2019 | | 1,120 × 770 (1.29 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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