File:Chromitite (Great Dike of Rhodesia, Neoarchean, 2.57-2.58 Ga; Caesar Mine, Mvurwi Range, northern Zimbabwe, southern Africa) (14979752736).jpg
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Summary
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Chromitite with serpentine from the Precambrian of Zimbabwe. (6.5 centimeters across at its widest) LLIs are large layered igneous intrusions. Famous examples include Montana’s Stillwater Complex, South Africa’s Bushveld Complex, the Muskox in Canada, the Dufek in Antarctica, Greenland's Skaergaard Complex, and southern Africa’s Great Dike of Rhodesia. LLIs consist of thick successions of ultramafic intrusive igneous rocks displaying small-scale to large-scale layering. The layering in LLIs is the result of crystal settling during cooling of the original magma. Repeated injections of magma is thought to be necessary in order to get layering throughout the extremely thick sections of rock. LLIs typically have economic concentrations of important metals (e.g., chromium, platinum). The rock shown here is a chromium ore from the 2.57-2.58 billion year old Great Dike of Rhodesia. Many mines exploit the Great Dike - this sample is from the Caesar Mine in the northern part of Southern Rhodesia (= Zimbabwe). The black component is the mineral chromite (FeCr2O4). The whitish portions are serpentine (Mg3Si2O5(OH)4), which is metamorphosed olivine. Chromite-dominated, crystalline-textured, intrusive igneous rocks are called chromitites. Locality: unrecorded chromitite seam & unrecorded level in the Caesar Mine, ~12 km south of Mutorashanga Pass, Mvurwi Range, Makonde District, Mashonaland West Province, northern part of Southern Rhodesia/Zimbabwe, southern Africa |
| Date | |
| Source | Chromitite (Great Dike of Rhodesia, Neoarchean, 2.57-2.58 Ga; Caesar Mine, Mvurwi Range, northern Zimbabwe, southern Africa) |
| 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@N05/14979752736 (archive). It was reviewed on 5 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 | |
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| current | 05:44, 5 December 2019 | | 1,053 × 755 (1.32 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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