File:Impala Black Granite (gabbronorite) Bushveld Complex.jpg
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[edit]DescriptionImpala Black Granite (gabbronorite) Bushveld Complex.jpg |
Impala Black Granite - an attractive, 2 billion year old gabbronorite from South Africa. It is composed principally of grayish plagioclase feldspar and black pyroxene. It comes from the famous Bushveld Complex, a world-class example of an LLI (large layered igneous province). LLIs often have economic concentrations of valuable metals, such as platinum and chromium. North America has one economically significant LLI - the Stillwater Complex of Montana. The Bushveld has a thick stratigraphy that is well documented. The gabbronorite sample shown here comes from the upper Main Zone of the Rustenburg Layered Suite. It dates to the mid-Paleoproterozoic (2054-2061 million years). “Impala Black Granite” is quarried north of the town of Rustenburg in northeastern North West Province (= northwest of the city of Johannesburg), South Africa. |
Date | |
Source | Impala Black Granite (gabbronorite, Bushveld Complex, 2.054-2.061 Ga, Paleoproterozoic; north of Rustenburg, North West Province, South Africa) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14620359649. It was reviewed on 4 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
4 August 2014
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current | 03:47, 4 August 2014 | 1,061 × 930 (2.27 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Vertical resolution | 400 dpi |