File:Garnet_lherzolite_-_xenolith_from_a_kimberlite_pipe,_Kimberley_SA.jpg
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Summary
DescriptionGarnet lherzolite - xenolith from a kimberlite pipe, Kimberley SA.jpg |
Garnet lherzolite (field of view ~1.6 cm across). Purplish red = pyrope garnet Bright green = chromian diopside pyroxene Dark green crystals = olivine & orthopyroxene One of the most incredibly rare rocks in my collection is this garnet lherzolite from South Africa. This is a slice of a xenolith nodule (“xeno” = foreign, and “lith” = rock) from a kimberlite pipe in Kimberley, central South Africa. As magma rises in a pipe during kimberlite formation, it plucks rock from the deep walls of the pipe. Many kimberlite xenoliths turn out to be samples from the deep crust, lithospheric mantle, and even possibly sub-lithospheric mantle. This garnet lherzolite xenolith is such a sample of lithospheric or sub-lithospheric mantle! Rocks such as garnet lherzolite and spinel lherzolite have traditionally been inferred to be primitive mantle materials. This rock is a variety of peridotite, an ultramafic intrusive igneous rock. It is dominated by two dark-greenish minerals: forsterite olivine (having veinlets of serpentine) and enstatite orthopyroxene. Notice that the rock also contains rounded, purplish-red crystals. These are pyrope garnets. There are also widely scattered, bright emerald green colored crystals of chromian diopside pyroxene. Small amounts of accessory minerals are also present. Age: Precambrian, very likely Archean (probably late Mesoarchean or early Neoarchean). |
Date | |
Source | Garnet lherzolite - xenolith from a kimberlite pipe (Precambrian, likely Archean; Kimberley, central South Africa) 2 |
Author | James St. John |
Other versions | Entire slab: [1] |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14817700428. It was reviewed on 24 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
24 August 2014
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:11, 24 August 2014 | 1,485 × 1,142 (1.87 MB) | Tillman | Transferred from Flickr via Flickr2commons |
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Pixel composition | RGB |
---|---|
Orientation | Normal |
Horizontal resolution | 2,400 dpi |
Vertical resolution | 2,400 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 21:33, 22 August 2014 |
Color space | Uncalibrated |
Image width | 1,485 px |
Image height | 1,142 px |
Date and time of digitizing | 17:32, 22 August 2014 |
Date metadata was last modified | 17:33, 22 August 2014 |