File:Kimberlite (Koidu Kimberlite Complex, Jurassic; Yengema-Koidu area, Sierra Leone, West Africa) 2.jpg
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Summary
[edit]DescriptionKimberlite (Koidu Kimberlite Complex, Jurassic; Yengema-Koidu area, Sierra Leone, West Africa) 2.jpg |
English: Kimberlite from the Jurassic of Sierra Leone, Africa. (~6.1 centimeters across at its widest)
Kimberlites and lamproites have significant economic importance because they are host rocks for gem-grade and industrial-grade diamonds. Kimberlites and 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. They are known from scattered localities throughout the world - only some are significantly diamondiferous. Classic localities for diamonds are India and Brazil. Africa was later 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, where several kimberlite pipes occur. Kimberlites have a gently tapering-downward, pipe-shaped cross-section. The slightly bluish-green kimberlite sample seen here is from the diamondiferous Koidu Kimberlite Complex of Jurassic age in eastern Sierra Leone, West Africa. The rounded, whitish- to pale green-colored grains are serpentinized olivine crystals having a mesh texture (reticulate texture) (click on the photo once or twice to zoom in). The sample is probably from one of the kimberlite dikes in the area (Dike Zone B, C, or D of Tompkins & Haggerty, 1984). Location: probably derived from the Yengema-Koidu (Sefadu) area, eastern Sierra Leone, West Africa Info. mostly synthesized from: Linda Tompkins (pers. comm.) Stuart McRae (pers. comm.) Tompkins & Haggerty (1984) - Kimberlites I: kimberlites and related rocks. in: Proceedings of the “Third International Kimberlite Conference”, volume 1. Developments in Petrology 11A. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/51419850037/ |
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@N05/51419850037. It was reviewed on 7 September 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 September 2021
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:07, 7 September 2021 | 2,799 × 2,375 (4.81 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51419850037/ with UploadWizard |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 18:57, 2 September 2021 |
Lens focal length | 9.681 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 22:26, 2 September 2021 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 18:57, 2 September 2021 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.65625 |
APEX exposure bias | −1 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 18:26, 2 September 2021 |
Unique ID of original document | 00EB9EF1172AA4C2FFD4ECA14F6FFFBC |
IIM version | 24,576 |