File:Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 3 (48353940212).jpg
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[edit]DescriptionKimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 3 (48353940212).jpg |
Kimberlite in the Jurassic of Pennsylvania, USA. 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. They 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 that area. Kimberlites have a gently tapering-downward, pipe-shaped cross-section, somewhat like a carrot. Lamproites have a cross-section shape that resembles a martini glass. The rock seen here is part of a non-diamondiferous kimberlite intrusion in Pennsylvania. Unlike most kimberlites, which have pipe-shaped geometries, this occurrence is an igneous dike. The groundmass consist of olivine, phlogopite mica, and opaque minerals. Phenocrysts and megacrysts reported from this unit include olivine (serpentinized) and pyrope garnet. Geologic unit: Gates-Adah Kimberlite Dike, middle Early Jurassic, 185 Ma Locality: Gates-Adah Kimberlite Dike trend, near Middle Run, east of the Monongahela River, north or northeast of the town of Gates, far-western Fayette County, southwestern Pennsylvania, USA Info. at: <a href="https://www.mindat.org/loc-52104.html" rel="noreferrer nofollow">www.mindat.org/loc-52104.html</a> |
Date | |
Source | Kimberlite (Gates-Adah Kimberlite Dike, Early Jurassic; Fayette County, Pennsylvania, USA) 3 |
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@N05/48353940212 (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. |
6 December 2019
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current | 04:03, 6 December 2019 | 3,008 × 2,000 (5.5 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Exposure time | 1/160 sec (0.00625) |
F-number | f/8 |
ISO speed rating | 400 |
Date and time of data generation | 11:45, 19 March 2010 |
Lens focal length | 75 mm |
Width | 3,008 px |
Height | 2,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 00:35, 23 July 2019 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:45, 19 March 2010 |
Meaning of each component |
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Image compression mode | 4 |
APEX shutter speed | 7.321928 |
APEX aperture | 6 |
APEX exposure bias | 0 |
Maximum land aperture | 4.7 APEX (f/5.1) |
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Light source | Unknown |
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Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 112 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 200638ad |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 20:35, 22 July 2019 |
Unique ID of original document | 761135D0BA3B7ED14E9B82BAFCA30970 |