File:Angrite (NWA 2999 Meteorite) (4.558-4.562 Ga) 2.jpg
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[edit]DescriptionAngrite (NWA 2999 Meteorite) (4.558-4.562 Ga) 2.jpg |
English: Angrite (NWA 2999 Meteorite) (cut slice, 2.4 centimeters across)
Angrites are a rare group of achondrite meteorites (= meteorites lacking rounded structures called chondrules) with a distinctive chemistry and mineralogy. This is a slice from an angrite discovered in 2004, the NWA 2999 Meteorite (NWA = "Northwest Africa"). It is reportedly paired with the NWA 3164, NWA 4662, and NWA 4931 Meteorites. The rock is a very dark brown peridotite (ultramafite). "Peridotite" is an igneous-sounding name, and it is ultimately plutonic in origin, but is has been altered and metamorphosed since it originally crystallized from melt. Available mineral analysis data has indicated that the NWA 2999 angrite contains ~65% olivine, ~23% clinopyroxene, ~8% metallic iron, ~4% spinel, ~1% anorthite (calcium plagioclase feldspar), plus trace amounts of other minerals. Dates on some of the 30 known angrites are between 4.557 to 4.562 billion years. Published dates on the NWA 2999 angrite range from 4.558 to 4.562 billion years. Angrites have been interpreted as originating from the mantle of Planet Mercury. This idea was based on, for one thing, the lack of volatile elements in the rocks. The full reasoning behind angrites having a Mercurian origin is summarized in Irving et al. (2005) and Kuehner et al. (2006). Other meteorite researchers (e.g., Ruzicka & Hutson, 2006; R. Malcuit, pers. comm.) have not accepted the Mercurian provenance interpretation. Data from Planet Mercury that has been acquired by the MESSENGER spacecraft in 2011 & 2012 now show that angrites are not from Mercury (Irving et al., 2013). [Note: an olivine gabbro meteorite, designated Northwest Africa 7325, has recently been identified as being more consistent with the known geochemistry of Mercury rocks - see Irving et al., 2013] The lack of volatile elements in angrites does argue for an origin in proximity to the Sun, possibly in the vulcanoid belt. The term “vulcanoids” refers to the hypothetical existence of several bodies (how many?) that used to orbit the Sun closer than Mercury. They have left their original orbits by one or more planetary migration events. Additional info. on this particular meteorite can be found in Gellissen et al. (2007) and Humayun et al. (2007). Info. mostly synthesized from: Irving et al. (2005) - American Geophysical Union Fall Meeting Abstracts Kuehner et al. (2006) - 37th Lunar and Planetary Science Conference Abstracts Ruzicka & Hutson (2006) - 69th Annual Meteoritical Society Meeting Abstracts Gellissen et al. (2007) - 38th Lunar and Planetary Science Conference Abstracts Humayun et al. (2007) - 38th Lunar and Planetary Science Conference Abstracts Markowski et al. (2007) - Earth and Planetary Science Letters 262(1-2): 214-229. Amelin & Irving (2007) - Workship on Chronology of Meteorites abstract 4061. Shukolyukov & Lugmair (2008) - 39th Lunar and Planetary Science Conference Abstracts Adam Hupé (pers. comm.) |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/33347396978/ |
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@N05/33347396978. It was reviewed on 24 February 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
24 February 2023
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current | 17:51, 24 February 2023 | 1,924 × 1,048 (1.12 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/33347396978/ with UploadWizard |
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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 | 16:43, 26 February 2019 |
Lens focal length | 9.681 mm |
Image title | |
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 13.0 (Macintosh) |
File change date and time | 17:57, 26 February 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 16:43, 26 February 2019 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.65625 |
APEX exposure bias | −0.66666666666667 |
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 | 12:57, 26 February 2019 |
Unique ID of original document | 45331C57602A950CE2073183AD4EF0C4 |
IIM version | 24,640 |