File:Carbonaceous chondrite (Allende Meteorite) (4.560-4.568 Ga) 10.jpg
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Summary[edit]
DescriptionCarbonaceous chondrite (Allende Meteorite) (4.560-4.568 Ga) 10.jpg |
English: Carbonaceous chondrite - slice of the Allende Meteorite from Mexico.
Carbonaceous chondrites are dark gray to blackish-colored chondrite meteorites with a relatively carbon-rich matrix. The first large sampling of carbonaceous chondrites available to meteoriticists came with the 1969 fall of the Allende Meteorite. Before Allende, carbonaceous chondrite material was exceedingly rare. Allende has become the most heavily studied and the most famous carbonaceous chondrite. Allende impacted on Earth at 1:05 AM on 8 February 1969. Its known strewn field trends southwest-to-northeast in the vicinity of the town of Allende in southeastern Chihuahua State, northern Mexico. The cut slice seen here displays the internal structure & composition of the Allende carbonaceous chondrite. Allende has small, spherical to subspherical structures called chondrules (all chondrites have these). Allende also contains whitish, irregularly-shaped patches called CAIs (“calcium-aluminum inclusions”), composed of high-temperature Ca-Al-Ti silicate and oxide minerals. The blackish, fine-grained, carbon-rich matrix consists of Fe-olivine and poorly graphitized carbon. A few tiny specks of metallic iron-nickel alloy also occur. Allende rocks represent the near-oldest meteoritic material known. The olivine chondrules in Allende rocks date to 4.560 billion years. The CAIs in Allende rocks date to 4.568 billion years. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50887737688/ |
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@N05/50887737688. It was reviewed on 2 February 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 February 2021
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current | 16:33, 2 February 2021 | 2,712 × 1,509 (5.42 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50887737688/ with UploadWizard |
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Camera manufacturer | Canon |
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Exposure time | 1/200 sec (0.005) |
F-number | f/3.5 |
ISO speed rating | 80 |
Date and time of data generation | 16:55, 28 January 2021 |
Lens focal length | 9.681 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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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 | 14:18, 29 January 2021 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 16:55, 28 January 2021 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 7.65625 |
APEX aperture | 3.625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.625 APEX (f/3.51) |
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Flash | Flash did not fire, compulsory flash suppression |
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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 | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 09:18, 29 January 2021 |
Unique ID of original document | AD5D071AB036CE6BF25BFD02701DBAF4 |