File:Carbonaceous chondrite (Allende Meteorite) (4.560-4.568 Ga) 5 (16763229093).jpg
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editDescriptionCarbonaceous chondrite (Allende Meteorite) (4.560-4.568 Ga) 5 (16763229093).jpg |
Carbonaceous chondrite - large slice (549 grams) of the Allende Meteorite. (Maine Mineral & Gem Museum collection, Bethel, Maine, USA) 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 slice shown above 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 silicates & oxides. The blackish, fine-grained, carbon-rich matrix consists of Fe-olivine & 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 | Carbonaceous chondrite (Allende Meteorite) (4.560-4.568 Ga) 5 |
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@N05/16763229093. It was reviewed on 3 December 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
3 December 2015
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current | 20:10, 3 December 2015 | 3,548 × 2,603 (3.38 MB) | Basilicofresco (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Horizontal resolution | 180 dpi |
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File change date and time | 00:20, 5 May 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 10:29, 2 May 2015 |
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Scene capture type | Portrait |
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Date metadata was last modified | 20:20, 4 May 2015 |
Unique ID of original document | B9E6E4A8B8F2C0FBC91B4659A4A8408F |
IIM version | 24,576 |