File:Allende Meteorite, Carbonaceous Chondrite (14787764392).jpg
Allende meteorite, 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) 2
Author
James St. John
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14787764392. It was reviewed on 15 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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