Ancient Asteroids Enriched in Refractory Inclusions.
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| Title: | Ancient Asteroids Enriched in Refractory Inclusions. |
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| Authors: | Sunshine, J. M., ConnolLy Jr., H. C., McCoy, T. J., Bus, S. J., La Croix, L. M. |
| Source: | Science (pre-March 2025). 4/25/2008, Vol. 320 Issue 5875, p514-517. 4p. 1 Diagram, 1 Chart, 4 Graphs. |
| Subjects: | Metal inclusions, Calcium, Aluminum, Chondrites, Chondrules, Minerals, Iron oxides, Solar system, Infrared spectra, Spectrum analysis |
| Abstract: | Calcium- and aluminum-rich inclusions (CAIs) occur in all classes of chondritic meteorites and contain refractory minerals predicted to be the first condensates from the solar nebula. Near-infrared spectra of CAIs have strong 2-micrometer absorptions, attributed to iron oxide-bearing aluminous spinel. Similar absorptions are present in the telescopic spectra of several asteroids; modeling indicates that these contain -30 ± 100/0 CAIs (two to three times that of any meteorite). Survival of these undifferentiated, large (50- to 100-kilometer diameter) CAl-rich bodies suggests that they may have formed before the injection of radiogenic 26Al into the solar system. They have also experienced only modest post-accretionary alteration. Thus, these asteroids have higher concentrations of CAl material, appear less altered, and are more ancient than any known sample in our meteorite collection, making them prime candidates for sample return. [ABSTRACT FROM AUTHOR] |
| Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
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