SNC meteorites: Evidence against an asteroidal origin
| Autor: | Lewis D. Ashwal, Jeffrey L. Warner, Charles A. Wood |
|---|---|
| Rok vydání: | 1982 |
| Předmět: |
Martian
Atmospheric Science Ecology Paleontology Soil Science Cumulate rock Forestry Aquatic Science Oceanography Parent body Astrobiology Igneous rock Geophysics Meteorite Impact crater Space and Planetary Science Geochemistry and Petrology Asteroid Martian surface Earth and Planetary Sciences (miscellaneous) Geology Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research. 87:A393 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/jb087is01p0a393 |
| Popis: | About 1.3 billion years ago, on one or more distant planetary bodies, silicate melts formed and produced cumulate rocks which eventually made their way to earth. Nine of these rocks have been recovered. Three distinct groups are involved, including shergottites, nakhlites, and chassignites (abbreviated as SNC). The young crystallization ages and other chemical features of SNC meteorites have prompted several workers to suggest that the specimens may be samples of igneous rock, ejected from the surface of Mars during an impact event. Others have rejected the Martian origin of SNC meteorites in favor of a more traditional asteroidal parent body. The present investigation shows that the petrologic, geochemical, and isotopic evidence is inconsistent with an asteroidal origin for SNC meteorites. It is found that the characteristics of SNC meteorites argue convincingly against their origin in a planetary object as small as the largest asteroid. That these meteorites may be fragments of the Martian surface still remains the most likely possibility. |
| Databáze: | OpenAIRE |
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