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报告编号N20050169505
Ar-Ar Ages of Nakhlite Y000593, NWA998, and Nakhla and Cre Age of Nwa998.
Garrison, D. H; Bogard, D. D.
英文摘要The seven known Martian nakhlites are Nakhla, Lafayette, Governador Valadares, and four recent finds from hot and cold deserts: MIL03346 from the Transantarctic Mountains, a paired group from the Yamato Mountains (Y000593, Y000749, and Y000802), and two from Morocco (NWA998 and NWA817). Radiometric ages (Sm- Nd, Rb-Sr, U-Pb, and Ar-Ar) for the first three nakhlites, along with Chassigny, fall in the range of 1.19-1.37 Gyr and may suggest a common formation age. These meteorites also show very similar cosmic-ray (space) exposure ages, suggesting a single ejection event from Mars. The ages for nakhlites are different from those of Martian shergottites, whose radiometric ages vary by nearly a factor of three (approx. 165-475 Myr) and whose space exposure ages vary over a factor of approx. 20. Shergottite ages suggest that multiple locations on the Martian surface have been sampled, whereas nakhlite data imply sampling of only one Mars surface location.
英文关键词Nakhlites Mars surface Meteorites Cosmic rays Exposure Age Radiometers Shergottites Rocks Chemical composition
出版年2005
语种英语
国家United States
URLhttp://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=59fb374131c97d1d54a08292
来源机构National Aeronautics and Space Administration
资源类型科技报告
条目标识符http://119.78.100.177/qdio/handle/2XILL650/273420
推荐引用方式
GB/T 7714		 Garrison, D. H,Bogard, D. D.. Ar-Ar Ages of Nakhlite Y000593, NWA998, and Nakhla and Cre Age of Nwa998.,2005.
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