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- Lars E. Borg
- SN2/NASA Johnson Space Center Houston, TX 77058, USA.
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- James N. Connelly
- Department of Geological Sciences, University of Texas at Austin, TX 78713, USA.
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- Larry E. Nyquist
- SN2/NASA Johnson Space Center Houston, TX 77058, USA.
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- Chi-Y. Shih
- Lockheed Engineering and Science, 2400 NASA Road 1, Houston, TX 77258, USA.
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- Young Reese
- Lockheed Engineering and Science, 2400 NASA Road 1, Houston, TX 77258, USA.
書誌事項
- 公開日
- 1999-10
- DOI
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- 10.1126/science.286.5437.90
- 公開者
- American Association for the Advancement of Science (AAAS)
この論文をさがす
説明
<jats:p>The age of secondary carbonate mineralization in the martian meteorite ALH84001 was determined to be 3.90 ± 0.04 billion years by rubidium-strontium (Rb-Sr) dating and 4.04 ± 0.10 billion years by lead-lead (Pb-Pb) dating. The Rb-Sr and Pb-Pb isochrons are defined by leachates of a mixture of high-graded carbonate (visually estimated as ∼5 percent), whitlockite (trace), and orthopyroxene (∼95 percent). The carbonate formation age is contemporaneous with a period in martian history when the surface is thought to have had flowing water, but also was undergoing heavy bombardment by meteorites. Therefore, this age does not distinguish between aqueous and impact origins for the carbonates.</jats:p>
収録刊行物
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- Science
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Science 286 (5437), 90-94, 1999-10
American Association for the Advancement of Science (AAAS)
