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Discovery of 17,18 O-rich material from meteorite by direct-imaging method using stigmatic-SIMS and 2D ion detector

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Title: Discovery of 17,18 O-rich material from meteorite by direct-imaging method using stigmatic-SIMS and 2D ion detector
Authors: Sakamoto, Naoya Browse this author
Itoh, Shoichi Browse this author
Yurimoto, Hisayoshi Browse this author
Keywords: Direct-imaging
Ion detector
Oxygen isotope
Solar System
Issue Date: 15-Dec-2008
Publisher: Elsevier B.V.
Journal Title: Applied Surface Science
Volume: 255
Issue: 4
Start Page: 1458
End Page: 1460
Publisher DOI: 10.1016/j.apsusc.2008.05.052
Abstract: We report a discovery of a chemically and isotopically unique material distributed ubiquitously in fine-grained matrix of a primitive carbonaceous chondrite Acfer 094. The observations were made in situ using a novel high precision imaging technique adopted direct-imaging method. The material is extremely enriched in heavy oxygen isotopes of O-17 and O-18 of +18% relative to the Earth's ocean while previously reported variation of oxygen isotopes is as large as a range from -8% to 0%. Based on the unique chemical composition of the material, the abundance of the material in the meteorite matrix is calculated to be 94 ± 20 (σ) ppm by volume using elemental mapping with a 7 μm2 spatial resolution by FE-SEM-EDS on the meteorite thin section. The average size of identified materials is 5 x 5 x 5 μm3. Therefore, isotope imaging capability over 500 x 500 μm2 area with micron resolution and an isotopic ratio precision of 1 percent is required to investigate about the presence of such material.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 圦本 尚義

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