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Merry Christmas& Happy New Year to everyone and see you in 2016 !

¹Jun-ichi Matsuda, ¹Kazuhiko Morishita, ²Masayuki Nara,³Sachiko Amari
¹Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan
²Laboratory of Chemistry, College of Liberal Arts and Sciences, Tokyo Medical and Dental University, Chiba, Japan
³McDonnell Center for the Space Sciences and the Physics Department, Washington University, St. Louis, Missouri, USA

We analyzed noble gases in an oxidized residue prepared from a HF-HCl residue of the Saratov L4 chondrite. The Ar, Kr, and Xe concentrations in the oxidized residue are two orders of magnitude lower than those in the HF-HCl residue, and they are close to concentrations in the bulk. The He and Ne concentrations are similar in the three samples. The Ne isotopic ratios are almost purely cosmogenic, indicating absence of presolar diamonds (the carrier of the HL component). Thus, Saratov contains phase Q without presolar diamond. A study of the Raman spectroscopic parameters for the HF-HCl residue and the oxidized residue shows large changes due to oxidation. The directions of these changes are the same as observed in Allende, except oxidation increased the ID/IG (intensity ratio of the D band to the G band) in Saratov but decreased in Allende. This difference may be attributed to the different crystalline stages of carbon in both meteorites. The shifts in the Raman parameters to a discrete and/or more expanded region suggest that (1) oxidation changes the crystalline condition of graphitic carbon, (2) phase Q is not a dissolved site, and (3) the release of Q-gas is simply related to the rearrangement of the carbon structure during oxidation.

Reference
Matsuda J-I, Morishita K, Nara M, Amari S (2015) Noble gases in oxidized residue prepared from the Saratov L4 chondrite and Raman spectroscopic study of residues to characterize phase Q. Meteoritics & Planetary Science (in Press)
Link to Article [DOI: 10.1111/maps.12587]
Published by arrangement with John Wiley & Sons

¹Wei Wang, ²Yongli Song, ²Xianjie Wang, ²Yanqiang Yang, ³Xiaoyang Liu
¹Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin, China.
²Department of Physics, Harbin Institute of Technology, Harbin, China.
³State Key Lab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China.

We currently do not have a copyright agreement with this publisher and cannot display the abstract here

Reference
Wang W, Song Y, Wang X, Yang Y, Liu X (2015) Alpha-Oxo Acids Assisted Transformation of FeS to Fe3S4 at Low Temperature: Implications for Abiotic, Biotic, and Prebiotic Mineralization. Astrobiology 15 1043-1051.
Link to Article [doi:10.1089/ast.2015.1373]

¹C. Tubiana, ^1,2C. Snodgrass, ³R. Michelsen, ³H. Haack, ¹H. Böhnhardt, ⁴A. Fitzsimmons, ⁵I. P. Williams
¹Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 33077 Göttingen, Germany
e-mail: tubiana@mps.mpg.de
²Planetary and Space Sciences, Department of Physical Sciences, The Open University, Milton Keynes, MK7 6AA, UK
³Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, 1350 Copenhagen, Denmark
⁴Astrophysics Research Centre, Department of Physics and Astronomy, Queen’s University Belfast, Belfast BT7 1NN, UK
⁵School of Physics and Astronomy, Queen Mary, University of London, London E1 4NS, UK

We currently do not have a copyright agreement with this publisher and cannot display the abstract here

Reference
Tubiana C, Snodgrass C, Michelsen R, Haack H, Böhnhardt H, Fitzsimmons A, Williams IP (2015) 2P/Encke, the Taurid complex NEOs and the Maribo and Sutter’s Mill meteorites. Astronomy & Astrophysics 584, A97
Link to Article [http://dx.doi.org/10.1051/0004-6361/201425512]