FORMATION PROCESS OF PLANETARY MATERIAL IN THE COLD NEBULA DECIPHERED FROM ISOTOPE IMAGING OF METEORITE ORGANIC MATTER

2014 Fiscal Year Final Research Report

• Project/Area Number: 23654191
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Astrochemistry
• Research Institution: Osaka University
• Principal Investigator: HASHIZUME KO 大阪大学, 理学(系)研究科(研究院), 助教 (90252577)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: 隕石有機物 / 同位体 / 硫黄 / 酸素 / イメージング / 非質量依存同位体分別

Outline of Final Research Achievements

Using the isotope imaging technique of sulfur by a secondary ion mass spectrometer, sulfur isotope analyses of organic matter extracted from a primitive meteorite was performed. In the studied sample, large oxygen non-mass-dependent isotope anomalies were previously reported in its organic matter. In the organic matter sample extracted from the carbonaceous chondrite, two micron-sized sulfur-isotope hotspots with 33S/32S and 34S/32S anomalies up to 3.4% and 4.4%, respectively, were observed. This result suggests presence of a large non-mass-dependent sulfur isotope fractionation in meteoritic organic matter.

Free Research Field

宇宙地球化学