A MICRO-SPECTROSCOPIC RESEARCH FOR
SEVERAL STONY AND CATEGORY 3 (ORGANIC)PARTICLES.
F. Kitajima1, M. Kotsugi2, T. Ohkochi2, H. Naraoka1, Y.
Ishibashi3, M. Uesugi3, Y. Karouji3, M. Abe3, A. Fujimura3, T.
Yada3, R. Okazaki1, T. Nakamura4, T. Noguchi5, K. Nagao6, A.
Tsuchiyama7, H. Yurimoto8, M. Ebihara9, M. Ito10, H. Yabuta11,
H. Mita12, Y. Takano10, T. Mukai3, S. A. Sandford13, T. Okada3,K. Shirai3, M. Ueno3, M. Yoshikawa3, and J. Kawaguchi3. 1Dept.
Earth Planet. Sci., Kyushu Univ. E-mail: kitajima@geo.kyushuu.ac.jp. 2SPring-8/JASRI 3ISAS/JAXA 4Dept. Earth Planet. Mater. Sci., Tohoku Univ. 5Coll. Sci., Ibaraki Univ. 6Geochem. Res.
Center, Univ. Tokyo 7Dept. Geol. and Mineral., Kyoto Univ.
8Natl Hist. Sci., Hokkaido Univ. 9Grad. School Sci. Engineer.
Tokyo Metropol. Univ. 10JAMSTEC 11Dept. Earth Space Sci.,
Osaka Univ. 12Dept. Life Environ. Mater. Sci., Fukuoka Inst.
Tech. 13NASA/ARC.
Introduction: Several stony and Category 3 (organic) particles returned by the HAYABUSA mission were analyzed insearch of chondritic insoluble organic matter (IOM). IOM is themajor fraction of the chondritic carbonaceous matter [1], and it
suggests that to what extent thermal metamorphism has proceeded [2-6]. We report here the Raman and IR results of two stonyparticles from the room B and three Category 3 particles, together
with the results of photoemission electron microscopy(PEEM) analysis of several stony particles.
Samples and methods: Two particles from the room B (RBQD04-0025 and RB-QD04-0049) and two Category 3 particles(RA-QD02-0008 and RB-QD04-0001) were analyzed by microRaman and FTIR techniques as intact as possible using a sample
holder made from diamond plates [7-8]. Two Category 3 particles(RB-QD04-0047-02 and RB-QD04-0001) pressed onto gold
plates were also analyzed. Four stony particles (RA-QD02-0010,RA-QD02-0031, RA-QD02-0068, and RB-QD04-0025) preparedas potted butt were investigated by PEEM at the end-station ofBL17SU in SPring-8.
Results and Discussion: The Raman bands from RB-QD040049 can be assigned to olivine as its major mineral. The bands
from RB-QD04-0025 can be assigned to pyroxene and merrilite.
However the spectra of these two particles lack in any Raman
bands relating to carbonaceous matter. A PEEM image of RAQD02-0068 showed one carbon-rich phase in this particle, however, the estimated peak metamorphic temperature of this phaseby Raman spectrum (248.0oC) seems too low for this particle.
The IR spectrum of the Category 3 particle RA-QD02-0008 is
characterized by broad O-H stretching, however, unlike chondritic IOM, aliphatic C-H stretching was not observed. The IR spectra of RB-QD04-0047-02 and RB-QD04-0001 also lack in aliphatic C-H stretching. The spectral features are different fromthat of chondritic IOM.
References: [1] Sephton M. A. 2002 Nat. Prod. Rep.
19:292-311. [2] Kitajima F. et al. 2002 GCA 66:163-172. [3]Quirico E. et al. 2005 Planetary and Space Science, 53:14431448. [4] Sandford S. A. et al. 2006 Science 314:1720-1724. [5]Cody G. D. et al., 2008 Earth Planet. Sci. Lett. 272:446-455. [6]Kebukawa Y. et al. 2010 Meteoritics & Planetary Science 45:99113. [7] Kitajima F. et al. 2011 42th Lunar & Planetary ScienceConference. Abstract #1855. [8] Kitajima F. et al. 2011 74th Annual Meeting of the Meteoritical Society. Abstract #5341.