Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28r.443s&link_type=abstract
Meteoritics, vol. 28, no. 3, volume 28, page 443
Other
1
Carbon, Dust, Interplanetary, Time-Of-Flight Secondary Ion-Mass Spectrometry
Scientific paper
Three carbon-rich stratospheric particles were selected for time-of-flight secondary-ion-mass-spectrometry (TOF-SIMS) analyses to continue our efforts to investigate element distributions in IDPs with high lateral resolution (~0.2 micrometers) [1,2]. The samples, one anhydrous and two hydrated IDPs, were previously investigated with SEM EDX and subsequently with TEM [3,4]. For our analyses we used particle residues in epoxy. Besides TOF-SIMS spectra for a quantitative analysis secondary ion images were acquired for positive and negative ions [2]. Abundances of nine elements relative to Si and normalized to CI chondrites for all three particles are shown in Fig. 1, which appears in the hard copy. L2006B21, the anhydrous particle, has ~15 wt% C [3]. Our results show CI abundances relative to Si for Na, K, Ca, and Ti within a factor of 2. Mg, Al, Cr, Mn, and Fe are depleted by a factor of 2.3-3.9 (Fig. 1), which is comparable to the element ratios in Halley's dust [5]. Carbon is distributed homogeneously over the sample. L2006J14 and L2006F10, two hydrated IDPs, have 22 and 15 wt% C, respectively [4]. L2006J14 shows chondritic element ratios for Al, K, Ca, Cr, Mn, and Fe, whereas Na, Mg, and Ti are enriched (Fig. 1). Carbon is distributed homogeneously. From our secondary ion images, L2006F10 seemed to be contaminated, possibly during ultramicrotome thin sectioning. Element abundances scatter around chondritic abundances (Fig. 1) and may be not indigenous to the sample. Carbon is highly enriched in a few regions of L2006F10, <1 micrometers in diameter, respectively, and is not correlated with other elements. Both hydrated particles show evidence for a Br enrichment. The Br-/Cl- secondary ion ratios are close to stratospheric element ratios [6] supporting the contamination theory [7]. The problem of contamination of stratospheric particles by silicone oil as a possible source for carbon enrichments has been discussed before [8]. This can be excluded for our three particles. Although TOF-SIMS is very sensitive to silicone oil, the data show no evidence for its presence in the particles. TOF-SIMS is suitable to discern between hydrated and anhydrous particles. Possible indicators are H-/O-- or OH-/O- ratios. References: [1] Stephan T. et al. (1992) Meteoritics, 27, 292. [2] Stephan T. et al. (1993) LPSC XXIV, 1349-1350. [3] Thomas K. L. et al. (1993) LPSC XXIV, 1425-1426. [4] Keller L. P. et al. (1993) LPSC XXIV, 785-786. [5] Jessberger E. K. et al. (1989) In Origin and Evolution of Planetary and Satellite Atmospheres (S. K. Atreya et al., eds,), 167-191, Univ. of Arizona, Tucson. [6] Sutton S. R. and Flynn G. J. (1990) Proc. LPSC 20th, 357-361. [7] Jessberger E. K. et al. (1992) EPSL, 112, 91-99. [8] Thomas K. L. et al. (1993) GCA, in press.
Behla F.
Jessberger Elmar K.
Keller Lindsay P.
Klöck W.
Stephan Thomas
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