Mathematics – Logic
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28r.448t&link_type=abstract
Meteoritics, vol. 28, no. 3, volume 28, page 448
Mathematics
Logic
2
Aggregates, Fine-Grained, Carbon, Cluster Particles, Interplanetary Dust Particles
Scientific paper
Anhydrous interplanetary dust particles (IDPs) containing fine-grained aggregates (FGAs) have chondritic element abundances, characteristic textures, and high 4He and Zn abundances. These FGAs can account for >75 vol% of some anhydrous IDPs [1]. We previously noted a correlation of carbon abundance with modal pyroxene content in anhydrous particles [2]. In this study, we analyzed multiple fragments from individual cluster particles to determine (1) if carbon content is correlated with the abundance of FGAs and (2) the extent of chemical and mineralogical heterogeneities of particle clusters. We examined 15 IDPs from 7 distinct clusters of particles on the large area collectors using methods described in [2]. Optically light and dark fragments were selected from each cluster in order to sample a variety of material. Major-, minor-, and light-element compositions and mineralogical data are given for the cluster particle fragments in Table 1. Of the seven clusters sampled, two are coarse-grained and five are dominated by FGAs (>50% of the particle volume). Four of the seven clusters have pyroxene as the dominant crystalline silicate, one has a subequal mixture of pyroxene and olivine, one is dominated by sulfides, and one is dominated by olivine. L2005, #17 and L2005, #26 contain FeZnS grains. The C abundance is chondritic (<3x CI) for five of the clusters; only two clusters have high C abundances. All major and minor elements are within 2x CI for all clusters with the exception of Na, which is typically >2x CI. Solar flare tracks were observed in L2005,, #19. Compositional differences were observed between light and dark fragments from all clusters except cluster L2006, #28, indicating that most clusters are heterogeneous at the 10-micrometer scale. In general, the C abundance and the sulfide content in the dark fragments are greater than or equal to that in the light fragments. Carbon abundance does not appear to correlate with the content of FGAs. Another example of heterogeneity within clusters is L2005, #26; mineralogical analysis of one of the fragments of this cluster showed it to be dominated by Fe sulfides, whereas SEM analysis of two other fragments showed no evidence of sulfide enrichment. Our study suggests that conclusions drawn from one fragment of a cluster are not necessarily representative of other fragments from the same cluster. Acknowledgments: This work was supported by NASA RTOPs 152-17-40-23 and 199- 52-11-02. References: [1] Bradley J. P.(1992) LPSC, 24, 171-172. [2] Thomas K. L. et al. (1993) GCA, 57, 1551-1566.
Blanford George E.
Keller Lindsay P.
Klöck W.
McKay David S.
Thomas Kathie L.
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