@article{oai:nipr.repo.nii.ac.jp:00004616,
 author = {Flynn,G.J. and Sutton,S.R. and Klock,W.},
 journal = {Proceedings of the NIPR Symposium on Antarctic Meteorites},
 month = {May},
 note = {P(論文), Micrometeorites from 60 to 1200μm in diameter constitute &acd;80% of the continuous, planet-wide accretion of meteoritic material onto the Earth. Although interplanetary dust particles (IDPs)<60μm are collected from the Earth's stratosphere, and particles>1cm are sampled as meteorites, the 60 to 1200μm size range has, thus far, only been sampled by the recovery of meteoritic particles from polar ices and lakes and from the sea. Polar micrometeorites have major element abundances consistent with chondritic meteorites and IDPs, except that Ni and S are strongly depleted. Synchrotron X-Ray Fluorescence trace element abundance measurements of twelve Antarctic and four Greenland micrometeorites from 50 to 150μm show enrichments by 2 to 5 times over CI abundances for Cu, Zn, and Ga, however Ni, Ge, and Se are depleted relative to CI. This abundance pattern differs significantly from both chondritic meteorites and IDPs, including IDPs heated on atmospheric entry. There is no correlation of element enrichment or depletion with nebula condensation temperature. Olivine, pyroxene, magnetite, chromite, spinel, and glass, which commonly occur in IDPs and meteorites, were identified in these particles by analytical transmission electron microscopy. However, layer-lattice silicates, also common in IDPs, CI and CM carbonaceous meteorites, were not identified in any of these polar micrometeorites. Textural relationships and mineral compositions suggest these polar micrometeorites were strongly heated during atmospheric entry. The chemical compositions and mineralogies of the polar micrometeorites show similarities to both the IDPs and the chondritic meteorites, but they are not identical to either type of material.},
 pages = {304--324},
 title = {Compositions and mineralogies of unmelted polar micrometeorites: Similarities and differeces with IDPs and meteorites},
 volume = {6},
 year = {1993}
}