Bulk chemical compositions for several hundred stratospheric micrometeorites have been determined using electron beam X‐ray analysis, proton‐induced X‐ray emission, synchrotron X‐ray fluorescence, secondary ion mass spectrometry, or instrumental neutron activation analysis. The chondrite‐like particles are chemically similar to carbonaceous chondrites but exhibit enrichments and depletions in some volatile elements that distinguish them from members of any of the conventional meteorite classes. One possibility is that the stratospheric micrometeorites are samples of a new, more primitive class of chondritic material.
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© 1994 American Institute of Physics.
1994
American Institute of Physics
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