Not all cluster particles in the NASA/JSC cosmic dust collection are extraterrestrial

Details Not all cluster particles in the NASA/JSC cosmic dust collection are extraterrestrial Not all cluster particles in the NASA/JSC cosmic dust collection are extraterrestrial

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1171r&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 171.

Mathematics

Logic

Cosmic Dust, Dust Collectors, Astronomical Catalogs, Interplanetary Dust, Chondrites, Nasa Space Programs, Japanese Space Program, Petrology, Transmission Electron Microscopy, Fragments

Scientific paper

With data from the NASA/JSC Cosmic Dust Catalogs it is possible to define the petrological properties of chondritic cluster interplanetary dust particles (IDPs) among a steady background of 'unbound' chondritic IDPs. An extraterrestrial source is indicated by a chondritic elemental distribution pattern that is inferred from the relative peak heights of Mg, Al, Si, S, Ca, Fe, and Ni in its EDS spectrum. This chemical signature, along with an particle morphology is used to designate individual IDPs as C (cosmic) or C?. It was recognized that a fraction of the nonspherical chondritic IDPs could be fragments of a larger cluster that broke apart during or just prior to impact onto the collector. Stringent criteria for the identification of cluster IDPs, or clusters in general, are not yet available. This past decade, eruptions witnessed significant volcanic activity that injected dust, including clusters, into the stratosphere. To test the reliability of cluster designation, I performed a detailed TEM study of particle L2011,12, listed as a fragment of cluster L2011 no. 21.

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