Systematic Analyses of Major Element Distributions in GEMS from High Speed IDPs

Details Systematic Analyses of Major Element Distributions in GEMS from High Speed IDPs Systematic Analyses of Major Element Distributions in GEMS from High Speed IDPs

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..625j&link_type=abstract

Lunar and Planetary Science, volume 27, page 625

Astronomy and Astrophysics

Astronomy

5

Comets, Gems, Grains: Interstellar, Interplanetary Dust Particles, Irradiation

Scientific paper

As we reported last year, all of the highest speed stratospheric IDPs that we have identified by the stepped He release method of Nier and Schlutter, contain GEMS as a major component. GEMS are submicron rounded units composed of glass with embedded metal and sulfide grains. Internal composition gradients in GEMS, consistent with extensive pre-accretional irradiation, have been reported by Bradley. Many of the properties of GEMS are consistent with astronomically observable effects caused by interstellar silicate grains. We report here detailed elemental analyses of the internal compositions of GEMS in a subset of IDPs selected on the basis of their high speed entry into the atmosphere, an indicator of likely cometary origin.

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