Compositional trends in rock-forming elements of Comet Halley dust

Details Compositional trends in rock-forming elements of Comet Halley dust Compositional trends in rock-forming elements of Comet Halley dust

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...258..266f&link_type=abstract

Science (ISSN 0036-8075), vol. 258, no. 5080, p. 266-269.

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44

Chemical Composition, Cosmic Dust, Halley'S Comet, Solar System Evolution, Iron, Magnesium, Organic Compounds, Rocks

Scientific paper

The VEGA 1 and 2 spacecraft flew by Comet P/Halley in 1986 carrying, among other instruments, two mass spectrometers to measure the elemental composition of dust particles emitted from the comet. Most particles seem to be a mixture of silicates of variable magnesium-iron composition and organic matter. Comprehensive study of data and consideration of the mass of dust particles reveal cometary grains of 'unusual' composition: magnesium-rich and iron-rich particles. Magnesium-rich particles are most likely magnesium carbonates, which could not have formed under conditions of equilibrium condensation but rather require formation by aqueous alteration. The composition of the iron-rich particles can also be related to secondary processes in the comet.

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