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Related Experiment Videos

Interstellar water in meteorites?

E Deloule1, F Robert

  • 1CRPG-CNRS, France.

Geochimica Et Cosmochimica Acta
|November 1, 1995
PubMed
Summary
This summary is machine-generated.

Deuterium-rich hydrogen in meteorites Renazzo and Semarkona is carried by phyllosilicates, not from nebular condensation. Interstellar chemical reactions likely explain these high D/H ratios.

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Area of Science:

  • Cosmochemistry
  • Isotope Geochemistry
  • Planetary Science

Background:

  • Meteorites Renazzo (CR) and Semarkona (LL3) display significant deviations in hydrogen isotopic ratios (D/H) from terrestrial values.
  • Previous interpretations of deuterium enrichment in meteorites have proposed various hydrogen carriers and formation mechanisms.

Purpose of the Study:

  • To determine the D/H ratios in Renazzo and Semarkona meteorites.
  • To identify the specific carriers of deuterium-rich hydrogen within these meteorites.
  • To investigate the origin of high D/H ratios and their implications for early solar system conditions.

Main Methods:

  • Analysis of D/H ratios using the CRPG Nancy ion microprobe.
  • Correlating D/H ratios with chemical compositions (H2O, K, Si, C/H) of potential hydrogen carriers.

Related Experiment Videos

  • Comparing D/H ratios in meteorite matrix and chondrules.

    • Main Results:

    • Phyllosilicates were identified as the primary carriers of deuterium-rich hydrogen in both Renazzo and Semarkona meteorites.
    • Distinct D/H ratios were observed between meteorite matrix (up to 700 x 10^-6) and chondrules (120-230 x 10^-6).
    • High D/H ratios in water-bearing minerals are inconsistent with thermal production in a dense solar nebula.

    Conclusions:

    • Deuterium enrichment in Renazzo and Semarkona meteorites is attributed to phyllosilicates, challenging prior interpretations.
    • The observed isotopic enrichments suggest formation through chemical reactions (ions or radicals) in interstellar space or the outer nebula (110-140K).
    • Water in these meteorites is unlikely to be a simple product of nebular condensation under equilibrium conditions (T > 160K).