Busemann, H.; Baur, H. and Wieler, R.
Helium isotopic ratios in carbonaceous chondrites: Significant for the early solar nebula and circumstellar diamonds?
In: 32nd Lunar and Planetary Science Conference, 12-16 March 2001, Houston, Texas, USA.
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Stepwise etching of acid-resistant residues from carbonaceous chondrites yields a new, extraordinarily low He isotopic ratio for phase Q that might represent early solar nebula composition. A much lower ratio possibly characterizes He-P3 from circumstellar diamonds.
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