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Busemann, H.; Baur, H. and Wieler, R.
(2001).
URL: http://www.lpi.usra.edu/meetings/lpsc2001/pdf/1598...
Abstract
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.