Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.117..229a&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 117, no. 1-2, p. 229-233.
Physics
21
Cosmic Dust, Earth Environment, Earth Mantle, Geochemistry, Helium Isotopes, Neon Isotopes, Degassing, Isotope Effect
Scientific paper
Recent developments in rare gas geochemistry suggest that the terrestrial atmosphere was generated by degassing part of the Earth's mantle. Neon, however, does not fit into this picture because the (Ne-20)/(Ne-22) ratios in MORB (between 10 and 13) and in air (9.8) are very different, and there exists no nuclear reaction which could be responsible for the high (Ne-20)/(Ne-22) ratios of up to 13 in upper mantle derived basalts. We have therefore previously proposed that cosmic He and Ne implanted in micrometeorites were introduced into the mantle by subduction after the major part of mantle degassing was achieved. Here we explore a simple neon input-output steady-state budget for the shallower degassed mantle, which shows that most of the Ne-20 in this reservoir can be of extraterrestrial origin, whereas the same source could be responsible only for a small fraction of the He-3 there.
Allègre Claude J.
Sarda Philippe
Staudacher Thomas
No associations
LandOfFree
Speculations about the cosmic origin of He and Ne in the interior of the Earth does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Speculations about the cosmic origin of He and Ne in the interior of the Earth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speculations about the cosmic origin of He and Ne in the interior of the Earth will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1853229