Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1951h&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 11, p. 1951-1954
Physics
12
Geochemistry: Composition Of The Mantle, Geochemistry: Isotopic Composition/Chemistry, Planetology: Solid Surface Planets: Atmospheres-Evolution, Planetology: Solid Surface Planets: Origin And Evolution
Scientific paper
Primordial helium-neon abundance ratios in the Earth have been accurately determined, based on helium and neon isotopic systematics observed in mid-ocean ridge basalts (MORBs) and Hawaiian ocean island basalt (OIB) samples. The mean primordial 3He/22Ne ratios for the MORB and Hawaiian OIB samples are 10.2+/-1.6 and 6.0+/-1.4, respectively. The gross average of all values is 7.7+/-2.6, about twice the solar 3He/22Ne ratio of 3.8. Thus, primordial helium and neon in the Earth are elementally fractionated from the solar composition, noting, however, that the Earth's primordial helium and neon are isotopically solar in composition. This elemental fractionation between helium and neon was probably caused by solubility-controlled degassing processes at an early stage of the Earth's evolution.
Honda Masahiko
McDougall Ian
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