Noble Gases in the Earth's Mantle
The abundances and isotopic compositions of noble gases in two samples from ultramafic xenoliths in alkali basalt, a young kaersutitic amphibole separated from a peridotite xenolith from Dish Hill, California and an ancient whole-rock lherzolite xenolith from Baja California, are reported and compared with the results of analyses on other mantle samples. In addition to previously recognized excesses of 3He and 129Xe, our results indicate that ambient gases in the mantle show a general enrichment of the lighter-mass nonradiogenic isotopes of Ar, Kr and Xe, and Ar with 40Ar/36Ar = 3 · 102.
D. P. Thompson et al., "Noble Gases in the Earth's Mantle," Physics of the Earth and Planetary Interiors, vol. 17, pp. 98-107, Elsevier, Sep 1978.
The definitive version is available at http://dx.doi.org/10.1016/0031-9201(78)90051-1
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