The terrestrial economy of helium and argon

Details The terrestrial economy of helium and argon The terrestrial economy of helium and argon

Aug 1959

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959gecoa..17...37t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 17, Issue 1-2, pp.37-43

Economy

11

Scientific paper

Using a model of continuous degassing of the earth and recent data on the chemical composition of chondritic meteorites, a "degassing constant," , is determined from the argon-40 economy of the earth. The value of , assuming an earth 4.55 × 10 9 years old, is 2.81 × 10 -11 year -1 . On the assumption that is constant for all volatiles escaping from the earth, the helium economy of the earth is discussed. On the same premise the primordial water concentration of the solid earth, devoid of a hydrosphere, is determined to be 2300 p.p.m. which compares favourably with 2650 p.p.m. for chondrites. The small size of indicates that the rate of water release from the earth has been sensibly constant over the past 4.55 × 10 9 years.

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