Rare gas systematics - Formation of the atmosphere, evolution and structure of the earth's mantle

Details Rare gas systematics - Formation of the atmosphere, evolution and structure of the earth's mantle Rare gas systematics - Formation of the atmosphere, evolution and structure of the earth's mantle

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..81..127a&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 81, no. 2-3, Jan. 1987, p. 127-150.

Computer Science

115

Earth Mantle, Geochemistry, Planetary Evolution, Primitive Earth Atmosphere, Rare Gases, Basalt, Geodynamics, Granite, Isotopes, Mass Balance, Outgassing, Potassium

Scientific paper

To explain the rare gas content and isotopic composition measured in modern terrestrial materials was explored. An earth model based on four reservoirs: atmosphere, continental crust, upper mantle, and lower mantle, was explored. This exploration employs three tools: balance equations, the concept of mean age of outgassing, and the systematic use of all of the rare gases involving both absolute amount and isotopic composition. The results obtained are as follows: half of the earth's mantle is 99 percent outgassed. Outgassing occurred in an early, very intense stage within the first 50 Ma of earth history and a slow continuous stage which continues to the present day. The mean age of the atmosphere is 4.4 Ga. The model with four main reservoirs explains quantitatively both isotopic and chemical ratios, assuming that He migrates from the lower to the upper mantle whereas the heavy rare gases do not. Noble gas fluxes for He, Ar, and Xe from different reservoirs have been estimated. The results constrain the K content in the earth to 278 ppm. Several geodynamic consequences are discussed.

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