Computer Science
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..139a&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Jan. 1990, p. 139-154.
Computer Science
7
Degassing, Earth (Planet), Geodynamics, Magma, Fractionation, Mass Transfer, Metamorphism (Geology), Planetary Evolution, Subduction (Geology)
Scientific paper
On the basis of relationships among the solids, melts, and volatiles and the mass transfer of terrestrial matter through space and time, the most important stages of terrestrial degassing processes are identified. These processes are formalized both on local and global scales and are combined in a single model of evolution of the upper mantle, the crust, and the atmosphere. The following stages in the evolution of the earth are envisaged: an early intensive convection and fractionation in the upper mantle resulting in sharp degassing of its matter, followed by a relatively slow convection in this reservoir accompanied by partial melting of silicate matter in the rift and subduction zones; an uplift of melts into the oceanic and continental crust and their degassing; an early formation and subsequent recycling of the continental crust and its degassing due to intracrustal magmatism and metamorphism; and the accumulation of gases in the atmosphere.
Azbel Ia. I.
Tolstikhin I. N.
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