Thermal effects of chemical reactions in the undifferentiated earth |
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| Authors: | OL Kuskov NI Khitarov |
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| Institution: | V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry, U.S.S.R. Academy of Sciences, Moscow U.S.S.R. |
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| Abstract: | Calculations of thermal effects of oxidation-reduction reactions in the open systems for the undifferentiated earth have been carried out up to 2000 kbar. It is shown that a change in the sign of the thermal effect occurs with increase of pressure in these open systems: endothermal reactions which occur at pressures Ps < Pc become exothermal at pressures Ps > Pc and vice versa. At a certain critical pressure Ps = Pc the enthalpy of reaction is equal to zero.The results of calculations show that the central part of the earth and the deep interior could become warm due to reduction processes (for example reduction of ferromagnesian silicates and oxides, and stishovite) during core formation. Reducing conditions in the undifferentiated earth during core formation imply that a large fraction of the total heat of chemical reactions was released in the deep interior and was absorbed in the upper parts of the planet. |
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