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《Geochimica》 1985-04
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THE USE OF BOND DISSOCIATION ENERGY TO ANALYZE THE GEOCHEMICAL BEHAVIOR OF URANIUM IN THE PROCESS OF GRANITIC MAGMATISM

Zhang Bangtong(Department of Geology, Nanjing University)  
It is estimated that the uranium-oxygen bond dissociation energy (Du+-o=350 kcal mole) is higher than silicon- and aluminium bond dissociation energies (Dsi4+-o=302, DAl3+-o = 264 kcal mole). During the process of magmatic differentiation with the in-crease of the degree of polymerization for silicon-oxygen complex ion, uranium in gra-nitic melts tends to combine with oxygen to form the coordination polyhedron [U0x]2x-n and also occur in the form of nuclei and crystals of uranite, as has been demonstrated by the induced fission-track study of quartz syenite from Huangmei jian.
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