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《Acta Petrologica Sinica》 1990-02
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EXPERIMENTAL STUDY ON THE PARTITIONING MECHANISM OF Pb AND Zn BETWEEN GRANITIC SILICATE MELTS AND AQUEOUS FLUIDS

Peng Shenglin (Central South university of Technology, Changsha, 410083) Zheng Jilang (Research Institute of Geology for Mineral Resources, China National Nonf errous Metals Industry Corporation, Guilin, 541004)  
Three new experimental techniques9 i.e. the solid-liquid preparing teehnique, the treatment technique of gold capsules and the measurement procedure, have been designed and used for finishing three series of experiments of Pb and Zn partitioning between granitie silicate melts and aqueous fluids. A series of partitioning coefficients (D_(Me)~(V/L)),defined as the ratio of the concentration of metal elements (Me)in fluids(V) to that in melts(L), have been determined, It is clear in the experimental results that D_(Me)~(V/L) is proportional to less than or near 1 power of the NaCl mole coneentration[m_(NaCl)], and thatD_(Me)~(V/L) increases with the Cl(Na)fractions in the system, but reduces with the increasing F(K) fractions instead. On the other hand, it is shown in our theoretical analysis that under the magmatie parameters, Pb and Zn might exist in the form of hydroxyl-chloride, [Me(OH)Cl_3], in the fluids phase. In the melt phase, however, Pb and Zn might dominantly be fitted in the lattice of aluminosilieate tetrahedron by non-bridging oxygen. The cations could be replaced by H~+ ions derived from hydrolysis through the proton-cation exchange reactions. If the partition reaction is as follows. _LMe~(2+)+_VNaCl+_VH_2O=_VMe(OH)Cl+_LNa~++_LH~+, D_(Me)~(V/L) would be proportional to less than 1 power. When there is a host of chlorine in the system, Pb and Zn would associate with a large number of Cl~- ions favourable for partition into the fluids and OH~- ions derived from hydrolysis to form stable hydroxyl-chlorides because of the distinctive differences in the polymerization and the partition coefficient between fluorine and chlorine. When fluorine is rich, however, Pb and Zn would tend to hold in the melt because of the polymerization of luorine favourable for partition into the melt phase. When fluorine is rich the D_(Me)~(V/L) would therefore be much less than that when chlorine is rich. In addition, when potassium is rich the D_(Me)~(V/L) would be slightly less than that when sodium is rich, because of slight differences in the polymerization and the partition coefficients between potassium and sodium. The partitioning regularity and mechanism of Pb and Zn have been discussed based on the experimental results and theoretical, analysis in the paper.
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1 Peng Shenglin (Department of Geology, South-Central University of Technology, Changsha);THE EXPERIMENTAL RESULTS OF Pb AND Zn PARTITIONING BETWEEN FLUID AND MELT, AND THEIR APPLICATION TO THE RESEARCH ON MINERALIZATION[J];Chinese Journal of Geology;1988-04
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