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Experimental Study of Partial Melting of Mantle Peridotite -A Discussion about the Genesis of Sih'ca-rich Fluids (Melts)

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Acta Geologica Sinica(English Edition) 1999年第4期73卷 395-403页

作者： li jianping guangzhou institute of geochemistry, chinese academy of sciences, guangzhou, 510640, chinaand kornprobst jacques departement des sciences de la terre, universite blaise pascal, 610038 clermont-ferrand, france chinese Acad Sci Guangzhou Inst Geochem Guangzhou 510640 Peoples R China Univ blaise pascal Dept Sci Terre F-610038 Clermont Ferrand France

Experiments on partial melting of mantle lherzolite have been realized at 0.6 and 1.0 GPa and the chemical compositional variations of melts during different melting stages have been first discussed. The results show that the trends of variations in SiO2, CaO, Al2O3, Na2O and TiO2 are different at different melting stages. The melts produced at lower pressure are richer in SiO2 than those at higher pressure. The mantle-derived silica-rich fluids (silicate melts) are polygenetic, but the basic and intermediate-acid silicate melts in mantle peridotite xenoliths from the same host rocks, which have equivalent contents of volatile and alkali components and different contents of other components, should result from in-situ (low-degree) partial melting of mantle peridotite under different conditions (e.g. at different depths, with introduction of C-O-H fluids or in the presence of metasomatic minerals). The intermediate-acid melts may be the result of partial melting (at lower pressure) Opx + Sp + K-Na-rich fluid ±(Am-phi) ± (Phlog) = OI + melt. But the intermediate-acid magmas cannot be produced from the partial melting of normal mantle peridotite unless the crustal materials are introduced to some extent.

关键词： mantle peridotite in-situ partial melting compositional variation of melt genesis of silica-rich fluid (stlicate melt)

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Subsolidus phase relations in the system MgO-ZnO-SiO_2 at high pressure

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chinese Science Bulletin 1999年第12期44卷 1146-1149页

作者： li jianping, jacques kornprobst Didier laporte guangzhou institute of geochemistry , chinese academy of sciences , guangzhou 510640, China departement des sciences de la terre, University Blasie pascal, 630038 clermont-ferrand, france guangzhou institute of geochemistry Chinese Academy of Sciences Guangzhou China Département des sciences de la terre Université Blasie Pascal Clermont-Ferrand France

The subsolidus phase relations were determined experimentally in the system MgO-ZnO-SiO2 at 1.0 GPa and 1 200℃, by use of the high-pressure apparatus "piston-cylinder". The results showed characteristics of the phases assemblage different from that in similar ternary systems. It is impossible to form complete Mg2SiO4-Zn2SiO4 olivine and Mg2Si2O6-Zn2Si2O6 pyroxene solid solution. This is controlled by the properties of Zn2+ with an outer layer of electron (Ar)3d10, different from others transition metal ions, like Fe2+ , Ni2+ , Co2+ .

关键词： high pressure MgO-ZnO-SiO2 system subsolidus phase relation.

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