摘要
The melting crust of Kirin Meteorite can be divided into two types: the initial melting shell and the secondary melting shell. Resulting from rapid chilling of hot melts in an oxidation atmosphere, they consist of mierolites (initial melting shell)and crystallites (secondary melting shells) of magnetite and glasses of the composition of Si, Mg and Fe. A gradation shell is observed under the melting crust. Its upper parts composed of dust-like magnetite, while the lower parts are made up largely by network veiulet of troilite of secondary origin. They are the products of thermal diffusion under oxidation and reduction conditions respetively. Indications of partial melting have been found within the gradation shell. The average temperature gradient has been estimated to be 20° C/micron and 1.6° C/micron for the melt in meteorite surface and the surface of solid phases respeetively. The temperature can be expressed as a function of depth by the empirical formula of T = 10000 H^-0.42.
The melting crust of Kirin Meteorite can be divided into two types: the initial melting shell and the secondary melting shell. Resulting from rapid chilling of hot melts in an oxidation atmosphere, they consist of microlites (initial melting shell) and crystallites (secondary melting shells) of magnetite and glasses of the composition of Si, Mg and Fe. A gradation shell is observed under the melting crust. Its upper parts composed of dust-like magnetite, while the lower parts are made up largely by network veinlet of troilite of secondary origin. They are the products of thermal diffusion under oxidation and reduction conditions respctively. Indications of partial melting have been found within the gradation shell. The average temperature gradient has been estimated to be 20°C/micron and 1.6° C/micron for the melt in meteorite surface and the surface of solid phases respectively. The temperature can be expressed as a function of depth by the empirical formula of T = 10000 H-0.42
出处
《地球化学》
CAS
1977年第4期300-307,319-320,共10页
Geochimica
