Interaction between melt inclusions and synthetic host periclase on heating
Tomilenko, Anatοly A.; Kovyazin, Sergey V.
published: Dec 30, 1997
manuscript accepted: Sep 30, 1996
manuscript received: Mar 25, 1996
ArtNo. ESP147050901009, Price: 29.00 €
Abstract Detailed studies of melt inclusions in synthetic periclase, obtained from natural magnesite by arc-fusion, showed that their compositions essentially differ from the composition of the starting melt. They are to a greater extent enriched in elements (Si, Ca, Al, Fe) which are present in small amounts in the starting melt (does not exceed 4-5 wt.% in total). It is assumed that the trapping of these inclusions is intimately associated with segregation of components which do not enter the periclase lattice at the front of crystallization of the host mineral. Heating of the samples resulted in diffusive exchange of components between melt inclusions and host mineral (diffusion of iron from the inclusions into the matrix, and of magnesium from periclase into the inclusions takes place on heating). This process starts at 950°C and is considerably accelerated with the appearance of the first portions of melt (1250°C)