Abstract
The join MgSiO3-MgAl2SiO6 was studied with the special reference to the solubility of Al2O3 in enstatite, above 1300°C. MgAl2SiO6 is incorporated in enstatite as much as 3.5wt.% (1.75wt. % Al2O3) at atmospheric pressure. At subsolidus temperatures the phase assemblage protoenstatitess+forsterite was confirmed in the composition ranging from 96.5 to 94.5wt. % MgSiO3. In the more aluminous region the subsolidus phase as-semblage is protoenstatitess+forsterite+cordieritess. The experimental result indicates that the composition of protoenstatite lies not only on the join MgSiO3-MgAl2SiO6 but also has a solid solution area on the MgO-Al2O3-SiO2 plane as shown in Fig. 4. The unit-cell dimensions of the protoenstatitess crystallized at 1300°C were determined. a, b, and V decrease with increasing Al2O3 contents in the protoenstatitess. The application of the results to meterorite as well as terrestrial rock is discussed. The Al2O3 contents of enstatite in meteorite may be used as an indicator of temperature scale.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
