ISSN:
1432-0967
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract The compositions of coexisting pyroxmangites, rhodonites, rhodochrosites and manganese calcites in regional metamorphosed manganese cale-silicate marbles from Val Scerscen and Alagna were analysed by microprobe and permit definition of critical tie lines at metamorphic grades appropriate to temperatures between 400 and 450 °C. Variations in composition of coexisting mineral pairs in one and the same locality are attributed to variations in $$f_{{\text{CO}}_{\text{2}} }$$ and not to metamorphic temperatures. From the analysed assemblages isothermal $$f_{{\text{CO}}_{\text{2}} } - X_{{\text{Ca/Ca + Mn}}}$$ plots (with SiO2 as excess component) were constructed for the system CaO-MnO-SiO2-CO2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00403423
