caa a22 4500 465790755 CHVBK 20180323112023.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00310648 doi (NATIONALLICENCE)springer-10.1007/BF00310648 Calculated mineral equilibria in the greenschist-blueschist-eclogite facies in Na2O−FeO−MgO−Al2O3−SiO2−H2O [Elektronische Daten] Methods, results and geological applications [Michel Guiraud, Tim Holland, Roger Powell] The new, greatly expanded internally-consistent dataset of Holland and Powell includes thermodynamic data for a wide range of mineral end-members in common rock-forming minerals, in particular, including FeMg-1 substitutions in glaucophane, garnet, chloritoid and carpholite, and FeMg-1 and MgSiAl-1Al-1 substitutions in talc and chlorite. Moreover, we have the uncertainties and correlations for these data. With the data, we have calculated the full pressure-temperature phase diagram for the system Na2O−FeO−MgO−Al2O3−SiO2−H2O (NFMASH) for quartz (or coesite) and H2O in excess, in the range 300°-800°C and 5-50 kbars. By solving the set of non-linear equations formed by the equilibrium relationships for an independent set of equations between the end-members in an assemblage in NFMASH, the compositions of the minerals (and PT) can be calculated. Thus the changes in MgSiAl-1Al-1 along NMASH reactions, and FeSiAl-1Al-1 along NFASH reactions, are calculated, and the changes in FeMg-1 and MgSiAl-1Al-1 along NFMASH reactions are calculated. From this information it is straightforward to generate PT diagrams for specific rock compositions. Mineral assemblages and mineral compositional changes in the phase diagram are discussed in relation to greenschist, blueschist and eclogite facies assemblages in metapelitic rocks. It is found that the correspondence between the predictions of the phase diagrams and the observations on rocks is remarkably good. When semiquantitative extensions of the phase diagram to include Ca(MgFe)-1, NaSiCa-1Al-1, Fe3+Al-1 and KNa-1 substitutions are taken into account the agreement is essentially complete. Springer-Verlag, 1990 Guiraud Michel Department of Geology, University of Melbourne, 3052, Parkville, Victoria, Australia aut Holland Tim Department of Earth Sciences, University of Cambridge, CB2 3EQ, Cambridge, United Kingdom aut Powell Roger Department of Geology, University of Melbourne, 3052, Parkville, Victoria, Australia aut Contributions to Mineralogy and Petrology Springer-Verlag 104/1(1990-01-01), 85-98 0010-7999 104:1<85 1990 104 410 https://doi.org/10.1007/BF00310648 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00310648 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Guiraud Michel Department of Geology, University of Melbourne, 3052, Parkville, Victoria, Australia aut NATIONALLICENCE 700 1- Holland Tim Department of Earth Sciences, University of Cambridge, CB2 3EQ, Cambridge, United Kingdom aut NATIONALLICENCE 700 1- Powell Roger Department of Geology, University of Melbourne, 3052, Parkville, Victoria, Australia aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 104/1(1990-01-01), 85-98 0010-7999 104:1<85 1990 104 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer