caa a22 4500 465791581 CHVBK 20180323112026.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00286827 doi (NATIONALLICENCE)springer-10.1007/BF00286827 Hoschek Gert Institut für Mineralogie und Petrographie, Universität Innsbruck, A-6020, Austria aut Melting and subsolidus reactions in the system K2O−CaO−MgO−Al2O3−SiO2−H2O: experiments and petrologic application [Elektronische Daten] [Gert Hoschek] Experiments with synthetic starting materials of muscovite, phlogopite, zoisite, kyanite and quartz were performed in the pressure temperature range 10-25 kbar, 640-780° C under water excess conditions. The reaction muscovite+zoisite+quartz+vapor=liquid+kyanite was bracketed at 10.5 kbar/689-700° C, 15.5 kbar/709-731° C and 20 kbar/734-745° C. The equivalent reaction in the Mg-bearing system muscovitess +zoisite+quartz+vapor=liquid+kyanite+phlogopitess lies at the same temperature around 10 kbar and approximately 10° C higher around 20 kbar, compared with the Mg-free reaction. At slightly higher temperatures formation of melt and tremolitess was reversibly observed from the assemblage phlogopitess+zoisite +kyanite+quartz around 10.5 kbar/690-710° C, 15.5 kbar/720-750° C and 20.5 kbar/745-760° C. In the subsolidus region, the reaction muscovitess+talcss+ tremolitess=phlogopitess+zoisite+quartz+vapor were located in the range 700° C/16.7-19.0 kbar and 740° C/19.7-20.8 kbar. From these data, a wedge shaped stability field of phlogopitess+zoisite+quartz appears with a high P, T termination around 21 kbar/755° C. Muscovite+tremolite+talc or kyanite comes in at higher pressures. These phase relations are in qualitative accord with petrographic observations from high pressure metamorphic areas. Formation and crystallization of melts in rocks of a wide compositional range involving zoisite/epidote has been ascribed to relatively high pressures and is consistent with experimentally determined stability fields in the simplified KCMASH system. Springer-Verlag, 1990 Contributions to Mineralogy and Petrology Springer-Verlag 105/4(1990-09-01), 393-402 0010-7999 105:4<393 1990 105 410 https://doi.org/10.1007/BF00286827 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00286827 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Hoschek Gert Institut für Mineralogie und Petrographie, Universität Innsbruck, A-6020, Austria aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 105/4(1990-09-01), 393-402 0010-7999 105:4<393 1990 105 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer