TY - JOUR
T1 - Phase equilibria and mineral parageneses of metabasites in low- grade metamorphism.
AU - Liou, J. G.
AU - Maruyama, S.
AU - Cho, M.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 1985
Y1 - 1985
N2 - The system CaO-Al2O3-Na2O-MgO-SiO2-H2O is suitable for modelling phase equilibria and mineral parageneses for low-T metamorphism of basaltic rocks; univariant reactions marking the transitions between various sub-greenschist facies are identified and some have been determined experimentally. The introduction of Fe2O3 into a model of fixed FeO/MgO ratio creates continuous reactions for facies boundaries and discontinuous reactions for invariant points. The XFe3+ isopleths for epidote are plotted to illustrate the transition from the zeolite facies, through prehnite-pumpellyite to the prehnite-actinolite facies, and T-XFe3+ relations are established for both continuous and discontinuous reactions relating such facies transitions. An isobaric Al-Ca-Fe3+ plot from the chlorite projection can be applied to low-T metamorphic rocks where two or three Ca-Al silicates occur.-R.A.H.
AB - The system CaO-Al2O3-Na2O-MgO-SiO2-H2O is suitable for modelling phase equilibria and mineral parageneses for low-T metamorphism of basaltic rocks; univariant reactions marking the transitions between various sub-greenschist facies are identified and some have been determined experimentally. The introduction of Fe2O3 into a model of fixed FeO/MgO ratio creates continuous reactions for facies boundaries and discontinuous reactions for invariant points. The XFe3+ isopleths for epidote are plotted to illustrate the transition from the zeolite facies, through prehnite-pumpellyite to the prehnite-actinolite facies, and T-XFe3+ relations are established for both continuous and discontinuous reactions relating such facies transitions. An isobaric Al-Ca-Fe3+ plot from the chlorite projection can be applied to low-T metamorphic rocks where two or three Ca-Al silicates occur.-R.A.H.
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U2 - 10.1180/minmag.1985.049.352.03
DO - 10.1180/minmag.1985.049.352.03
M3 - Article
AN - SCOPUS:0022007962
VL - 49
SP - 321
EP - 333
JO - Mineralogical Magazine
JF - Mineralogical Magazine
SN - 0026-461X
IS - 3
ER -