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Phase equilibria and mixed parageneses of metabasites in lowgrade metamorphism

Published online by Cambridge University Press:  05 July 2018

J. G. Liou ,
S. Maruyama  and
M. Cho
J. G. Liou
Affiliation:
Department of Geology, Stanford University, Stanford, California 94305, USA
S. Maruyama
Affiliation:
Department of Geology, Stanford University, Stanford, California 94305, USA
M. Cho
Affiliation:
Department of Geology, Stanford University, Stanford, California 94305, USA
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Abstract

The system Na2O-CaO-MgO Al2O3-SiO2-H2O is proposed to model phase equilibria and mineral parageneses for low-temperature metamorphism of basaltic rocks. Univariant reactions marking the transitions between various sub-greenschist facies are identified and some have been experimentally determined. The introduction of Fe2O3 into the model system at fixed FeO/MgO ratio creates continuous reactions for facies boundaries and discontinuous reactions for invariant points of the model system. Both qualitative and quantitative effects on P-T displacement and phase compositions are discussed. The XFe3+ isopleths for epidote were plotted to exemplify the transition from the zeolite through prehnite-pumpellyite to prehnite-actinolite facies. T-XFe3+ relations were established for continuous and discontinuous reactions relating such facies transitions. Because of the common occurrence of two or three Ca-Al hydrosilicates in low-grade metabasites, an isobaric Al-Ca-Fe3+ projection from chlorite may be used to illustrate mineral assemblages and compositions of the coexisting Ca-Al silicates in the presence of quartz, albite, and chlorite. Reported occurrences in several classic burial metamorphic terrains and ocean-floor metabasites in ophiolites are described. Only the composition of a mineral from a buffered assemblage can constrain the intensive properties for metamorphism; previously reported compositional trends for pumpellyite and epidote with increasing metamorphic grade are oversimplified.

Keywords

metamorphismmetabasitessubgreenschist facieszeolitesprehnitepumpellyiteactinoliteepidote
Type
Research Article
Information
Mineralogical Magazine , Volume 49 , Issue 352 , June 1985 , pp. 321 - 333
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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