| Reference Type | Journal (article/letter/editorial) |
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| Title | Phase equilibria and mixed parageneses of metabasites in lowgrade metamorphism |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Liou, J. G. | Author |
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| Maruyama, S. | Author |
| Cho, M. | Author |
| Year | 1985 (June) | Volume | 49 |
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| Issue | 352 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_49/49-352-321.pdf+ |
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| DOI | doi:10.1180/minmag.1985.049.352.03Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3738 | Long-form Identifier | mindat:1:5:3738:3 |
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| GUID | 0 |
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| Full Reference | Liou, J. G., Maruyama, S., Cho, M. (1985) Phase equilibria and mixed parageneses of metabasites in lowgrade metamorphism. Mineralogical Magazine, 49 (352) 321-333 doi:10.1180/minmag.1985.049.352.03 |
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| Plain Text | Liou, J. G., Maruyama, S., Cho, M. (1985) Phase equilibria and mixed parageneses of metabasites in lowgrade metamorphism. Mineralogical Magazine, 49 (352) 321-333 doi:10.1180/minmag.1985.049.352.03 |
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| In | (1985, June) Mineralogical Magazine Vol. 49 (352) Mineralogical Society |
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| Abstract/Notes | AbstractThe 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. |
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