Abstract
Interaction parameters derived using empirical calibration methods indicate strong non-ideality in the mixing of octahedrally-coordinated cations in muscovite and biotite. The data set used for calibration comprises mineral compositions from 49 samples containing quartz, muscovite, biotite, garnet, plagioclase and Al2SiO5 (kyanite or sillimanite). Pressures and temperatures in the data set were determined through the simultaneous application of geothermometry based on the garnet-biotite FeMg1 exchange equilibrium and geobarometry based on the anorthite-breakdown equilibrium. Two equilibria yielded simple expressions from which binary interaction parameters for octahedrally-coordinated cations in biotite could be directly determined. A four-component (Fe2+, Mg, Al, Ti) regular symmetric mixing model was assumed for biotite. One equilibrium yielded a simple expression from which an interaction parameter for the mixing of the MgAl-celadonite component in muscovite could be directly determined. Two sets of calculations were performed utilizing different calibrations of the garnet-biotite geothermometer and the anothite-breakdown geobarometer and different garnet activity models. Both placed samples within or near the stability field of the Al2SiO5 phase present in each sample and both yielded similar values for the interaction parameters within narrow uncertainties, indicating that the values are insensitive to differences in the underlying methods. Using the derived interaction parameters, activity models were formulated for the annite, phlogopite, eastonite, and siderophyllite components of biotite, and for the MgAl-celadonite component of muscovite. These were utilized for the empirical calibration of 45 fluid-independent equilibria involving unique combinations of phase components from the mineral assemblage garnet + plagioclase±biotite±muscovite±quartz. Forty-three of the equilibria may be applied as geobarometers to equilibrium assemblages of quartz + muscovite + biotite + garnet + plagioclase when care is taken to insure that applications are restricted to valid compositional ranges. For these, the calibrations yielded multiple correlation coefficients ranging from 0.953 to 0.998 and standard deviations of the residuals ranging from 597 to 118 bars.
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Berman RG (1988) Internally-consistent thermodynamic data for stoichiometric minerals in the system Na2O−K2O−CaO−MgO−FeO−Fe2O3−Al2O3−SiO2−TiO2−H2O−CO2. J Petro 29:445–522
Berman RG (1990) Mixing properties of Ca−Mg−Fe−Mn garnets. Am Mineral 75:328–344
Bucher-Nurminen K (1987) A recalibration of the chlorite-biotitemuscovite geobarometer. Contrib Mineral Petrol 96:519–522
Chatterjee ND, Flux S (1986) Thermodynamic mixing properties of muscovite-paragonite crystalline solutions at high temperatures and pressures, and their geological applications. J Petrol 27:677–693
Dyar MD (1990) Mössbauer spectra of biotite from metapelites. Am Mineral 75:656–666
Essene FJ (1982) Geologic thermometry and barometry. In: Ferry (ed) Characterization of metamorphism through mineral equilibria. Mineral Soc Am Washington DC Rev Mineral 10:153–206
Ferry JM (1980) A comparative study of geothermometers and geobarometers in pelitic schists from south-central Maine. Am Mineral 65:720–732
Fletcher CJN, Greenwood HJ (1979) Metamorphism and structure of the Penfold Creek area, near Quesnel Lake, British Columbia. J Petrol 20:743–794
Fuhrman ML, Lindsley DH (1988) Ternary-feldspar modeling and thermometry. Am Mineral 73:201–215
Ganguly J, Kennedy GC (1974) The energetics of natural garnet solid solution. Contrib Mineral Petrol 48:137–148
Ganguly J, Saxena SK (1984) Mixing properties of aluminosilicate garnets: constraints from natural and experimental data, and applications to geothermo-barometry. Am Mineral 69:88–97
Hodges KV, Spear FS (1982) Geothermometry, geobarometry and the Al2SiO5 triple point at Mt. Moosilauke, New Hampshire. Am Mineral 67:1118–1134
Hoisch TD (1989) A muscovite-biotite geothermometer. Am Mineral 74:565–572
Hoisch TD (1990) Empirical calibration of six geobarometers for the mineral assemblage quartz + muscovite + biotite + plagioclase + garnet. Contrib Mineral Petrol 104:225–234
Holdaway MJ (1971) Stability of andalusite and the aluminium silicate phase diagram. Am J Sci 271:97–131
Indares A, Martignole J (1985) Biotite-garnet geothermometry in the granulite facies: the influence of Ti and Al in biotite. Am Mineral 70:272–278
Koziol Am, Newton RC (1988) Redetermination of the anorthite breakdown reaction and improvement of the plagioclase-garnet-Al2SiO5-quartz geobarometer. Am Mineral 73:216–223
Massonne HJ (1981) Phengite: Eine experimentelle Untersuchung ihres Druck-Temperature-Verhaltens im System K2O−MgO−Al2O3−SiO2−H2O (in German). Unpublished Doctoral thesis, University of Bochum
Moecher DP, Essene EJ, Anovitz LM (1988) Calculation and application of clinopyroxene-garnet-plagioclase-quartz geobarometers. Contrib Mineral Petrol 100:92–106
Mueller RF (1972) Stability of biotite: a discussion. Am Mineral 57:300–316
Newton RC, Charlu TV, Kleppa OJ (1980) Thermochemistry of the high structural state plagioclases. Geochim Cosmochim Acta 44:933–941
Newton RC, Haselton HT (1981) Thermodynamics of the garnetplagioclase-Al2SiO5-quatz geobarometer. In: Newton RC, Navrotsky A, Wood BJ (eds) Thermodynamics of minerals and melts. Springer, New York Berlin Heidelberg pp 131–147
Perchuk LL (1970) Equilibria of rock-forming minerals. Nauka, Moscow
Perchuk LL, Zyrianov KK, Podlesskii, Kotelnikov AR, Aranovitch LY (1977) Excess mixing energies of minerals of variable composition. Phys Chem Min 3:301–307
Pigage LC (1982) Linear regression of sillimanite-forming reactions at Azure Lake, British Columbia. Can Mineral 20:405–421
Pigage LC (1976) Metamorphism of the Settler Schist, southwest of Yale, British Columbia. Can J Earth Sci 13:405–421
Powell R (1978) Equilibrium thermodynamics in petrology. Harper and Row, New York, 284 p
Powell R, Evans JA (1983) A new geobarometer for the mineral assemblage biotite-muscovite-chlorite-quartz. J Metamorphic Geol 1:331–336
Sevigny JH, Ghent ED (1989) Pressure, temperature and fluid composition during amphibolite facies metamorphism of graphitic metapelites, Howard Ridge, British Columbia. J Metamorphic Geol 7:497–505
Tracy RJ (1978) High grade metamorphic reactions and partial melting in pelitic schist, west central Massachusetts. Am J Sci 278:150–178
Velde B (1965) Phengite micas: synthesis, stability and natural occurrence. Am J Sci 263:886–913
Wones RD (1972) Stability of biotite: a reply. Am Mineral 57:316–317
Wones DR, Eugster HP (1965) Stability of biotite: experiment, theory and application. Am Mineral 50:1228–1227
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Hoisch, T.D. Equilibria within the mineral assemblage quartz + muscovite + biotite + garnet + plagioclase, and implications for the mixing properties of octahedrally-coordinated cations in muscovite and biotite. Contr. Mineral. and Petrol. 108, 43–54 (1991). https://doi.org/10.1007/BF00307325
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DOI: https://doi.org/10.1007/BF00307325