Empirical phengite geobarometer: Background, calibration, and application

Kamzolkin, Vladimir; Иванов, С. Д.; Konilov, A. N.

doi:10.1134/s1075701516080092

Cited by 16 publications

(15 citation statements)

References 31 publications

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“…Multiple conventional thermobarometers were utilized to constrain metamorphic P-T conditions to compare with predictions from modeling trials, including garnet-clinopyroxene thermometry (Powell 1985;Ravna 2000), garnet-phengite thermometry (Green and Hellman 1982), garnet-omphacite-phengite geobarometry (Waters and Martin 1996), phengite geobarometry (Kamzolkin et al 2016), and muscovite-paragonite thermobarometry (Guidotti et al 1994;Roux and Hovis 1996) (presented in Section 5.2).…”

Section: Thermobarometry Methodsmentioning

confidence: 99%

“…An empirical correction of -0.000543 is added to the original T*lnK coefficient (0.002995) to account for the discrepancy with the experiments of Schmidt (1993) (see Section 1.4 Garnet-Omphacite-Phengite Geobarometer (GOP) in supplementary materials). Another empirical phengite geobarometer (Kamzolkin et al 2016) for conditions of Si >3.25 p.f.u. and T <750 °C was used in this study to compare with the GOP barometer (see Section 1.5 phengite geobarometer in supplementary materials).…”

Section: Thermobarometry Methodsmentioning

confidence: 99%

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Thermodynamic modeling of high-grade metabasites: a case study using the Tso Morari UHP eclogite

Pan

Macris

Menold

2020

Contrib Mineral Petrol

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Highlights1. Eclogite from the Tso Morari UHP terrane is used as a representative metabasite to test the efficacy of various thermodynamic modeling protocols.2. User's choice of modeling program, version, and thermodynamic database, have little effect on the model's outcome in terms of predicted stable mineral assemblage and P-T path. However, the choice of garnet solution model can have a significant effect on pressure predictions.3. Bulk compositions measured by XRF do not represent the reactant or effective bulk composition at the time of garnet nucleation and throughout garnet prograde growth.Taking into account calculations of the effective bulk composition of the system _______________________________________________

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Section: Thermobarometry Methodsmentioning

confidence: 99%

Section: Thermobarometry Methodsmentioning

confidence: 99%

Thermodynamic modeling of high-grade metabasites: a case study using the Tso Morari UHP eclogite

Pan

Macris

Menold

2020

Contrib Mineral Petrol

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“…Table 5. Mean calculated values of pressure for temperature of 600 ± 40 • C using the phengite Si-content barometry of [30]. The omphacite inclusions in pyrite and chalcopyrite are similar in composition to omphacite from eclogite bodies exposed in the Red Cliff area of the Greater Caucasus (Figure 6), the geothermobarometry of which yielded conditions of 680 ± 40 • C and minimum pressure of 1.6 ± 0.2 GPa [23].…”

Section: P-t Estimatesmentioning

confidence: 96%

“…According to published data, the temperature of metamorphism of the schists of the Armovka Formation is estimated at 600 ± 40 • C using the garnet-biotite Fe−Mg exchange thermometer [23]. We performed calculations using the phengite Si-content barometer of [30] ( Figure 7). The pressure was calculated for temperatures from 560 to 640 • .…”

Section: P-t Estimatesmentioning

confidence: 99%

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Sulfides in Metamorphic Rocks of the Fore Range Zone (Greater Caucasus). A New Type of Mineral Container for Peak Metamorphism Mineral Assemblages

et al. 2019

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The rocks of the Armovka Formation (the Fore Range zone, Greater Caucasus) have undergone low-grade metamorphism that partially erased information about initial rock formation conditions. We discovered high-pressure mineral inclusions such as omphacite, phengite, garnet, and paragonite enclosed by pyrite and chalcopyrite. Mineral inclusions in sulfides may provide important information about metamorphic pressure−temperature conditions because they are shielded by the host minerals and isolated from significant low-grade overprinting. Calculations performed on phengite inclusions using the phengite Si-content barometry indicate a pressure ranging from 1.7 ± 0.2 to 1.9 ± 0.2 GPa for temperature of 600 ± 40 °C. These data are consistent with estimations obtained for eclogite bodies embedded in rocks of the Armovka Formation. Geothermobarometry of the latest yielded conditions of 680 ± 40 °C and a minimum pressure of 1.6 ± 0.2 GPa to upper pressure boundary at 2.1 GPa. This fact allows us to assume that the metamorphic rocks of the Armovka Formation were immersed in the subduction zone to the conditions of the eclogite facies of metamorphism, forming a coherent subduction complex together with eclogites.

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Tracing exhumation record in high-pressure micaschists: A new tectonometamorphic model of the evolution of the eastern part of the Fore Sudetic Block, Kamieniec Metamorphic Belt, NE Bohemian Massif, SW Poland

Szczepański¹,

Goleń²

2022

Geochemistry

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Empirical phengite geobarometer: Background, calibration, and application

Cited by 16 publications

References 31 publications

Thermodynamic modeling of high-grade metabasites: a case study using the Tso Morari UHP eclogite

Thermodynamic modeling of high-grade metabasites: a case study using the Tso Morari UHP eclogite

Sulfides in Metamorphic Rocks of the Fore Range Zone (Greater Caucasus). A New Type of Mineral Container for Peak Metamorphism Mineral Assemblages

Tracing exhumation record in high-pressure micaschists: A new tectonometamorphic model of the evolution of the eastern part of the Fore Sudetic Block, Kamieniec Metamorphic Belt, NE Bohemian Massif, SW Poland

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