| Reference Type | Journal (article/letter/editorial) |
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| Title | Geothermometry and geobarometry of high-grade rocks: a case study on garnet-pyroxene granulites in southern Sri Lanka |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Faulhaber, S. | Author |
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| Raith, M. | Author |
| Year | 1991 (March) | Volume | 55 |
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| Issue | 378 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_55/55-378-33.pdf+ |
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| DOI | doi:10.1180/minmag.1991.055.378.04Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1692 | Long-form Identifier | mindat:1:5:1692:0 |
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| GUID | 0 |
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| Full Reference | Faulhaber, S., Raith, M. (1991) Geothermometry and geobarometry of high-grade rocks: a case study on garnet-pyroxene granulites in southern Sri Lanka. Mineralogical Magazine, 55 (378) 33-56 doi:10.1180/minmag.1991.055.378.04 |
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| Plain Text | Faulhaber, S., Raith, M. (1991) Geothermometry and geobarometry of high-grade rocks: a case study on garnet-pyroxene granulites in southern Sri Lanka. Mineralogical Magazine, 55 (378) 33-56 doi:10.1180/minmag.1991.055.378.04 |
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| In | (1991, March) Mineralogical Magazine Vol. 55 (378) Mineralogical Society |
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| Abstract/Notes | AbstractIn the central granulite belt of Sri Lanka, garnet-pyroxene granulites of granitic and gabbro-noritic composition are the most abundant rock types. The micro-structures and mineral chemistry data prove complete attainment of textural and large-scale chemical equilibrium during and following a phase of extreme penetrative deformation at conditions of the granulite facies (800–850 °C, 5 to 9 kbar). On a local scale, especially along the intergranular system, continued cation exchange decoupling from the early ceasing net-transfer reactions destroyed the near-peak metamorphic equilibrium. The extreme compositional variation of the coexisting ferro-magnesian phases (Fe/(Fe + Mg): gar 0.98−0.65, opx 0.92−0.40, cpx 0.88−0.28) and the near-isothermal conditions of equilibration throughout the studied area enabled examination of the effects of non-ideal mixing in garnet and pyroxenes on the equilibrium constants of reactions used in geothermobarometry, and tests on the quality of commonly applied thermometers/barometers and the validity of activity models adopted in the calibrations. The Sri Lankan data set reveals more or less pronounced compositional dependences for all of the tested gar-opx/gar-cpx Fe-Mg exchange thermometers and the opx + plg ⇌ gar + qtz barometers. Evidently the recommended solution models do not adequately describe the mixing properties of the involved ferro-magnesium mineral phases (garnet, orthopyroxene and clinopyroxene). |
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