Objective
This project is an integrated study of varying P-T conditions, deformation phases and fluid regime evolution of polymetamorphic terrains. Mineral thermobarometry and fluid inclusion studies reveal that most metamorphic rocks, in particular granulite-facies rocks, bear record to different metamorphic stages in varying mineral compositions and different generations of fluid inclusions. In this probe microanalysis, solid and fluid phase thermobarometry, cryothermometry, laser Raman spectroscopy and micro-PIXE analysis of fluid inclusions will be carried out. Detailed studies of phase equilibria, mineral activity-composition and metamorphism-deformation relationships accompany the investigations.
Four major research items are to be addressed: the equilibration problem in polyphase metamorphic rocks, the influence of deformation, diffusion and resetting in various mineral parageneses during changing P-T conditions and fluid regimes, and consequently the usefulness and reliability of obtained mineral and fluid inclusion data for P-T estimates; use, evaluation and extension of thermodynamically consistent data sets and/or individual thermobarometers; estimation of p-H2O and f-O2 using newly prepared mineralogical sensors; and determination of fluid inclusion compositions and density in combination with p-H2O and f-CO2 estimates, and determination of salt components.
The ultimate goal of the project is to establish a quantitative basis to estimate relationships between P-T-t-d-f (fluid) conditions of metamorphism and geodynamic modelling of the lower crust.
The following results are expected: P-T-t-d paths and fluid regime will be established for polymetamorphic granulite terrains of the ancient cratons and mobile belts of the Baltic and Indian shields; mineral sensors will be developed to estimate partial water pressure (p-H2O), (biotite-orthopyroxene, K-feldspar, quartz barometer) and oxygen fugacity (f-O2) (hemoilmenite barometer); a new version of the multipurpose computer programme (TPF-programme) will be written; and a quantitative basis will be created to estimate relationships between P-T-t-d-f conditions of metamorphism and geodynamic environments of the lower crust. Results will be published jointly in well-known journals and will be presented at international conferences.
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1081 HV Amsterdam
Netherlands