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• W2014142135 abstract "The phenomenon of migmatization was studied in Precambrian metavolcanic gneisses of calc-alkaline chemistry, outcropping along a prograde amphibolite/granulite facies transition in the West Uusimaa Complex of SW Finland. This paper discusses one of the studied gneiss levels (a garnet-bearing Qtz/Plag/Ksp/Bio-gneiss) which was observed to transsect the metamorphic isograd pattern at almost right angle. The gneiss was studied for structures, whole-rock chemistry (major, trace and REE), mineral content, microtextures, plagioclase anorthite content and fluid inclusions. Data concerning the latter four subjects are presented. Migmatization proved to: (1) have occurred parallel to compositional banding of the rocks; (2) have produced identical leucosome/melanosome/mesosome mineral parageneses; (3) have initiated feldspar/garnet-poikiloblasthesis (and occasionally biotite porphyroblasthesis) in leucosome, and biotite-/garnet-poikiloblasthesis in melanosome; (4) have caused entrapment of unstrained quartz blebs carrying isolated (primary) two-phase pure H2O fluid inclusions of unique filling degree range in the above-mentioned feldspar- and garnet-poikiloblasts; (5) have occurred post-D1/pre-D2, synchronous to amphibolitefacies metamorphism, in the subsolidus regime; (6) have been affected by D2 in the way of localized mylonitization of the melanosome, and quartz migration (exudation) from adjacent mesosome into leucosome; and (7) have had some control by the biotite content of the original compositionally banded rock. Initial leucosome formation appears to have been controlled by the pre-leucosome biotite content: the recalculated modal biotite content of the leucosome/melanosome combination conspicuously is in the range of 5–20 vol.% of biotite. Final extent of the leucosome shows on its turn a marked correlation with mesosome modal biotite content. Because leucosomes occur carrying a recalculated modal biotite content equalling adjacent mesosome biotite content, a second factor is held responsible for the onset of migmatization in the buried and sheared rock: deficient water balance. Migmatization, initiated at PT conditions fit for feldspar recrystallization and almandine formation, was induced during prograde metamorphism to cancel an established zonation in water pressure or water content parallel to compositional banding. Zones of low PH2O or wt.% H2O thereby were converted into leucosomes, while zones of higher PH2O or wt.% H2O remained unaffected (and became mesosome). That XH2O did not vary at the onset of migmatization is recorded in the isolated pure H2O fluid inclusions contained in the quartz blebs enclosed in the studied leucosome- and melanosome-poikiloblasts. Restore of water balance (either by internally controlled factors or externally introduced ones) halted migmatization and its obliteration of compositional banding." @default.
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• W2014142135 date "1988-07-01" @default.
• W2014142135 modified "2023-10-14" @default.
• W2014142135 title "Subsolidus migmatization in high-grade meta-tuffs (Kurkijärvi, southwest Finland)" @default.
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• W2014142135 doi "https://doi.org/10.1016/0024-4937(88)90032-1" @default.
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