High-grade metamorphism, dehydration and crustal melting: A reinvestigation base don new experiments in the silica-saturated portion of the system KAIOsub2-MgO-SiOsub2-Hsub2O-Cosub2 at P< 1.5 GPa

Article Abstract:

Th KAIOsub2-MgO-SiOsub2-Hsub2O-Cosub2 system is a model for the processes of granulite-facies metamorphism, representing the simplest model for stability of biotite in subaluminous and metaluminous, quartz-saturated crustal rocks. There has been much controversy over the role of carbon dioxide in metamorphism and partial melting. New experiments have been performed, and findings show that the univariant reaction Ph1 + Qtz + F1 = En + Sa + melt is nearly coincident with the fluid-absent reaction in the COsub2 free subsystem.

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Very low grade metamorphism of the Taveyanne formation of western Switzerland

Article Abstract:

Electron microprobe analysis, stable isotope analysis, fluid inclusion thermometry, and coal rank, illite and chlorite crystallinity calculations were undertaken to determine metamorphic conditions of the Taveyanne formation of western Switzerland. Electron microprobe analyses for actinolite, epidote, phengite, chlorite, phrenite, pumpellyite, titanite and laumontite are presented.

Usage, Diagnosis, Electron microscopic

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Melt production during granulite-facies anatexis: experimental data from 'primitive' metasedimentary protoliths

Article Abstract:

Fluid-absent partial melting experiments were undertaken at 0.5 and 1.0 GPa in the 750 to 1000 degrees C temperature range, to determine Mg and the effects of TiOsub2 on the granulite-grade anatectic evolution of magnesian metapelites and metagrewackes. Solidus temperatures in both rock types rose with increasing Mg, but were not affected by the presence or absence of TiOsub2.

Physiological aspects, Mineralogical research, Granulite, Melting points, Melting

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