Computer Science
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esrv...32..137c&link_type=abstract
Earth Science Reviews, Volume 32, Issue 1-2, p. 137-139.
Computer Science
Scientific paper
Fluid inclusions have been reported from all types of metamorphic rocks hence a free fluid phase must be present even at deep crustal levels. Mobile and chemically reactive fluids are thus available to transport both heat and matter through crustal rocks. The most important information gained from fluid inclusion studies is a detailed knowledge of the composition of the fluid phase(s) present during metamorphism. Early studies drew attention to the presence of variable and sometimes highly saline aqueous brines in most metamorphic environments as well as CH4 in low grade rocks and CO2 at higher grades. Subsequently the role played by brines in expanding the unmixing solvus of the aqueous and carbonic components of common metamorphic fluids to cover a wide P T range has been emphasized. Metamorphic petrologists have only slowly adapted their thermodynamic models for metamorphic equilibria to these data. More recently, studies have demonstrated that N2 is a common phase especially in late or lower temperature fluids. Little is known of the role of nitrogen in the solid phases involved in metamorphism. Do the high nitrogen contents observed in some fluids reflect a significant nitrogen component in the minerals in those rocks? Or do processes related to the compositional evolution of the fluid phase act to concentrate nitrogen in later stage fluids?
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