Fluid inclusions in high pressure and ultrahigh pressure metamorphic rocks
Published:January 01, 2003
Jacques L.R. Touret, Maria-Luce Frezzotti, 2003. "Fluid inclusions in high pressure and ultrahigh pressure metamorphic rocks", Ultrahigh Pressure Metamorphism, Dennis A. Carswell, Roberto Compagnoni, Franco Rolfo
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Fluid-rock interaction occurs at all steps of metamorphic evolution. Most metamorphic reactions, in fact, involve volatiles - aqueous for hydroxyl-bearing minerals, carbonic for carbonates. The determination of the P–T conditions of trapping and of the precise chemical composition of these fluids has always been a major problem of metamorphic petrology. Many methods are possible, mainly based on experimental or indirect approaches (e.g. thermodynamic modelling, experimental mineral reactions, stable isotopes etc.). Fluid inclusion studies (e.g. Roedder, 1984) represent a possible direct way to study fluids trapped at high P and T.
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Ultrahigh Pressure Metamorphism
This is the first volume in this series dealing with a petrological subject and contains the contributions of the lectures given at the 5th School of the European Mineralogical Union (EMU) on “Ultrahigh Pressure Metamorphism” held in Budapest from 21 to 25 July 2003. The topic of UHPM was selected because this extreme type of metamorphism, initially considered as a petrographic oddity by the geologic community, has now become recognised as a normal feature of continental plate collisional orogens and important to understanding just how deep the upper part of the continental lithosphere can subduct. We note that this School took place just twenty years from the first report by Christian Chopin of coesite in exposed orogenic metamorphic rocks of the continental crust. The lectures given at this school benefited by the scientific results of the research promoted by the ILP Task Groups III-6 and III-8, active on UHPM from 1994 to 1998 and 1999 to 2004, respectively, and published in a number of monographs and special issues of international journals. It is our strong belief that this petrologic topic should be recognised to be of paramount importance in the education of students and young researchers in Earth Science.