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Journal of the Geological Society; August 1983; v. 140; no. 4; p. 529-532; DOI: 10.1144/gsjgs.140.4.0529
© 1983 Geological Society of London
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Article

Fluids in metamorphism

Dr Michael Brown has provided the following Introduction to the published papers: Although geologists since the last century have acknowledged the importance of a fluid phase during many metamorphic processes, the symposium on 23 September was convened in the knowledge that the time was long overdue for a meeting at which specialists working on different aspects of metamorphic geology could discuss the central role of the fluid phase in metamorphism. The convenors had identified a number of important topics concerning the role of fluids in metamorphism and each of these was the subject of a keynote presentation, all of which are included as papers in this thematic set. The topics are: 'wet' versus 'dry' metamorphism, reviewed by Professor Alan Thompson; the role of fluid infiltration, a case study review by Professor John Ferry; the degree of oxygen isotope equilibration during metamorphism, a case study review by Dr Douglas Rumble, 111; and the role of fluid inclusion studies, a case study review by Professor Jacques Touret.There are a number of lines of evidence which support the idea of a volatile-rich fluid phase being present during metamorphism; however, the extent to which a free volatile-rich fluid phase is present, both in space and in time, is still a matter of some dispute. The evidence includes the common occurrence of tiny inclusions of fluid in the constituent mineral grains of metamorphic rocks and in the vein infills which commonly cut metamorphic rock complexes; such inclusions were recognized and described long ago by

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