Chemical Transport in Metasomatic Processes

As indicated on the title page, this book is an outgrowth of the NATO Advanced Study Institute (ASI) on Chemical Transport in Metasomatic Processes, which was held in Greece, June 3-16, 1985. The ASI consisted of five days of invited lectures, poster sessions, and discussion at the Club Poseidon near Loutraki, Corinthia, followed by a two-day field trip in Corinthia and Attica. The second week of the ASI consisted of an excursion aboard M/S Zeus, M/Y Dimitrios II, and the M/S Irini to four of the Cycladic Islands to visit, study, and sample outstanding exposures of metasomatic activity on Syros, Siphnos, Seriphos, and Naxos. Nine­ teen invited lectures and 10 session chairmen/discussion leaders participated in the ASI, which was attended by a total of 92 professional scientists and graduate stu­ dents from 15 countries. Seventeen of the invited lectures and the Field Excursion Guide are included in this volume, together with 10 papers and six abstracts representing contributed poster sessions. Although more than two years has elapsed since the ASI, all of the papers in this volume are up to date, and each has benefited from stimulating discussion, critical comment, and scientific interaction, both at the ASI and in the subsequent peer review process. The scientific emphasis of the ASI focused initially on upper mantle metasoma­ tism and crust/mantle interaction. Isotopic evidence was presented indicating that upper mantle peridotites have undergone nonequilibrium metasomatic exchange with an external oxygen-bearing fluid.

Inhalt

Invited Lectures.- 18O/16O Evidence for Fluid-Rock Interaction in the Upper Mantle: Data from Ultramafic Nodules and K-Rich Volcanic Rocks in Italy.- Fluid Transport and Metasomatic Storage in the Mantle.- Metasomatism of the Continental Lithosphere: Simulation of Isotope and Element Abundance Behaviour and Case Studies.- Fluid Inclusions and Pressure-Temperature Estimates in Deep-Seated Rocks.- Advective Metasomatism.- Metasomatism Involving Fluids in CO2-H2O-Nacl.- Fluid Exchange between Reacting Bodies of Rock.- A Simple Thermodynamic Model for Grain Interfaces: Some Insights on Nucleation, Rock Textures, and Metamorphic Differentiation.- Application of Moderation Theorems to Metasomatic Processes.- Induced Stress and Secondary Mass Transfer: Thermodynamic Basis for the Tendency Toward Constant-Volume Constraint in Diffusion Metasomatism.- Pre- or Synmetamorphic Metasomatism in Peraluminous Metamorphic Rocks?.- Aluminum Speciation in Metamorphic Fluids.- Controls of the Chemical Composition of Geothermal Waters.- Metasomatism in Iceland: Hydrothermal Alteration and Remelting of Oceanic Crust.- Evolution of the Cycladic Crystalline Complex: Petrology, Isotope Geochemistry, and Geochronology.- Tectonic Evolution of the Cycladic Blueschist Belt (Aegean Sea, Greece).- Metamorphic Events in the Cyclades and their Associated Fluids.- Excursion Guide.- Excursion Guide to the Field Trip on Seriphos, Syros, and Naxos.- Contributed Poster Sessions - Papers.- Lagrangian and Eulerian Representations of Metasomatic Alteration of Minerals.- A Two-Stage, Transient Heat and Mass Transfer Model for the Granodiorite Intrusion at Seriphos, Greece, and the Associated Formation of Contact Metasomatic Skarn and Fe-ore Deposits.- Hydrothermal Alteration of a Variscian Granite, Magmatic Autometasomatism and Fault Related Vein Metasomatism.- A Model for Fluids in Metamorphosed Ultramafic Rocks: IV. Metasomatic Veins in Metaharzburgites of Cima Di Gagnone, Valle Verzasca, Switzerland.- Some Calculations Pertaining to an Integrated Chemical and Stable-Isotope Model of the Origin of Mid-Ocean Ridge Hydrothermal Systems.- Transition Metal Mobility in Oceanic Ridge Crest Hydrothermal Systems at 350°C-425°C.- Ca-K Metasomatism in the System CaO-K2O-MgO-Al 2O3-SiO2-H2O and Skarn Formation in Pelitic Rocks.- Geochemistry of Greisenized Granites and Metasomatic Schist of Tungsten-Tin Deposits in Portugal.- Tennahedrite Thermochemistry and Metal Zoning.- Prediction of the Thermodynamic Behavior of Aqueous Silica in Aqueous Complex Solutions at Various Temperatures.- Contributed Poster Sessions - Abstracts.- Sulfide Solubilities in Buffered Systems from 400 to 600°C and 0.5 to 2 Kb and Depositional Implications.- Diffusion and/or Plastic Deformation around Fluid Inclusions in Synthetic Quartz.- Hydrogen Metasomatism in Geothermal Fields: A Geothermometric Approach Involving Fluids and Mineral Compositions.- Pressure-Temperature and Evolution of Fluid Compositions of Al2SiO5-Bearing Rocks, Mica Creek, British Columbia, in Light of Fluid Inclusion Data and Mineral Equilibria.- The Composition of Hydrothermal Fluids Responsible for Silicate Reaction Veins in Dolomitic Marbles.- Distribution of Beryllium in Rocks from the SN-W Granite of Regoufe, N. Portugal.