Halogens and trace elements in subduction zones Von der Fakultät für Biologie, Chemie and Geowissenschaften der Universität Bayreuth zur Erlangung der Würde eines Doktors der Naturwissenschaften - Dr. rer. nat. - genehmigte Dissertation vorgelegt von Diego Bernini aus Pavia (Italien) Bayreuth, 2011 - 1 - - 2 - Table of contents SUMMARY ...............................................................................................................................................5 ZUSAMMENFASSUNG ...........................................................................................................................7 1. INTRODUCTION TO MASS TRANSFER IN SUBDUCTION ZONES.............................................9 1.1. STRUCTURE OF SUBDUCTION ZONES......................................................................................................9 1.2. FLUID PRODUCTION DURING SUBDUCTION ...........................................................................................11 1.3. FLUID MIGRATION PATHS IN SUBDUCTION ZONES.................................................................................13 1.4. PHASE EQUILIBRIA OF H O-BEARING SYSTEMS AT HIGH TEMPERATURE AND PRESSURE .........................15 21.5. FLUID COMPOSITION IN SUBDUCTION ZONES........................................................................................17 1.6. TRACE ELEMENT SIGNATURE OF SUBDUCTION FLUIDS..................