SE15
Accessory Minerals: Occurrences, Compositions, Geochronology, Provenance and Petrogenesis

Main Organiser
Paul W. O. Hoskin, Albert-Ludwigs-Universitaet Freiburg, IMPG,
Albertstr. 23 b, D-79104 Freiburg, Germany
paul.hoskin@minpet.uni-freiburg.de

Co-Organiser(s)
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Brief Description
Accessory mineral occurrences and compositions are increasingly studied in crustal evolution investigations. They are host to a range of important isotopes and trace-elements and provide important constraints on the age and petrogenesis of host rocks. Recent contributions to the study of accessory minerals include the determination of zircon age spectra in sedimentary rocks, the formation of silicate and phosphate phases by net-transfer reactions during metamorphism, and the role of REE-rich accessory saturation and fractionation during magma differentiation. Accessory minerals are also important in fields ranging from hydrology and the composition of ground waters, ceramics and radioactive waste disposal. In the Asia-Oceania region, accessory phases including zircon, apatite and the epidote-group minerals have been indispensable to investigations such as Himalayan tectonics, the Archaean geology of Australia, the petrogenesis of southeast Asian gem occurrences, and t! he nature and tectonics of the eastern Gondwana margin. This session will bring together geologists, geochronologists and geochemists who research within the sometimes disparate fields of tectonics, geochronology, mineralogy and petrology.