"From the Solar Nebula to the Deep Earth – a Geological Journey"
Professor Bill Griffin
Distinguished Professor of Geochemistry, Macquarie University
Date: Thursday 6th August, 5.45pm
Venue: Building Y3A, Theatre 1, Macquarie University
Bill will tell the story of the journey to the surface of the remarkable rocks of Southern Tibet. These are large fragments of the Earth’s mantle that originate from very great depths (>500 km down) under extreme conditions not ordinarily expected within the mantle and which play an important role in the evolution of igneous systems. To learn the story of these remarkable rocks, we have to understand both the mechanisms that have brought them up to the surface, and the origins of these super-reducing conditions in the mantle. This has involved field studies, geodynamic modeling, a range of techniques for micron-scale chemical, microstructural and isotopic analysis, and a bit of good luck. One of the keys to the Tibetan riddles lies near the Sea of Galilee in Israel, and involves a remarkable, still poorly-understood type of volcanic activity. Bill will lead you through this story, which is still evolving by the day; it illustrates the diversity of approaches required in modern geological research, and some of the excitement of that research work.
Bill Griffin is Distinguished Professor of Geochemistry at Macquarie University and Program Director at the RC Centre of Excellence for Core to Crust Fluid Systems. Before that he spent 20 years at the University of Oslo, mainly in the Geological Museum, which is the centre of geochemical research in Scandinavia. He moved to Australia in 1985, to be with his Aussie wife and to help develop geological applications for the CSIRO’s new proton microprobe. In 2006 he left the CSIRO and moved to Macquarie University.