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Janet Margaret Hergt is an Australian geochemist. She is a Redmond Barry Distinguished Professor in the School of Earth Sciences at the University of Melbourne, Victoria, Australia. The main focus of her research has been in the chemical analysis of rocks and minerals to explore the exquisite record of Earth processes preserved within them. Hergt is best known for her geochemical investigations of magmatic rocks although she has employed similar techniques in interdisciplinary projects including areas of archaeological and biological science.