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2016-12-19 16:00
Prof. Julian Pearce
Julian Pearce is presently Professor Emeritus at the University of Cardiff (UK). He received a first class honours degree in Natural Sciences from the University of Cambridge (UK) in 1970 and obtained his PhD three years later from the University of East Anglia (UK). Before moving to Cardiff in 2000, he held posts at the Open University, Newcastle University and Durham University, all in the UK. His early work involved major field projects on ophiolites (Troodos and Oman) and arc magmatism (in the Chilean Andes). In 1985 and 1986, he took part in two Joint UK-Chinese Geotraverses across the Tibetan Plateau (Lhasa-Golmud and Lhasa-Kathmandu). He has also taken part in, and led, research cruises to many parts of the oceans, including the Mid-Atlantic Ridge and the back arc basins of Tonga, Japan and the Scotia Sea. He has taken part in a number of Ocean Drilling Expeditions, and was co-chief scientist on IODP Leg 125 (in 1988) and IODP Expedition 352 (in 2014) to the Izu-Bonin-Mariana-Forearc. He also has a background in geochemical analysis: before switching to Emeritus status, he ran a multi-instrument laboratory in Cardiff for the Geochemical Fingerprinting of Earth Materials. He is presently one of the world’s top-cited Earth Scientists with c. 36500 Google Scholar Citations (h=65; n=108) and is best known for his work on ophiolites, island arcs and the geochemical fingerprinting of rocks and minerals. His best-cited paper, on granite fingerprinting, presently has >6000 citations. He has received a number of awards, most recently (2014) the Murchison Medal from the Geological Society of London.
Ophiolite Complexes and their Modern Analogues

Ophiolite Complexes are fragments of oceanic lithosphere emplaced on land. They are important because they provide evidence for the age and distribution of past oceans, information needed for making past plate reconstructions and understanding Earth evolution. In his talk, Julian Pearce will demonstrate the use of geochemical fingerprinting for identifying the type of ocean basin in which a given ophiolite complex originated. He will also present new results from the recent IODP Expedition (352) to the Bonin Trench, in which he was Co-Chief Scientist. This expedition drilled oceanic crust formed in the Eocene at the start of subduction in the Western Pacific. Drilling, for the first time, in situ oceanic crust from this subduction initiation setting provides the opportunity to resolve one of the major controversies surrounding the origin of many of the world’s major ophiolites, including the Troodos Massif of Cyprus and the Semail Nappe in Oman.