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Michel Grégoire

Michel Grégoire

Laser Ablation,  Mantle Metasomatism,  Mineralogy And Petrology : Igneous Petrology,  Icpms,  Geochemistry : Major And Trace Element Geochemistry,  Mantle Xenoliths,  Magmatic Rocks
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Rosalba Bonaccorsi

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Michel GREGOIRE

Discipline: Earth Science
Observatoire Midi Pyrénées, Toulouse, France

Summary

Senior Scientist CNRS
Head of the laboratory Geosciences Environnement Toulouse
Ph-D thesis (1994)
HDR (2000)

I have broad interests in petrology, mineralogy and geochemistry, with my greatest enthusiasm being in the study of ultrabasic and basic rocks from lower crustal and mantle domains. I am currently undertaking collaborative work on petrological and geochemical studies of ultrabasic and basic rocks from other areas in the world (Patagonia, Kerguelen Islands, Philippines, French Massif Central, Poland, Algeria, Oman, California, Cameroon and South Africa). All these studies are focusing on the nature and evolution of the various metasomatic melts percolating the oceanic and sub-continental upper mantle both in intraplate and subduction zone settings through a detailed analyses of the major and trace element contents both in bulk rocks and minerals using electron microprobe and solutions and laser ICP-MS techniques (I am a specialist of these techniques). A particular aim of these studies is to look at the residency of the trace elements in the upper mantle and lower crustal rocks and to calculate the inter-mineral partition coefficients in these natural mantle and lower crustal samples. In a near future I am going to study ultramafic and mafic rocks occurring in other type of occurrences such as the ophiolites, the orogenic lherzolite massifs and the deep layered intrusions.
The final goal of all these studies is to better constrain and better understand the nature and the evolution of the lower crust and the upper mantle in various settings and in particular to better understand the nature and evolution of the crust-mantle boundary and the chemical exchanges taking place between these two major earth reservoirs.

Experience

Post-doctoral fellow November 1999 - October 2001

Cape Town University (Cape Town ZA)

Petrological study of mantle xenoliths from south african kimberlites

Post-doctoral fellow June 1996 - October 1999

Macquarie University (Sydney AU)

Petrological study of lower crustal and upper mantle xenoliths from Kerguelen Archipelago and Papua-New Guinea

Education

HDR Since June 2000

University Toulouse III (Toulouse FR)

Petrology, Mineralogy and Geochemistry of the deep lithosphere (lower crust and upper mantle) Key words: Petrology, Ultramafic-mafic xenoliths, Ophiolites, Peridotites, Gabbros, Oceanic granulites, Cumulates, Magmatism, Mantle Metasomatism, Underplating processes, Crustal thickening, Continental nucleii,

Ph-D September 1989 - February 1994

University of St Etienne (St Etienne FR)

Study of the mantle and lower crustal xenoliths from Kerguelen Archipelago (France, Indian Ocean)

Awards

A. Lacroix Prize June 1994

Conferred by the French Society of Mineralogy and Crystallography

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