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Information - GMPV19 Subduction vs intraplate lithospheric mantle: agents and processes
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Event Information |
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Understanding the nature of fluids/melts migrating through the mantle and the processes responsible for its chemical and mineralogical modifications are essential among Earth's scientists to approach the question of mantle composition and homogeneity versus heterogeneity. This goes together with the concept of mantle reservoirs and their relationships with element recycling by subduction material or by plume influx from the deep Earth. In this respect this session aims to address several key points, which are, among many others, as follow:
- the evolution of mantle through time, which allow to define the "starting" composition on which depletion and/or enrichement processes can be identified;
- the nature and geochemical signatures of fluids/melts migrating through the mantle in both anorogenic and orogenic settings. Due to the scarcity of mantle xenoliths representative of the latter context, emphasis is given to high and very high pressure rocks witnessing the deep fluid-melt-mantle interactions, as well as to mantle xenoliths brought to the surface by calc-alkaline lavas in clear orogenic environments;
- the relationships between recycled material, metasomatism and geochemical components;
- the role and extension of mantle plumes and mantle convection, and their ability to entrain and homogenise different mantle lithologies.
Direct case-studies of mantle xenoliths, or larger mantle exposures such as alpine, abyssal and ophiolitic peridotites enabling the physical observation of mantle material at various scale is welcome, as well as the backward approach using primary magma compositions to achieve constraints on the chemical features of the mantle source on a much global scale. Finally results of experimental studies focusing on upper mantle composition and processes are also more than welcome
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Preliminary List of Solicited Speakers |
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E-R.Neumann, H.Marshall, B.G.J.Upton, P.Ulmer, R.Maury, M.Memzies, S.Arai, C.Hawkesworth, S.Y.O'Reilly, B.Griffin, N.Pearson, G.Brey
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 Back to Session Programme
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