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Information - GMPV4 Mantle metasomatism in intra-plate and suprasubduction settings
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Event Information |
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The definition of 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 for approaching the question of mantle composition and homogeneity versus heterogeneity. This goes together with the concept of mantle reservoirs and their relationships with recycling of subducted material or with plume influx from the deep Earth. In this respect several points may be addressed by this session, 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 definition of geochemical signatures of fluids/melts migrating through the mantle in both anorogenic and orogenic settings, these latter being much less understood than the former due to the scarcity of mantle xenoliths entrained in calc-alkaline (s.l.) lavas;
- 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.
The direct investigation of mantle xenoliths, or larger mantle occurrences such as alpine, abyssal and ophiolitic peridotites which allow a physical observations of mantle material at various scale, is welcome, as well as the backward approach using primary magma compositions which allow to constraint the chemical features of the mantle source on a much global scale.
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