Information - GMPV5 The origin of the slab component in island arcs: H2O-rich fluid or melt – who delivers the goods?
There is a consensus in the geoscience community that arc magmatism has a distinct chemical signature due to the addition of certain trace elements (e.g. Li, B, LILE, LREE) carried by slab-derived agents. What has yet to be established are the mechanisms by which these elements are transported from sources within the slab into the overlying wedge, and how fluids or melts -- or both -- are related to this process. Current debate centers on whether melts are the main or even sole agent responsible for the mobilization of the required amounts of trace elements. Some studies suggest that hydrous fluids are sufficiently reactive to scavenge these elements in open systems. Also under discussion are the subducted sediments, which are thought to be an important trace element source. Confirming or contradicting these claims will place first order constraints on the thermal structure of subduction zones. In this session we will address these issues by bringing together experimental and metamorphic petrologists, geochemists, geophysists, and modelers.
Preliminary List of Solicited Speakers
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