EGU General Assembly 2008
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  Information - GMPV10 Source controls on granitoid geochemistry - evidences and mechanisms

Event Information
Since the 1970s, it has been recognised that the geochemical and isotopic characteristics of felsic plutonic and volcanic rocks (and by inference the magmas) at least partly reflect the compositions of the partially melted source rocks as well as the physicochemical conditions prevailing during magma genesis. Various highly simplified models were put forward to describe the possible relationships between source and magma compositions. However, these have proved unsatisfactory, especially in the light of recent developments in high-resolution (spatial and temporal) isotope analysis of granitic rocks, that have commonly revealed complex, multi-source contributions to the total magma systems, sometimes over protracted periods. Additionally, we recognise that the "sources" of felsic magma components may be derived from more than one level in the lithosphere (crust and mantle). This session is intended to explore the current state of knowledge about the nature and locations of material inputs into broadly granitic magma systems. Do we now think we know better how to understand the origins of source-related variations within granitic bodies and silicic volcanic systems?

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