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Information - GMPV17 Magmatic differentiation: theory, experiments, and examples
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Event Information |
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Magmas provide one of the most important probes of the interior of the Earth. Chemical information locked in plutonic or volcanic rocks (solidified magma) can, in principle, be used to ascertain the compositions of the source from which the magma was originally formed and the physical conditions of melt generation. However, in all but a few cases, the compositions of magmas change as they ascend through the lithosphere in response to differentiation processes such as fractional crystallisation, crustal contamination and mixing with other magmas. Recognising that the crystalline and glassy components within the rock do preserve a record of these differentiation processes, we can use classic and modern analytical techniques, experimental petrology, and theoretical modelling, to unravel the differentiation history of plutons and volcanoes. This not only gives us a means of accounting for the effects of differentiation and constraining the nature of the original magma source(s), but also a way of quantifying the mechanisms and elemental fluxes associated with such processes. This session seeks to bring together researchers that are aiming to unravel differentiation processes by applying methodologies such as crystal isotope stratigraphy, classic and experimental petrology, geochronology, geochemistry, and modelling to quantify fractional crystallisation versus magma-crust interaction or mixing processes and constrain their respective time-scales.
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