Abstract
A fractionation model has been developed for differentiation of a hydrous mantle magma. As examples of such primitive melts from successive quenched fractionates of high temperature magma batches dyke rocks cross cutting the calc-alkaline batholith of the Adamello pluton have been utilised here. The heat budget during fractionation of these magmas has been evaluated from available thermodynamic data and a generalised phase diagram. Various thermal evolution paths have been calculated in terms of assimilation behaviour of different crustal rocks. The potential for assimilation of fertile crustal rocks by later fractionates, e.g., gabbro (basalt to basaltic — andesite volcanic equivalents) is much smaller (max. 30–40% equivalent mass) compared to picrite (up to 80%).
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Matile, L., Thompson, A.B., Ulmer, P. (2000). A Fractionation Model for Hydrous Calc-Alkaline Plutons and the Heat Budget During Fractional Crystallisation and Assimilation. In: Bagdassarov, N., Laporte, D., Thompson, A.B. (eds) Physics and Chemistry of Partially Molten Rocks. Petrology and Structural Geology, vol 11. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4016-4_6
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DOI: https://doi.org/10.1007/978-94-011-4016-4_6
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