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A Fractionation Model for Hydrous Calc-Alkaline Plutons and the Heat Budget During Fractional Crystallisation and Assimilation

  • Luzius Matile
  • Alan Bruce Thompson
  • Peter Ulmer
Chapter
Part of the Petrology and Structural Geology book series (PESG, volume 11)

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%).

Key words

hydrous magma thermal models fractional crystallisation assimilation calcalkaline batholith fractionation model hydrous and anhydrous melting 

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Copyright information

© Springer Science+Business Media Dordrecht 2000

Authors and Affiliations

  • Luzius Matile
    • 1
  • Alan Bruce Thompson
    • 1
  • Peter Ulmer
    • 1
  1. 1.Departement für ErdwissenschaftenETH ZürichSwitzerland

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