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Mixing between chemically variable primitive basalts creates and modifies crystal cargoes.

David A Neave1,2, Philipp Beckmann3, Harald Behrens3

  • 1Department of Earth and Environmental Sciences, The University of Manchester, Manchester, UK. david.neave@manchester.ac.uk.

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Mixing chemically variable basaltic magmas creates crystal cargoes by unlocking plagioclase-rich mushes and driving resorption. This process, driven by melt diffusion, alters phase equilibria and crystal growth in primitive lavas.

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Area of Science:

  • * Volcanology and igneous petrology.
  • * Geochemistry and mantle processes.

Background:

  • * Basaltic crystal cargoes record mantle chemical variability erased by magma mixing.
  • * Consequences of mixing chemically variable primitive magmas are poorly understood.
  • * Disequilibrium in erupted crystal cargoes indicates complex mixing histories.

Purpose of the Study:

  • * Investigate crystal cargo response to mixing-induced disequilibrium in primitive magmas.
  • * Utilize magma-magma reaction experiments on Icelandic lava analogues.
  • * Determine the role of major element diffusion in altering phase equilibria.

Main Methods:

  • * Performed magma-magma reaction experiments.
  • * Used analogues of primitive Icelandic lavas from distinct mantle sources.
  • * Analyzed chemical variability and phase equilibria in experimental products.

Main Results:

  • * Major element diffusion in melt is the dominant control on chemical variability.
  • * Diffusion alters phase equilibria, triggering plagioclase resorption.
  • * Resorption occurs in regions initially saturated with plagioclase.

Conclusions:

  • * Isothermal mixing of variable basaltic magmas significantly modifies crystal cargoes.
  • * Mixing unlocks plagioclase-rich mushes, driving resorption and crystallization.
  • * Solid-state diffusion further alters crystal cargoes post-mixing.