Experimental petrology of alkalic lavas: constraints on cotectics of multiple saturation in natural basic liquids

  title={Experimental petrology of alkalic lavas: constraints on cotectics of multiple saturation in natural basic liquids},
  author={R. Sack and D. Walker and I. Carmichael},
  journal={Contributions to Mineralogy and Petrology},
Experimental study of natural alkalic lava compositions at low pressures (pO2∼QFM) reveals that crystallization of primitive lavas often occurs in the sequence olivine, plagioclase, clinopyroxene, nepheline without “obvious” reaction relation. Pseudoternary liquidus projections of multiply saturated liquids coexisting with plagioclase (±olivine±clinopyroxene±nepheline) have been prepared to facilitate graphical analysis of the evolution of lava compositions during hypabyssal cooling. Use of… Expand
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