Pre-eruptive magma mixing in ash-flow deposits of the Tertiary Rum Igneous Centre, Scotland

  title={Pre-eruptive magma mixing in ash-flow deposits of the Tertiary Rum Igneous Centre, Scotland},
  author={V. Troll and C. Donaldson and C. H. Emeleus},
  journal={Contributions to Mineralogy and Petrology},
The Northern Marginal Zone of the Rum Igneous Centre is a remnant of an early caldera and its infill. It is composed of intra-caldera breccias and various small-volume pyroclastic deposits, overlain by prominent rhyodacite ash-flow sheets of up to 100 m thickness. The ash-flows were fed from a feeder system near the caldera ring-fault, and intrusive rhyodacite can locally be seen grading into extrusive deposits. A variety of features suggest that the ash-flows were erupted from a magma chamber… Expand
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