Phosphorus zoning as a recorder of crystal growth kinetics: application to second-generation olivine in mantle xenoliths from the Cima Volcanic Field

I. Baziotis, P. D. Asimow, T. Ntaflos, J. W. Boyce, F. M. McCubbin, A. Koroneos, D. Perugini, S. Flude, M. Storey, Y. S. Liu, S. Klemme, J. Berndt

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)
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Abstract

Composite mantle xenoliths from the Cima Volcanic Field (CA, USA) contain glassy veins that cross-cut lithologic layering and preserve evidence of lithospheric melt infiltration events. Compositions and textures of minerals and glasses from these veins have the potential to place constraints on the rates and extents of reaction during infiltration. We studied glass-bearing regions of two previously undescribed composite xenoliths, including optical petrography and chemical analysis for major and trace elements by electron probe microanalysis and laser-ablation inductively coupled plasma mass spectrometry. The petrogenetic history of each vein involves melt intrusion, cooling accompanied by both wall-rock reaction and crystallization, quench of melt to a glass, and possibly later modifications. Exotic secondary olivine crystals in the veins display concentric phosphorus (P)-rich zoning, P-rich glass inclusions, and zoning of rapidly diffusing elements (e.g., Li) that we interpret as records of rapid disequilibrium events and cooling rates on the order of 10 °C/h. Nevertheless, thermodynamic modeling of the diversity of glass compositions recorded in one of the samples demonstrates extensive reaction with Mg-rich olivine from the matrix before final quench. Our results serve as a case study of methods for interpreting the rates and processes of lithospheric melt-rock reactions in many continental and oceanic environments.

Original languageEnglish
Article number58
Number of pages32
JournalContributions to Mineralogy and Petrology
Volume172
Issue number7
DOIs
Publication statusPublished - 28 Jun 2017

Keywords

  • boundary layer
  • diffusive relaxation
  • mantle xenoliths
  • metasomatism
  • olivine rapid growth
  • phosphorus zoning
  • lithologic layering
  • petrogenetic history
  • rapid disequilibrium events
  • thermodynamic modeling

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