Contributions to Mineralogy and Petrology

, Volume 107, Issue 1, pp 8–20 | Cite as

Reequilibration of chromite within Kilauea Iki lava lake, Hawaii

  • P. A. H. Scowen
  • P. L. Roeder
  • R. T. Helz
Article

Abstract

Chromite mainly occurs as tiny inclusions within or at the edges of olivine phenocrysts in the 1959 Kilauea Iki lava lake. Liquilus chromite compositions are only preserved in scoria that was rapidly quenched from eruption temperatures. Analyses of drill core taken from the lava lake in 1960, 1961, 1975, 1979, and 1981 show that chromite becomes richer in Fe+2, Fe+3, Ti and poorer in Mg, Al, Cr than the liquidus chromite. The amount of compositional change depends on the time elapsed since eruption, the cooling history of the sample, the extent of differentiation of the interstitial melt, and the position of the chromite inclusion within the olivine phenocryst. Compositional changes of the chromite inclusions are thought to be a result of reequilibration with the residual melt by cationic diffusion (Mg, Al, Cr outwards and Fe+2, Fe+3, Ti inwards) through olivine. The changing chemical potential gradients produced as the residual melt cools, crystallizes and differentiates drives the reequilibration process. Major and minor element zoning profiles in olivine phenocrysts suggest that volume diffusion through olivine may have been the major mechanism of cationic transport through olivine. The dramatic compositional changes observed in chromite over the 22 years between eruption and 1981 has major implications for othe molten bodies.

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • P. A. H. Scowen
    • 1
  • P. L. Roeder
    • 1
  • R. T. Helz
    • 2
  1. 1.Department of Geological SciencesQueen's UniversityKingstonCanada
  2. 2.US Geological SurveyRestonUSA
  3. 3.Research School of Earth SciencesAustralian National UniversityCanberraAustralia

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