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Na, P, Ti and coordination of Si in garnet from peridotite and eclogite xenoliths

Nature volume 260, pages 696–697 (1976)Cite this article

Abstract

THEORY and experiment show that some cations are surrounded by extra oxygen anions at elevated pressure: for example, Si changes from 4-coordination in quartz and coesite to 6-coordination in stishovite. Sobolev and Lavrent'lev1 suggested that substitution of Na in garnet derived from the mantle is coupled with 6-coordinated Si according to the equation CaVIII+AlVI→NaVIII+SiVI. We show here from sensitive electron-microprobe analyses that Na in garnets from ultramafic and eclogite xenoliths can be explained by coupled substitutions with Ti and P without invoking 6-coordinated Si.

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Authors and Affiliations

  1. Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois, 60637

    F. C. BISHOP & J. V. SMITH

  2. Department of Geology, University of St Andrews, St Andrews, UK

    J. B. DAWSON

Authors
  1. F. C. BISHOP
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  2. J. V. SMITH
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  3. J. B. DAWSON
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BISHOP, F., SMITH, J. & DAWSON, J. Na, P, Ti and coordination of Si in garnet from peridotite and eclogite xenoliths. Nature 260, 696–697 (1976). https://doi.org/10.1038/260696a0

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