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Mg-Fe Order-Disorder in Ferromagnesian Silicates

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Book cover Advances in Physical Geochemistry

Part of the book series: Advances in Physical Geochemistry ((PHYSICAL GEOCHE,volume 2))

Abstract

Intracrystalline distribution in silicates has been a subject of interest among geochemists since the classical work of Goldschmidt (1954).1 The phenomenon of strong Fe2+ -Mg ordering in two of the common rock-forming ferromagnesian silicates, pyroxenes and amphiboles, was discovered in the early sixties through single-crystal X-ray diffraction study. Soon thereafter, the possibility of rapid determination of intracrystalline Fe2+-Mg distributions through the newly discovered technique of Mössbauer resonance spectroscopy attracted the attention of a number of mineralogists and petrologists, because such distributions are related to the thermodynamic mixing properties of the Fe2+ and Mg-end member components, which are necessary for phase equilibrium calculations, and also to the cooling history of rocks. The purpose of this work (Parts I and II) is to critically review and synthesize the various contributions made in this field in the last two decades. We also include some of our own results, which are presented here for the first time. The crystal-chemical details, which are necessary to understand the atomic forces governing the Fe2+-Mg distribution in ferromagnesian silicates, as well as the experimental techniques commonly utilized to determine Fe2+ -Mg distribution, are reviewed in Part I (Ghose). Part II (Ganguly) deals with the thermodynamics and kinetics of Fe2+-Mg order-disorder and their application to geologic problems. Hopefully, this review will stimulate further interest in the subject and provide directions for future work.

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Authors
  1. S. Ghose
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  2. J. Ganguly
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Editors and Affiliations

  1. Department of Geology, Brooklyn College, City University of New York, Brooklyn, NY, 11210, USA

    Surendra K. Saxena

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Ghose, S., Ganguly, J. (1982). Mg-Fe Order-Disorder in Ferromagnesian Silicates. In: Saxena, S.K. (eds) Advances in Physical Geochemistry. Advances in Physical Geochemistry, vol 2. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-5683-0_1

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