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Origin of biotite-hornblende-garnet coronas between oxides and plagioclase in olivine metagabbros, Adirondack region, New York

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Abstract

Complex multivariant reactions involving Fe-Ti oxide minerals, plagioclase and olivine have produced coronas of biotite, hornblende and garnet between ilmenite and plagioclase in Adirondack olivine metagabbros. Both the biotite (6–10% TiO2) and the hornblende (3–6% TiO2) are exceptionally Titanium-rich. The garnet is nearly identical in composition to the garnet in coronas around olivine in the same rocks.

The coronas form in two stages:

  1. (a)

    Plagioclase+Fe-Ti Oxides+Olivine+water =Hornblende+Spinel+Orthopyroxene±Biotite +more-sodic Plagioclase

  2. (b)

    Hornblende+Orthopyroxene±Spinel+Plagioclase =Garnet+Clinopyroxene+more-sodic Plagioclase

The Orthopyroxene and part of the clinopyroxene form adjacent to olivine. Both reactions are linked by exchange of Mg2+ and Fe2+ with the reactions forming pyroxene and garnet coronas around olivine in the same rocks. The reactions occur under granulite fades metamorphic conditions, either during isobaric cooling or with increasing pressure at high temperature.

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Authors and Affiliations

  1. The State Education Department, Geological Survey, New York State Museum, 12230, Albany, N.Y., USA

    Philip R. Whitney

  2. Dept. of Geology, Colgate University, 13346, Hamilton, N.Y., USA

    James M. McLelland

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  1. Philip R. Whitney
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  2. James M. McLelland
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New York State Museum, Journal Series Number 403

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Whitney, P.R., McLelland, J.M. Origin of biotite-hornblende-garnet coronas between oxides and plagioclase in olivine metagabbros, Adirondack region, New York. Contr. Mineral. and Petrol. 82, 34–41 (1983). https://doi.org/10.1007/BF00371173

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  • DOI: https://doi.org/10.1007/BF00371173

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