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Evolution of coronas in Norwegian anorthosites: re-evaluation based on crystal-chemistry and microstructures

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Abstract

Coarse grained garnet-pyroxene coronas in anorthositic gabbros of the Bergen and Sognefjord areas preserve relics of two stages of reaction during cooling from magmatic T: (1) ol + plag→cpx I+ opxI + spn; (2) cpxI + opxI + spn + plag→cpxII + opxII + gnt.

Geothermobarometry on the products of reaction (1), using Fe3+ cpx and AlIV opx values derived by X-ray structure refinement (XRef), yields T=900–950° C, P=10–11 kb. Even higher T, probably at lower P, is inferred for reaction (2); this is consistent with TEM observations of pigeonite lamellae in cpxI.

Transmission electron microscopy (TEM) observations show abundant submicroscopic amphibole lamellae in cpxII, and XRef analyses of coexisting massive amphiboles suggest incomplete occupancy of the H site; both observations suggest low but finite \(p_{H_2 O}\) during granulite-facies metamorphism. TEM observations also show that later (retrograde) hydration, particularly of orthopyroxenes, is more extensive than suggested by petrographic studies. Late amphiboles have fully occupied H sites, indicating higher \(p_{H_2 O}\). The integration of XRef and TEM studies with more conventional petrographic and electron microprobe (EMP) data, as in this study, gives a powerful tool for the study of metamorphic reactions.

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Authors and Affiliations

  1. Mineralogisk-Geologisk Museum, Sarsgate 1, N-0562, Oslo 5, Norway

    W. L. Griffin

  2. Centro di Studio per la Geologia Strutturale e Dinamica dell' Appennino, C.N.R., via Santa Maria 53, I-56100, Pisa, Italy

    M. Meillini

  3. Centro di Studio per la Cristallografia Strutturale, C.N.R., via A. Bassi 4, I-27100, Pavia, Italy

    R. Oberti & G. Rossi

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  1. W. L. Griffin
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  2. M. Meillini
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  3. R. Oberti
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  4. G. Rossi
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Griffin, W.L., Meillini, M., Oberti, R. et al. Evolution of coronas in Norwegian anorthosites: re-evaluation based on crystal-chemistry and microstructures. Contr. Mineral. and Petrol. 91, 330–339 (1985). https://doi.org/10.1007/BF00374689

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