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Microscopy and Microanalysis of Corona Textures in Eclogitic Greenschists from the Eastern Alps, Austria
Published online by Cambridge University Press: 14 March 2018
Extract
Metamorphic rocks formed under conditions of high temperature (>600°C) and high lithological pressure (>1 GPa) and being subject to a subsequent tectonic uplift commonly include a remarkable number of fascinating mineral textures. One type of these well known and extensively described high-grade metamorphic textures are the so-called corona structures or reaction rims which, by definition, are primarily based on metamorphic reactions that cause the formation of concentric layers of new mineral phases separating an older and unstable mineral core from a newer and equally unstable mineral matrix. In other words, corona structures in metamorphic rocks preserve evidence of changes in the environmental conditions (temperature, pressure, fugacity of H2O) experienced by the rock during its tectonometamorphic history.
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- Copyright © Microscopy Society of America 2008
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