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The metamorphic evolution of garnet-cordierite-sillimanite-gneisses of the Gruf-Complex, Eastern Pennine Alps by Kurt Bucher -Nurminen; Giles Droop is a Earth and Planetary Sciences article available to read on EtoBox.

What is The metamorphic evolution of garnet-cordierite-sillimanite-gneisses of the Gruf-Complex, Eastern Pennine Alps about?

Metapelitic gneisses occuring as lenses and bands within the migmatites of the Gruf-Complex in the eastern Pennine Alps contain various combinations of the minerals quartz, biotite, cordierite, garnet, sillimanite, plagioclase, K-feldspar, spinel, orthopyroxene, anthophyllite and muscovite. The most common rock type is represented by a dark schist~ bi~176 A consistent pressure-temperature range of 3-4 kb and 600-650~ C has been calculated for the last metamorphic equilibration from six geological thermobarometers. However, from textural evidence it may be concluded that the rocks were at both higher temperatures and pressures prior to the PT-conditions calculated from thermobarometry. Although the maximum conditions reached are unknown and earlier stages are poorly preserved it is suggested that they coincide with the maximum conditions deduced from rare occurrences of sapphirine granulite in the Gruf-Complex. These are 10 kb and 800 ~ C (Droop and Bucher 1983). Sillimanite + K-feldspar, orthopyroxene + quartz, spinel+quartz and garnet-K-feldspar persisting in rocks with low activity of H20 are strong evidence for this. The H20 required to make the observed high degree of equilibra

Who reads The metamorphic evolution of garnet-cordierite-sillimanite-gneisses of the Gruf-Complex, Eastern Pennine Alps?

Author

Kurt Bucher -Nurminen; Giles Droop

Publisher

Springer; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0010-7999)

Published

1983

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)