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• W2004361077 abstract "Felsic metagranitoids form a major part of the crust, but the metamorphic story they record is difficult to decipher because of a lack of index minerals. The microstructures and metamorphic assemblages of felsic gneisses and metadolerite dykes from the Lewisian Gneiss complex, NW Scotland, have been examined to estimate the pressure–temperature–time (P–T–t) history of the region. Characteristic geometries and compositions of zoned epidote and plagioclase from the gneisses and amphibole from the dykes provide key information. Bulk-rock compositions are modelled to constrain the likely metamorphic conditions experienced by the rocks. P–T–t paths are refined using a novel model for fractionation during grain-recycling of the plagioclase. In the gneisses, plagioclase grains have relatively albitic cores (An10–12) grading to more anorthitic rims (An20–30). The equant grain shapes of the plagioclase and asymmetry of the zoning across grain boundaries are consistent with the zoning having formed during coarsening, or grain-recycling, following deformation. The increase in anorthite content is due to the breakdown of epidote to release Ca and Al. Sharp boundaries between Fe-poor cores and Fe-rich rims in epidote result from the resorption of epidote whilst the plagioclase is growing followed by later regrowth. The possible P–T conditions for the end of deformation and start of grain-recycling are restricted to those that occur along the plagioclase isopleth with the same value as the core compositions. These starting conditions are explored along with P–T–t path orientations over a range of values. The results are compared with the observed compositions and grain sizes to determine the best-fit P–T–t path. Most of the best-fit paths are dominated by decompression rather than heating (both of which result in epidote breakdown). Starting conditions are probably between 9 and 10·2 kbar at around 580°C along a quasi-linear path ending at around 7·5–8 kbar at 600–620°C. The timescale of decompression is poorly constrained owing to the uncertainty in the grain-recycling parameters. Rates of exhumation are between 0·14 and 2 mm a–1, which are reasonable within the range of present-day processes. Scourie dyke assemblages and mineral zoning broadly corroborate this P–T–t path. The path is similar to those recorded in Phanerozoic orogenic cycles but the significance of this work lies in our new methods for elucidating the metamorphic histories of metagranitoids." @default.
• W2004361077 created "2016-06-24" @default.
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• W2004361077 date "2014-09-24" @default.
• W2004361077 modified "2023-10-07" @default.
• W2004361077 title "Microstructural and Metamorphic Constraints on the Thermal Evolution of the Southern Region of the Lewisian Gneiss Complex, NW Scotland" @default.
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• W2004361077 doi "https://doi.org/10.1093/petrology/egu049" @default.
• W2004361077 hasPublicationYear "2014" @default.
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