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The Loch Doon granite: an example of granite petrogenesis in the British Caledonides

Brown, G. C.; Cassidy, J.; Tindle, A. G. and Hughes, D. J. (1979). The Loch Doon granite: an example of granite petrogenesis in the British Caledonides. Journal of the Geological Society, 136(6) pp. 745–753.

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The Loch Doon igneous complex lies to the N of the Solway–Shannon Iapetus Ocean suture line through the British Isles, but in a region lacking the Proterozoic continental basement which is known to exist further N. It comprises a genetically related magma suite ranging from hypersthene diorite margins through quartz monzonite to granite at the centre. Petrochemical data, studies of xenolith and autolith densities and field radiometric mapping indicate that the suite lacks sharp internal boundaries but is gradational and based on a monzodiorite parental magma which evolved through a two-stage crystal fractionation process. The early crystallization of dioritic margins was dominated by pyroxene-plagioclase precipitation and these minerals were joined later by biotite as acidic residual liquids developed. Biotite formation and fractionation at the expense of pyroxenes is related to contamination of the magma by water from the roof zone. Partial assimilation of roof material, particularly in the form of xenoliths, and mixing between cumulates and residual liquids are also recognized but are of relatively minor importance.

These petrochemical, geophysical and isotopic studies of the Southern Uplands granites indicate the generation of parental magmas by the partial fusion of metabasaltic lower crust or crustal underplate as a late event in the evolution of the Iapetus Ocean.

Item Type: Journal Item
Copyright Holders: 1979 Geological Society of London
ISSN: 0016-7649
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 13107
Depositing User: Elizabeth Lomas
Date Deposited: 13 Feb 2009 10:30
Last Modified: 02 May 2018 12:56
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