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      Microstructural evidence for crystallization regimes in mafic intrusions: a case study from the Little Minch Sill Complex, Scotland

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          Abstract

          The magma forming the 20 m thick crinanitic/picrodoleritic Dun Raisburgh sill, part of the Little Minch Sill Complex of NW Scotland, comprised a mafic carrier liquid with a crystal cargo of plagioclase and olivine (1 vol%). The olivine component of the cargo settled on the floor of the intrusion while the more buoyant plagioclase component remained suspended during solidification, resulting in a relatively high plagioclase content in the centre of the sill. The settled olivine grains form a lower fining-upwards sequence overlain by a poorly sorted accumulation formed of grains that grew within the convecting magma. The accumulation of olivine on the sill floor occurred over 5–10 weeks, synchronous with the upwards-propagation of a solidification front comprising a porous (~ 70 vol% interstitial liquid) plagioclase-rich crystal mush.

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          The physical character of subaqueous sedimentary density flows and their deposits

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            Measurement of crystal size distributions

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              A chart for judging the reliability of point counting results

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                Author and article information

                Contributors
                ng422@cam.ac.uk
                Journal
                Contrib Mineral Petrol
                Contrib Mineral Petrol
                Contributions to Mineralogy and Petrology. Beitrage Zur Mineralogie Und Petrologie
                Springer Berlin Heidelberg (Berlin/Heidelberg )
                0010-7999
                9 November 2018
                9 November 2018
                2018
                : 173
                : 12
                : 97
                Affiliations
                [1 ]ISNI 0000000121885934, GRID grid.5335.0, Department of Earth Sciences, , University of Cambridge, ; Downing Street, CB2 3EQ Cambridge, UK
                [2 ]ISNI 0000000121885934, GRID grid.5335.0, BP Institute for Multiphase Flow, , University of Cambridge, ; Madingley Road, CB3 0EZ Cambridge, UK
                [3 ]ISNI 0000000121885934, GRID grid.5335.0, Department of Applied Mathematics and Theoretical Physics, , University of Cambridge, ; Wilberforce Rd, CB3 0WA Cambridge, UK
                [4 ]Jacobs Douwe Egberts, Ruscote Ave, OX16 2QU Banbury, UK
                Author notes

                Communicated by Chris Ballhaus.

                Author information
                http://orcid.org/0000-0002-5794-6820
                Article
                1525
                10.1007/s00410-018-1525-7
                6404684
                d28c79ce-391b-44ec-b48f-1cf68c7af182
                © The Author(s) 2018

                Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

                History
                : 19 July 2018
                : 26 October 2018
                Categories
                Original Paper
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                © Springer-Verlag GmbH Germany, part of Springer Nature 2018

                sill,crystallization,convection,microstructure,olivine,grain size

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