Microstructural evidence for crystallization regimes in mafic intrusions: a case study from the Little Minch Sill Complex, Scotland.
View / Open Files
Publication Date
2018Journal Title
Contrib Mineral Petrol
ISSN
0010-7999
Publisher
Springer Science and Business Media LLC
Volume
173
Issue
12
Pages
97
Language
eng
Type
Article
This Version
VoR
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Nicoli, G., Holness, M., Neufeld, J., & Farr, R. (2018). Microstructural evidence for crystallization regimes in mafic intrusions: a case study from the Little Minch Sill Complex, Scotland.. Contrib Mineral Petrol, 173 (12), 97. https://doi.org/10.1007/s00410-018-1525-7
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.
Keywords
Convection, Crystallization, Grain size, Microstructure, Olivine, Sill
Sponsorship
Natural Environment Research Council (NE/N009894/1)
Identifiers
External DOI: https://doi.org/10.1007/s00410-018-1525-7
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286557
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.
Recommended or similar items
The current recommendation prototype on the Apollo Repository will be turned off on 03 February 2023. Although the pilot has been fruitful for both parties, the service provider IKVA is focusing on horizon scanning products and so the recommender service can no longer be supported. We recognise the importance of recommender services in supporting research discovery and are evaluating offerings from other service providers. If you would like to offer feedback on this decision please contact us on: support@repository.cam.ac.uk