Holness, M. B. and Winpenny, B. (2009) The Unit 12 allivalite, Eastern Layered Intrusion, Isle of Rum: a textural and geochemical study of an open-system magma chamber. Geological Magazine, 146 (3). pp. 437-450. ISSN ISSN: 0016-7568 EISSN: 1469-5081 DOI https://doi.org/10.1017/S0016756808005797
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Abstract
The Eastern Layered Intrusion of the Rum Central Complex, NW Scotland, comprises 16 macro-units broadly defined by a basal peridotite body overlain by gabbros and troctolites. The local term for the upper plagioclase-bearing cumulates is ‘allivalite’. The Unit 12 allivalite contains five subsidiary peridotite horizons, each continuous on the kilometre scale. Field, textural and geochemical evidence points to the Unit 12 allivalite forming by progressive accumulation of crystals from up to seven separate magma batches, varying from picrite to basalt. The thickness of the magma lens in the sill-like chamber was as low as 30 m during a significant part of the development of the Unit 12 allivalite, and evidence supports one eruption from the chamber during its accumulation.
Item Type: | Article |
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Uncontrolled Keywords: | 08AREP IA56 2008 P, Part III |
Subjects: | 05 - Petrology - Igneous, Metamorphic and Volcanic Studies |
Divisions: | 05 - Petrology - Igneous, Metamorphic and Volcanic Studies |
Journal or Publication Title: | Geological Magazine |
Volume: | 146 |
Page Range: | pp. 437-450 |
Identification Number: | https://doi.org/10.1017/S0016756808005797 |
Depositing User: | Sarah Humbert |
Date Deposited: | 16 Feb 2009 13:02 |
Last Modified: | 23 Jul 2013 10:07 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/404 |
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