Finger structures in the Rhum Complex

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Authors:Butcher, Alan R.; Young, Iain M.; Faithfull, John W.
Author Affiliations:Primary:
Univ. Manchester, Dep. Geol., Manchester, United Kingdom
Other:
Univ. St. Andrews, Dep. Geol., United Kingdom
Univ. Durham, Dep. Geol. Sci., United Kingdom
Volume Title:evolution of the Rhum igneous complex
Volume Authors:Sparks, R. Stephen J., editor
Source:The evolution of the Rhum igneous complex, edited by R. Stephen J. Sparks. Geological Magazine, 122(5), p.491-502. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568
Publication Date:1985
Note:In English. 17 refs.; illus. incl. geol. sketch maps
Summary:The finger-like protrusions of peridotite occur where allivalite overlies peridotite. Typical dimensions are: amplitude 2-5 cm; diameter up to 3 cm; wavelength 5-10 cm. Fingers apparently cut through layering, laminae and lamination without any disruption of these structures. The fingers formed when pore magma from the underlying peridotite migrated upwards due to compaction, and resorbed plagioclase in the allivalite, crystallizing olivine and pyroxene in its place. [C.H.D.]
Subjects:Complexes; Deformation; Igneous rocks; Intrusions; Layered intrusions; Magmas; Peridotites; Petrology; Plutonic rocks; Ultramafics; Europe; Great Britain; Hebrides; Highland region Scotland; Inner Hebrides; Inverness-shire Scotland; Rhum; Scotland; United Kingdom; Western Europe; Allt nam Ba; Alluvalites; Finger structures; Hallival
Abstract Numbers:86M/2360
Record ID:1987037191
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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