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Mineralogical Magazine; October 2000; v. 64; no. 5; p. 779-790
© 2000 Mineralogical Society of Great Britain and Ireland
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Mineral fractionation and pre- and post-emplacement processes in the uppermost part of the Shiant Isles Main Sill

C. M. B. Henderson1,*, F. G. F. Gibb2 and K. A. Foland3

1 Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK
2 Environmental & Geological Sciences, University of Sheffield, Sheffield S3 7HF, UK
3 Department of Geological Sciences, Ohio State University, Columbus, Ohio 43210, USA

* E-mail: michael.henderson{at}man.ac.uk

Reinvestigation of the top 25 m of the 165 m thick Shiant Isles Main Sill requires reinterpretation of its internal structure, especially of the last unit emplaced – the granular olivine picro-dolerite. New mineral analyses allowere-assessment of the magmatic processes involved in the intrusion and differentiation of this classic multiple sill. C-shaped vertical mineral composition profiles, which occur in olivine-rich, alkaline basaltic sills, reflect reaction between phenocrysts and variable composition liquids. A case is made for vertical migration of interstitial liquids within and across the boundaries of intrusive units, for the mixing of such liquids from adjacent units, and for their influence on mineral chemistry on both sides of the interface.

KEYWORDS: picro-dolerite, olivine, mineral fractionation, interstitial liquid, Shiant Isles




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 J PetrologyHome page
F. G. F. GIBB and C. M. B. HENDERSON
Chemistry of the Shiant Isles Main Sill, NW Scotland, and Wider Implications for the Petrogenesis of Mafic Sills
J. Petrology, January 1, 2006; 47(1): 191 - 230.
[Abstract] [Full Text] [PDF]


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