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    Latypov, R. 2009. Testing the Validity of the Petrological Hypothesis 'No Phenocrysts, No Post-emplacement Differentiation'. Journal of Petrology, Vol. 50, Issue. 6, p. 1047.

    LATYPOV, RAIS and CHISTYAKOVA, SOFYA 2009. Phase equilibria testing of a multiple pulse mechanism for origin of mafic–ultramafic intrusions: a case example of the Shiant Isles Main Sill, NW Scotland. Geological Magazine, Vol. 146, Issue. 06, p. 851.

    Preston, R.J. Hole, M.J. and Still, J. 1999. Exceptional REE-enrichment in apatite during the low pressure fractional crystallisation of alkali olivine basalt; an example from the British Tertiary Igneous Province. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol. 90, Issue. 04, p. 273.

    Walker, George P.L. 1999. Volcanic rift zones and their intrusion swarms. Journal of Volcanology and Geothermal Research, Vol. 94, Issue. 1-4, p. 21.


Igneous stratigraphy and internal structure of the Little Minch Sill Complex, Trotternish Peninsula, northern Skye, Scotland

  • Sally A. Gibson (a1) and Adrian P. Jones (a1)
  • DOI:
  • Published online: 01 May 2009

Detailed sampling of the Little Minch Sill Complex reveals that it is composed of both single and multiple sills. These are formed of three main, genetically related units: picrite, picrodolerite and crinanite, which are the result of differentiation of an alkali-olivine basalt magma (approximately 10% MgO) in an upper-crustal magma chamber. Variations in igneous stratigraphy and the presence of internal chills in the Trotternish sills suggest that they were emplaced by multiple intrusion and subsequently differentiated in situ. Changes in petrography adjacent to pegmatite veins and textures within picrite units indicate compaction and filter-pressing were important processes after emplacement. Rhythmic layering (1 cm to 1 m thick) is conspicuous in the sills near contacts but does not involve cryptic mineral variation. Such modal layering may be more common than realised in relatively small-scale intrusions and maybe modelled in terms of in situ differentiation under conditions of significant undercooling in a changing thermal gradient at the synthetic for-sterite-diopside-anorthite eutectic.

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S. A. Gibson 1990. The geochemistry of the Trotternish sills, Skye, Scotland: crustal contamination in the British Tertiary Volcanic Province. Journal of the Geological Society, London147, 1071–81.

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Geological Magazine
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