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    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

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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.


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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: http://dx.doi.org/10.1017/S0016756800018045
  • Published online: 01 May 2009
Abstract
Abstract

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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M. Barriere 1976. Flowage differentiation: limitation of the ‘Bagnold effect’ to narrow intrusions. Contributions to Mineralogy andPetrology 55, 139–45.

S. Blake & G. I. Ivey 1986. Density and viscosity gradients in zoned magma chambers, and their influence on withdrawal dynamics. Journal of Volcanology and Geothermal Research 30, 201–30.

W. B. Bryan , L. W. Finger & F. Chayes 1969. Estimating proportions in petrographic mixing equations by least squares approximation. Science 163, 1926–7.

C. H. Donaldson 1976. An experimental investigation of olivine morphology. Contributions to Mineralogy and Petrology 57, 187213.

H. I. Drever & R. Johnston 1965. New petrographical data on the Shiant Isles picrite. Mineralogical Magazine 34, 194203.

F. A. Frey , D. H. Green & S. D. Roy 1978. Integrated models of basalt petrogenesis: a study of quartz tholeiites to olivine melilitites from South Australia utilizing geochemical and experimental petrological data. Journal of Petrology 19, 463513.

F. G. F. Gibb 1973. The zoned clinopyroxenes of the Shiant Isles sill, Scotland. Journal of Petrology 14, 203–30

F. G. F. Gibb & S. A. Gibson 1989. The Little Minch Sill Complex. Scottish Journal of Geology 25, 367–70.

F. G. F. Gibb & C. M. B. Henderson 1984. The structure of the Shiant Isles sill complex, Outer Hebrides. Scottish Journal of Geology 20, 21–9.

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.

H. E. Huppert & R. S. J. Sparks 1989. Chilled margins in igneous rocks. Earth and Planetary Science Letters 92, 397405.

W. P. Nash & J. F. G. Wilkinson 1970. Shonkin Sag Laccolith, Montana. 1. Mafic minerals and estimates of temperature, pressure, oxygen fugacity and silica-activity. Contributions to Mineralogy and Petrology 25, 241–69.

P. L. Roeder & R. F. Emslie 1970. Olivine-liquid equilibrium. Contributions to Mineralogy and Petrology 29, 275–89.

F. Walker 1930. The geology of the Shiant Isles (Hebrides). Quarterly Journal of the Geological Society, London86, 355–98.

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Geological Magazine
  • ISSN: 0016-7568
  • EISSN: 1469-5081
  • URL: /core/journals/geological-magazine
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