Table of Contents


The Grenadine islands
  • Bequia
  • Mineralogy, Petrology and Phenocryst Chemistry of the Bequia Volcanic Rocks
    Bequia blocks
    Mineral Chemistry of the Plutonic blocks

    Equilibrium, physical conditions and crystallization processes

    Earth Sciences

    University of Windsor
    Memorial Hall, Room 203
    401 Sunset Avenue Windsor, Ontario Canada N9B 3P4
    Phone: (519) 253-3000 ext:2492
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    Terence E Smith
    Professor Emeritus


    For descriptions of the geology of the Grenadine Islands, including Bequia, see Westercamp et al., 1985, Etude Monographique, Documents du Bureau de Recherches Geologiques et Minieres, 92, 198 p.

    Figure 1. The Grenadine Islands and the Lesser Antilles Arc.

    A detailed discussion of the petrogeneses of the Bequia volcanic rock suites has been previously published (Smith et al., Journal of Petrology, 1996, 37,117-143).

    It is one of the best documented examples from the Lesser Antillles Arc showing that some of the lavas formed by closed-system fractional crystallization and others by assimilation-fractional crystallization.

    29 new whole rock analyses of the lavas and dykes, and a summary of more than 350 analyses of the chemistry and zoning of the intratelluric minerals of the volcanic rocks, are described and discussed.

    In addition, a summary of more than 500 chemical analyses, and a limited number of isotopic ratios, of the minerals making up the associated plutonic blocks, and of glass inclusions and selvedges, is presented and discussed.

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