Summary
The study of the petrochemistry, eruptive sequence and relative amounts of the Scottish Carboniferous-Permian igneous rocks leads to their genetic classification into three principal and two co-lateral series.
The origin of the series is attributed to the influence of alkali-volatile diffusion-differentiation of the primary magma corresponding to olivine-basalt.
The origin of the separate members of the series is attributed to crystallization-differentiation and in a lesser degree to diffusion-differentiation.
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References
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Tomkeieff, S.I. Petrochemistry of the Scottish Carboniferous-Permian igneous rocks. Bull Volcanol 1, 59–87 (1937). https://doi.org/10.1007/BF03028043
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DOI: https://doi.org/10.1007/BF03028043