Caracteres petrographiques et petrochimiques des roches eruptives grenues de la Font-des-Vaches (massif volcanique du Cantal)

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Abstract
Eruptive rocks of the Font-des-Vaches complex in the Pliocene trachyphonolite massif of the Cantal region, France, were described by Lacroix in 1907 as a dike of "essexite-gabbro" emplaced in older volcanic rocks and subsequently exposed by erosion. Although the Font-des-Vaches rock is exposed over only a small area, and contact with the surrounding trachyphonolite is obscured, detailed petrographic and chemical studies seem clearly to indicate a complete gradation from one into the other. It is concluded that the Font-des-Vaches rock is, from its more acidic nature, a pegmatitoid of the ankaratrite type, formed in the final stage of crystallization of residual magma following crystallization of the surrounding trachyphonolite.

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