Abstract
Abstract Field work, confirmed by laboratory petrographic studies, demonstrates that autochthonous Triassic formations of the Girotte lake area in the Savoy Alps, France, were subjected to regional metamorphic processes which also caused metamorphism of the underlying crystalline basement rocks but which did not affect Liassic strata to any considerable degree. The Triassic formations probably constituted an obstacle to the advance of the metamorphic front, indicating that alteration was a process of solid diffusion.
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