Abstract
A DETAILED study of the granite of Brixen has been contributed by Herr Bruno Sander to the Jahrbuch der k.k. geologischen Reichsanstalt, vol. Ivi. (1906), p. 707, which, involves many interesting questions of the intimate penetration of sediments by igneous rocks, and directs fresh attention td the marginal fades known as tonalite-gneiss (pp. 726–34). The author shows that a foliated structure existed in this rock before deformation by pressure occurred. Dr. Trener, on the other hand (ibid., pp. 415 and 458), in a paper on the Presanella group, containing many petrographic details, treats tonalite-gneiss as a, product of pressure, and the basic inclusions in it as segregations. One of Sander's most suggestive observations is the finding of amphibolites, closely resembling the tonalite-gneiss, in the old limestone series that has been invaded by the granite; and he is led to ask (p. 734) whether the occurrence of tonalite-gneiss does not in some way depend on the horizon selected by the granite for its intrusion continuously from Meran to Mauls.
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C., G. Some Recent Petrological Papers . Nature 78, 138–140 (1908). https://doi.org/10.1038/078138b0
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DOI: https://doi.org/10.1038/078138b0