On an anatectic granite from Bygland, south Norway
1973; Cambridge University Press; Volume: 39; Issue: 302 Linguagem: Inglês
10.1180/minmag.1973.039.302.09
ISSN1471-8022
AutoresR. N. Sen, Ananda Deb Mukherjee,
Tópico(s)Paleontology and Stratigraphy of Fossils
ResumoSummary The Pre-Cambrian granitic rocks of Bygland are structurally and texturally concordant with the metamorphosed country rocks. Both these rock types plot close together in Q-Or-Ab and Ab-An-Or normative diagrams; trace element distribution is also similar. The granite has been reconstituted from the country rocks under epidote-amphibolite facies conditions. Plagioclase feldspars show that the granite is not a ‘mature’ rock; they are, however, ‘mature’ in the country rocks and are products of typical regional metamorphism (Ohta et al , 1968). Plagioclases in the granite are relicts of country rocks showing traces of a premetamorphic crystalline state. They have been rejuvenated with the introduction of alkali material during the reconstitution.
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