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Mylonization near Philadelphia

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Journal Article
Journal: GSA Bulletin
Published: 01 May 1941
GSA Bulletin (1941) 52 (5): 667–694.
...ELIZABETH ARMSTRONG Abstract The pre-Cambrian banded gneiss of a part of the Piedmont Plateau near Philadelphia is interpreted as a hybrid rock, resulting from the thorough injection of felsic material into a plagioclase amphibolite. The composition of the injecting solutions probably ranged from...