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Element mobility associated with syn‐metamorphic shear zones near Scotchport, NW Mayo, Ireland
Author(s) -
WINCHESTER J. A.,
MAX M. D.
Publication year - 1984
Publication title -
journal of metamorphic geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.639
H-Index - 114
eISSN - 1525-1314
pISSN - 0263-4929
DOI - 10.1111/j.1525-1314.1984.tb00281.x
Subject(s) - geology , shear zone , metamorphic rock , shear (geology) , gneiss , metamorphic facies , geochemistry , epidote , metasomatism , mylonite , petrology , facies , geomorphology , seismology , tectonics , paleontology , mantle (geology) , quartz , structural basin , chlorite
Three major blastomylonitic synmetamorphic (epidote amphibolite to mid amphibolite facies) shear zones are seen on the NW coast of the Mullet Peninsula in NW Mayo. These shear zones occur at the contacts of major structural units and in an imbricated slice where rocks of the Erris Complex are deformed and chemically modified. Chemical changes associated with individual shear zones have been deduced by comparing the compositions of various gneisses both within and adjacent to the shear zones. Compositional changes are different in the constituent rock‐types within each unit and many elements normally considered immobile have been selectively mobilized within the shear zones. Little evidence of wholesale metasomatic introduction of components into these shear zones was found to accompany the selective mobilization.