Abstract
The Paleozoic granites of the Meguma zone, which is a suspect terrane in the eastern Appalachians, belong to the South Mountain batholith, one of the largest in northeastern America. Like most of the Hercynian granites of Morocco, particularly those of the Central Massif, they are peraluminous and were emplaced in the terranes that were deformed and metamorphosed in epizonal conditions during an orogeny. The granitic rocks of the Meguma are very similar to those of the Moroccan Central Massif, and are composed of earlier biotite granodiorites and later two-mica monzogranites. Both the granodiorites and the monzogranites are abundantly cut by aplites, pegmatites and porphyry dikes. The geochemical and metallogenic evolution of the Meguma granites is also very comparable to that of the Moroccan granites. However, the age and the scale of ‘granization’ in the Meguma zone are not the same as in the Hercynian Morocco, and this demands a great deal of caution in interpreting the petrochemical resemblances between the granitic rocks of the two regions in favour of a Moroccan origin of the Meguma.
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