PETROLOGY OF POSTOROGENIC GRANITOIDS OF THE NORTHERN BALTIC SHIELD

Abstract

In the northern Baltic Shield, diorites, monzodiorites, and quartz diorites are constituents of postorogenic granite massifs, the localization of which was controlled by NE- and NW-trending fault zones. The NE-trending transform faults controlled the emplacement of the Litsa–Aragub and Yuovvoaiv complexes (1.77–1.76 and 1.79–1.77 Ga old, respectively); the Vainospäa Massif; and, probably, the “Nattanen-type” massifs (Nattanen, Tepasto, Pomovaara, Riestovaara) (1.8 to 1.77 Ga old [3]) located at the southern framing of the Lapland granulite belt.