Trondhjemite and quartz diorite in northern Jefferson dome in Gorham quadrangle

Trondhjemite and quartz diorite in northern Jefferson dome in Gorham quadrangle.
State New Hampshire
Name Trondhjemite and quartz diorite in northern Jefferson dome in Gorham quadrangle
Geologic age Late Ordovician
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Tonalite > Trondhjemite (Pluton)
Igneous > Plutonic > Dioritic > Quartz-diorite (Pluton)
Comments Part of the Oliverian Plutonic Suite (Late Ordovician) - Pink, weakly to moderately foliated, locally porphyritic biotite granitoids found in mantled gneiss domes. Mafic varieties contain hornblends. Variably metamorphosed up to amphibolite facies.
References
NGMDB product
Counties Coos