Nulhegan pluton - inner zone

Light-gray to dark-gray, medium- to coarse-grained, massive, biotite-clotted, hornblende-quartz monzodiorite, minor granodiorite, and granite. Rb/Sr whole-rock age of 390±14 Ma (Ayuso and Arth, 1992). Igneous rocks of the Northeast Kingdom batholith of Ayuso and Arth (1992). Part of the New Hampshire Plutonic Suite.
State Vermont
Name Nulhegan pluton - inner zone
Geologic age Devonian
Lithologic constituents
Major
Igneous > Plutonic > Dioritic > Quartz-monzodiorite (Pluton)Light-gray to dark-gray, medium- to coarse-grained, massive, biotite-clotted, hornblende-quartz monzodiorite.
Minor
Igneous > Plutonic > Granitic > Granite (Pluton)
Igneous > Plutonic > Granitic > Granodiorite (Pluton)
References
NGMDB product
Counties Essex