Black Mountain pluton of the Guilford dome

Weakly foliated, light-gray to whitish-gray, garnet-biotite-muscovite granite, minor pegmatite, and aplite dikes (Dg). Rb/Sr muscovite age of 383±7 Ma (Naylor, 1971) and a U-Pb zircon upper- intercept age of 364±4 Ma, no. 48 (Aleinikoff and others, 2011). Devonian granitic rocks of southern Vermont. Part of the New Hampshire Plutonic Suite.
State Vermont
Name Black Mountain pluton of the Guilford dome
Geologic age Devonian
Lithologic constituents
Major
Igneous > Plutonic > Granitic > GraniteWeakly foliated, light-gray to whitish-gray, garnet-biotite-muscovite granite.
Minor
Igneous > Plutonic > Granitic > Leucocratic-granitic > Pegmatite
Igneous > Plutonic > Granitic > Leucocratic-granitic > ApliteAplite dikes.
References
NGMDB product
Counties Windham