Braintree Intrusive Complex - biotite-bearing metagranodiorite, metagranite, and meta-aplite of the Mount Nevis pluton

Yellowish-gray to light-gray, medium- to coarse-grained magnetite-biotite-mesoperthite granodiorite and granite having a U-Pb zircon SHRIMP age of 421±7 Ma, no. 38 (Aleinikoff and others, 2011). Has mutually intrusive contacts with associated metadiorites. Unmapped dike of Sbg in the layered, mixed felsic and mafic rocks (Onbm) of the North River Igneous Suite at Bridgewater has a U-Pb zircon age of 418±1 Ma, no. 37 (Aleinikoff and Karabinos, 1990). Part of the Lake Memphremagog Intrusive Suite (425±3 Ma to 418.5±2 Ma).
State Vermont
Name Braintree Intrusive Complex - biotite-bearing metagranodiorite, metagranite, and meta-aplite of the Mount Nevis pluton
Geologic age Late Silurian
Lithologic constituents
Major
Metamorphic > Metaigneous > Metaintrusive > MetagraniteBiotite-bearing metagranodiorite, metagranite, and meta-aplite of the Mount Nevis pluton; yellowish-gray to light-gray, medium- to coarse-grained magnetite-biotite-mesoperthite granodiorite and granite.
References
NGMDB product
Counties Orange