Braintree Intrusive Complex - biotite-bearing metagranodiorite, metagranite, and meta-aplite of the Mount Nevis pluton (VTSbg;0)

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	Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000. https://pubs.er.usgs.gov/publication/sim3184
NGMDB product	NGMDB product page for 96860
Counties	Orange

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

Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000.