Ludlow Mountain granodiorite gneiss (VTY2lgg;0)

Ludlow Mountain granodiorite gneiss

Light-gray, medium- to fine-grained garnet-biotite-microcline-perthite granodiorite, magnetite-studded white aplite, and kyanite-tourmaline pegmatite. Contains 0.5-cm clots of muscovite possibly after beryl. Intrudes quartzite, lustrous schists (Y1rs), and calc-silicate rocks on Ludlow Mountain. U-Pb zircon SHRIMP age of 1,309±6 Ma, no. 9 (Aleinikoff and others, 2011). South Londonderry Igneous Suite (Middle and Early Mesoproterozoic) (1,393±9 Ma to 1,309±6 Ma). Mount Holly Complex intrusive rocks. Rocks of the Green Mountain and Lincoln Mountain massifs and eastern domes.

State	Vermont
Name	Ludlow Mountain granodiorite gneiss
Geologic age	Middle Mesoproterozoic
Lithologic constituents	Major Metamorphic > Metasedimentary > ParagneissLight-gray, medium- to fine-grained garnet-biotite-microcline-perthite granodiorite gneiss. Igneous > Plutonic > Granitic > Leucocratic-graniticMagnetite-studded white aplite, and kyanite-tourmaline pegmatite.
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	Rutland - Windsor

Ludlow Mountain granodiorite gneiss

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.