Proctor Hill granodiorite gneiss - aplitic and hornblende-rich reaction zones (VTY2pha;0)

Proctor Hill granodiorite gneiss - aplitic and hornblende-rich reaction zones

Within unit Y2phg: aplitic and hornblende-rich reaction zones where in contact with calc-silicate rocks. Crosscuts all paragneiss units; is a thoroughly gneissic rock. Correlated with the Ludlow Mountain granodiorite gneiss. 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	Proctor Hill granodiorite gneiss - aplitic and hornblende-rich reaction zones
Geologic age	Middle Mesoproterozoic
Lithologic constituents	Major Metamorphic > Metasedimentary > ParagneissAplitic and hornblende-rich reaction zones within gray to pinkish-gray, gneissoid magnetite-biotite-microcline-perthite granodiorite, and locally microcline megacrystic gneissic granite. Metamorphic > Gneiss > Hornblende-gneissAplitic and hornblende-rich reaction zones within gray to pinkish-gray, gneissoid magnetite-biotite-microcline-perthite granodiorite, and locally microcline megacrystic gneissic 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	Rutland

Proctor Hill granodiorite gneiss - aplitic and hornblende-rich reaction zones

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.