Granite, granodiorite, and tonalite

Granite, granodiorite, and tonalite.
State New Hampshire
Name Granite, granodiorite, and tonalite
Geologic age Late Ordovician
Lithologic constituents
Igneous > Plutonic > Granitic > Granodiorite (Pluton)
Igneous > Plutonic > Granitic > Tonalite (Pluton)
Igneous > Plutonic > Granitic > Granite (Pluton)
Comments Part of the Oliverian Plutonic Suite (Late Ordovician) - Pink, weakly to moderately foliated, locally porphyritic biotite granitoids found in mantled gneiss domes. Mafic varieties contain hornblends. Variably metamorphosed up to amphibolite facies. Oliverian Plutonic Suite: Keene and Surry dome intrusive rocks = 444+/-8 U/Pb per NH020. Warwick dome intrusive rocks = 444+/-8 U/Pb per NH020.

Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr., 1997, Bedrock Geologic Map of New Hampshire: Reston, VA, U.S. Geological Survey Special Map, 2 sheets, scale 1:250,000.

Zartman, R.E., and Leo, G.W., 1985, New radiometric ages on gneisses of the Oliverian domes in New Hampshire and Massachusetts: American Journal of Science, v. 285, p. 267-280.

NGMDB product
Counties Cheshire