Kinsman Granodiorite

(Kinsman Quartz Monzonite of Billings, 1955) - Foliated granite, granodiorite, tonalite, and minor quartz diorite; large megacrysts of potassium feldspar characteristic; garnet locally abundant.
State New Hampshire
Name Kinsman Granodiorite
Geologic age Early Devonian
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granodiorite (Pluton)
Minor
Igneous > Plutonic > Granitic > Granite (Pluton)
Igneous > Plutonic > Granitic > Tonalite (Pluton)
Incidental
Igneous > Plutonic > Dioritic > Quartz-diorite (Pluton)
Comments Part of the New Hampshire Plutonic Suite (Late to Early Devonian) - Includes synkinematic and postkinematic granitoids related to the Acadian orogeny. Ages range from 410 to 365 Ma. New Hampshire Plutonic Suite: Lincoln pluton = <422 and >400 U/Pb, monazite and zircon (J.N. Aleinikoff, oral commun., June 8, 1990). Cardigan pluton = 411+/-19 Rb/Sr per NH028 and 413+/-5 Nd/Sm per NH029.
References

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.

https://ngmdb.usgs.gov/Prodesc/proddesc_37338.htm

Billings, M.P., 1955, Geologic map of New Hampshire: Washington, D.C., U.S. Geological Survey, scale 1:250,000.

Lyons, J.B., and Livingston, D.E., 1977, Rb-Sr age of the New Hampshire Plutonic Series: Geological Society of America Bulletin, v. 88, p. 1808-1812.

Barreiro, Barbara, and Aleinikoff, J.N., 1985, Sm-Nd and U-Pb isotropic relationships in the Kinsman Quartz Monzonite, New Hampshire [abs.]: Geological Society of America Abstracts with Programs, v. 17, p. 3.

NGMDB product
Counties Belknap - Carroll - Cheshire - Coos - Grafton - Hillsborough - Merrimack - Sullivan