Hornblende-biotite quartz monzodiorite

Composition ranges from quartz monzonite to diorite.
State New Hampshire
Name Hornblende-biotite quartz monzodiorite
Geologic age Jurassic
Lithologic constituents
Major
Igneous > Plutonic > Dioritic > Monzodiorite (Pluton)hornblende-biotite quartz monzodiorite
Minor
Igneous > Plutonic > Syenitic > Quartz-monzonite (Pluton)composition ranges from quartz monzonite to diorite.
Igneous > Plutonic > Dioritic > Diorite (Pluton)composition ranges from quartz monzonite to diorite.
Comments Part of the White Mountain igneous province of McHone and Butler (1984) - Overall part of the White Mountain Plutonic-Volcanic Suite - Includes Cretaceous alkalic syenite to granitic to gabbroic plutons, minor volcanic rocks, and lamprophyre dikes of the New England-Quebec igneous province of McHone and Butler (1984); also includes Jurassic granite and syenite and less abundant quartz syenite, diorite, gabbro, nepheline syenite, and volcanic rocks of the White Mountain igneous province of McHone and Butler (1984).
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

McHone, J.G., and Butler, J.R., 1984, Mesozoic igneous provinces of New England and the opening of the North Atlantic Ocean: Geological Society of America Bulletin, v. 95, p. 757-765.

NGMDB product
Counties Belknap - Coos