Moat Volcanics

Bedded and ignimbritic tuffs, flows, and breccias; also porphyritic rhyolite and minor trachyte.
State New Hampshire
Name Moat Volcanics
Geologic age Middle Jurassic?
Lithologic constituents
Igneous > Volcanic (Pyroclastic-tuff, Pyroclastic-ash flow, Volcaniclastic-volcanic breccia)bedded and ignimbritic tuffs, flows, and breccias
Igneous > Volcanic > Felsic-volcanic > Rhyolite
Igneous > Volcanic > Felsic-volcanic > Trachyte
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). White Mountain Plutonic-Volcanic Suite, ALL ages per NH023. lower part of Moat Volcanics = 173+/-2 Rb/Sr. upper part of Moat Volcanics = 168+/-1 Rb/Sr. trachyte of Moat Volcanics = 169+/-4 and 162+/-4 K/Ar.

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.

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.

Eby, G.N., Krueger, H.M., and Creasy, J.W., 1992, Geology, geochronology, and geochemistry of the White Mountain batholith, New Hampshire, in Puffer, J.H., and Ragland, P.C., eds., Eastern North American Mesozoic magmatism: Geological Society of America Special Paper 268, p. 379-397.

NGMDB product
Counties Belknap - Carroll - Grafton