| State | New Hampshire |
|---|---|
| Name | Large mesoperthitic phenocrysts in a pink to gray quartz syenite porphyry of ""Albany type"" |
| Geologic age | Cretaceous |
| Lithologic constituents | Major
Igneous > Plutonic > Syenitic > Quartz-syenite (Pluton)Large mesoperthitic phenocrysts in a pink to gray quartz syenite porphyry of ""Albany type"" - Alkalic amphibole or fayalite may be present.
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| Comments | Part of the New England-Quebec 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). Mount Tripyramid intrusive rocks (syenites and some gabbro) of White Mountain Plutonic-Volcanic Suite, 112+/-5 K/Ar, hornblende (Western Geophysical Co., in NH024). |
| 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.Kingsley, Louise, 1931, Cauldron subsidence of the Ossipee Mountains: American Journal of Science, v. 12, p. 134-167.Hatch, N.L., and Moench, R.H., 1984 [1985], Bedrock geologic map of the wilderness and roadless areas of the White Mountain National Forest, Coos, Carroll, and Grafton counties, New Hampshire: U.S. Geological Survey Miscellaneous Field Studies Map MF-1594-A, scale 1:125,000.https://pubs.er.usgs.gov/publication/mf1594A |
| NGMDB product | |
| Counties | Carroll - Grafton |