Ordovician quartz monzonite (hornblende accessory mineral)

Ordovician quartz monzonite (hornblende accessory mineral)
State Maine
Name Ordovician quartz monzonite (hornblende accessory mineral)
Geologic age Ordovician
Lithologic constituents
Major
Igneous > Plutonic > Syenitic > Quartz-monzonitehornblende-biotite quartz monzonite; U - Unmetamorphosed
Comments U - Unmetamorphosed
Stratigraphic units includes: 23 - Attean pluton (ME079, ME090, ME091, ME089).
References

Osberg, P.H., Hussey, A.M., and Boone, G.M., 1985, Bedrock geologic map of Maine: Maine Geological Survey, Dept. of Conserv., scale 1:500,000.

Faul, H., Stern, T.W., Thomas, H.H., and Elmore, P.L.D., 1963, Ages of intrusion and metamorphism in the northern Appalachians: Am. Jour. Sci., v. 261, 9. 1-19.

Zartman, R.E., Hurley, P.M., Kruger, H.W., and Giletti, B.J., 1970, A Permian disturbance of K-Ar radiometric ages in New England: its occurrence and causes: Geol. Soc. Amer., Bull., v. 81, p. 3359-3374.

Lyons, J.B., Zartman, R.E., and Aleinkoff, J.N., 1983, U-Pb ages of zircons from the Ordovician Highlandcroft plutonic suite and Silurian intrusives: Geol. Soc. Amer., Abs. with Prog., v. 15, p. 187.

Silver, L.T., pers. communication, in Boudette and Boone, 1976.

NGMDB product
Counties Somerset