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Hornblende granodiorite

Hornblende granodiorite.
StateNew Hampshire
NameHornblende granodiorite
Geologic ageLate Ordovician
Original map labelOo2h
CommentsPart of the Oliverian Plutonic Suite (Late Ordovician) - Pink, weakly to moderately foliated, locally porphyritic biotite granitoids found in mantled gneiss domes. Mafic varieties contain hornblends. Variably metamorphosed up to amphibolite facies. Landaff dome intrusive rocks of Oliverian Plutonic Suite = 444+/-8 U/Pb per NH020. 447+/-4 U/Pb per J.N. Aleinikoff, oral commun., Feb. 1994.
Primary rock typegranodiorite
Secondary rock type
Other rock types
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granodiorite (Pluton)hornblende granodiorite
Map references
Bennett, D. S, , Wittkop, C.A., and Dicken, C.L., 2006 , Bedrock Geologic Map of New Hampshire - A Digital Representation of the Lyons and others 1997 map and ancillary files: U.S. Geological Survey Data Series 215, scale 1:250,000, CD-ROM.
Unit 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, 1:250,000, 2 sheets.
Zartman, R.E., and Leo, G.W., 1985, New radiometric ages on gneisses of the Oliverian domes in New Hampshire and Massachusetts: American Journal of Science, v. 285, p. 267-280.
Geographic coverageGrafton

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