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Biotite-hornblende diorite and quartz-bearing diorite

Biotite-hornblende diorite and quartz-bearing diorite - Mostly foliated; intrudes Dl.
StateMassachusetts
NameBiotite-hornblende diorite and quartz-bearing diorite
Geologic ageDevonian
Original map labelDdi
CommentsPart of Merrimack Belt (Silurian, Devonian and Pennsylvanian Rocks)
Primary rock typediorite
Secondary rock typequartz diorite
Other rock types
Lithologic constituents
Major
Igneous > Plutonic > Dioritic > DioriteBiotite-hornblende diorite and quartz-bearing diorite
Map references
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Unit references
Zen, E-An (ed.), Goldsmith, R. (comp.), Ratcliffe, N.M. (comp.), Robinson, P. (comp.), Stanley, R.S. (comp.), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.
Geographic coverageFranklin - Hampden - Worcester

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