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Diorite at Goff Ledges

Diorite at Goff Ledges - Diorite at Goff Ledges (Ogd) and similar diorite (Od) in the Windsor quadrangle. Very coarse-grained to pegmatitic, slightly foliated hornblende-plagioclase diorite, minor hornblende pyroxenite. Ogd intrudes CAZh and CAZhk. Od intrudes the Rowe Schist of the Rowe-Hawley zone.
StateMassachusetts
NameDiorite at Goff Ledges
Geologic ageOrdovician
Original map labelOgd
CommentsPart of Taconic-Berkshire Zone (Ordovician and Older Rocks)
Primary rock typediorite
Secondary rock typepyroxenite
Other rock types
Lithologic constituents
Major
Igneous > Plutonic > Dioritic > DioriteVery coarse-grained to pegmatitic, slightly foliated hornblende-plagioclase diorite.
Minor
Igneous > Plutonic > Ultramafic > Pyroxeniteminor hornblende pyroxenite
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 coverageHampden

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=MAOgd;0
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