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Diorite

Diorite - Medium-grained hornblende diorite metamorphosed in part to amphibolite and hornblende gneiss.
StateMassachusetts
NameDiorite
Geologic ageProterozoic Z
Original map labelZdi
CommentsPart of Milford-Dedham Zone (Tertiary and Older Rocks)
Primary rock typediorite
Secondary rock typeamphibolite
Other rock typesmafic gneiss
Lithologic constituents
Major
Igneous > Plutonic > Dioritic > DioriteMedium-grained hornblende diorite.
Minor
Metamorphic > Gneissmetamorphosed in part to amphibolite and hornblende gneiss
Metamorphic > Amphibolitemetamorphosed in part to amphibolite and hornblende gneiss
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 coverageBristol - Middlesex - Norfolk - Plymouth

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