Gabbro

Hornblende gabbro and hornblende-pyroxene gabbro metamorphosed in part to hornblende gneiss and amphibolite.
State Massachusetts
Name Gabbro
Geologic age Proterozoic Z
Lithologic constituents
Major
Igneous > Plutonic > Gabbroic > Gabbrohornblende gabbro and hornblende-pyroxene gabbro
Incidental
Metamorphic > Gneiss > Hornblende-gneissmetamorphosed in part to hornblende gneiss and amphibolite
Metamorphic > Amphibolitemetamorphosed in part to hornblende gneiss and amphibolite
Comments Part of Milford-Dedham Zone (Tertiary and Older Rocks)
References
NGMDB product
Counties Middlesex - Norfolk