Maromas Granite Gneiss (CTDm;0)

Maromas Granite Gneiss

Light-gray to buff, medium- to fine-grained granitic gneiss, composed of quartz and microcline with minor plagioclase and biotite. Central body is massive, but outlying strips are foliated and have accessory hornblende or garnet. Massive parts may be young anatectic intrusive rocks; foliated parts may include older felsic metavolcanic rocks belonging to unit Ochv. Pegmatite bodies are common in the vicinity.

State	Connecticut
Name	Maromas Granite Gneiss
Geologic age	Devonian?
Lithologic constituents	Major Metamorphic > GneissLight-gray to buff, medium- to fine-grained granitic gneiss, composed of quartz and microcline with minor plagioclase and biotite. Central body is massive, but outlying strips are foliated and have accessory hornblende or garnet. Massive parts may be young anatectic intrusive rocks; foliated parts may include older felsic metavolcanic rocks belonging to unit Ochv. Incidental Metamorphic > Metaigneous > Metavolcanicfoliated parts may include older felsic metavolcanic rocks belonging to unit Ochv Igneous > Plutonic > Granitic > Leucocratic-granitic > PegmatitePegmatite bodies are common in the vicinity.
Comments	Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Bronson Hill Anticlinorium
References	Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000.
NGMDB product	NGMDB product page for 54245
Counties	Middlesex

Maromas Granite Gneiss

Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000.