Comerford Intrusive Complex

Foliated to nonfoliated, fine-grained to pegmatitic metagabbro, metadiorite, and metatonalite; aplitic metatonalite; and metadiabase. U-Pb zircon ages of pegmatitic metadiorite from three bodies (Comerford quarry, Leighton Hill, and Peaked Mountain) are, respectively, 419.8±2.6 Ma, no. 33; 419.3±1.3 Ma, no. 34; and 418.5±2.0 Ma, no. 35 (Rankin and others, 2007). Part of the Lake Memphremagog Intrusive Suite (425±3 Ma to 418.5±2 Ma).
State Vermont
Name Comerford Intrusive Complex
Geologic age Late Silurian
Lithologic constituents
Major
Metamorphic > Metaigneous > Metaintrusive > MetatonaliteFoliated to nonfoliated, fine-grained to pegmatitic metagabbro, metadiorite, and metatonalite; aplitic metatonalite; and metadiabase.
Metamorphic > Metaigneous > Metaintrusive > MetagabbroFoliated to nonfoliated, fine-grained to pegmatitic metagabbro, metadiorite, and metatonalite; aplitic metatonalite; and metadiabase.
Metamorphic > Metaigneous > Metaintrusive > MetadioriteFoliated to nonfoliated, fine-grained to pegmatitic metagabbro, metadiorite, and metatonalite; aplitic metatonalite; and metadiabase.
Minor
Metamorphic > Metaigneous > Metaintrusive > MetadiabaseFoliated to nonfoliated, fine-grained to pegmatitic metagabbro, metadiorite, and metatonalite; aplitic metatonalite; and metadiabase.
References
NGMDB product