Ascutney Mountain stock – syenite

Syenite-porphyrite to sericite-perthite-hornblende-biotite syenite; contains minor fayalite, augite, and quartz; occurs as a partial ring dike in the Little Ascutney stock. Part of the White Mountain Igneous Suite; Ascutney Mountain igneous complex - Consists of two plutons, a partial ring dike, and screens of volcanic rocks. K-Ar ages of 122 to 120 Ma (Foland and Faul, 1977).
State Vermont
Name Ascutney Mountain stock – syenite
Geologic age Early Cretaceous
Lithologic constituents
Major
Igneous > Plutonic > Syenitic > Syenite (Stock or pipe)Syenite-porphyrite to sericite-perthite-hornblende-biotite syenite; contains minor fayalite, augite, and quartz; occurs as a partial ring dike in the Little Ascutney stock.
References
NGMDB product
Counties Windsor