Structure of Trondhjemite Dikes in the Northfield Intrusive Complex

   In this project, Trondhjemite dikes are studied in the Northfield Intrusive Complex, an area of igneous intrusion ~3 miles southwest of Northfield, Vermont on Dole Hill. While previous studies focused mainly on geochemistry and petrology of these dikes, this study's main goal was to examine the relationship between these dikes and their host rock in order to better understand the conditions under which the Connecticut Valley Gaspe Basin in eastern Vermont opened. It was found that this section of the dike swarm, measured at 967 meters, runs in an in-echelon pattern with the dikes within, with segments of the overall swarm having different orientations that the dikes within their respective segments. These observations allow us to determine a possible pattern of intrusion within the existing rocks and conditions under which they intruded.