https://www.usgs.gov/publications/late-neoproterozoic-felsite-6023-2-ma-and-associated-metadiabase-dikes-reading-prong
Late Neoproterozoic felsite (602.3 +/- 2 Ma) and associated metadiabase dikes in the Reading Prong,...
Felsite dikes in the Rittenhouse Gap iron mine district of the Reading Prong, eastern Pennsylvania, have a close geochemical affinity with the peralkaline...