Review of the geochemistry and metallogeny of approximately 1.4 Ga granitoid intrusions of the conterminous United States

Online link https://pubs.usgs.gov/sir/2017/5111/sir20175111.pdf
Description The conterminous United States hosts numerous volumetrically significant and geographically dispersed granitoid intrusions that range in age from 1.50 to 1.32 billion years before present (Ga). Although previously referred to as A-type granites, most are
Originators du Bray, Edward A.; Holm-Denoma, Christopher S.; Lund, Karen; and Premo, Wayne R.
Publication U.S. Geological Survey Scientific Investigations Report 2017-5111