Journal Highlights

Exploring hypotheses for thick crust under the Illinois Basin

Editor’s Highlight—


This paper presents a receiver function study of crustal thickness variations across the Illinois Basin and beyond using a high-density seismic array funded through EarthScope. This detailed look shows thicker crust and larger variations than previously recognized. The authors present several possible models to explain the variations in thickness with a preferred model of underplating during the emplacement of the Eastern Granite-Rhyolite Province around 1.3 billion years ago. Overall this presents new data and a new perspective on a complicated and, as yet, poorly-understood region.