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Impact effects and regional tectonic insights: Backstripping the Chesapeake Bay impact structure

¹ Department of Geosciences, Western Michigan University, 1187 Rood Hall, 1903 W. Michigan Avenue, Kalamazoo, Michigan 49008, USA
² United States Geological Survey, National Center, Reston, Virginia 20192, USA
³ Department of Geosciences, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA

Correspondence: *E-mail: t4hayden{at}wmich.edu.

The Chesapeake Bay impact structure is a ca. 35.4 Ma crater located on the eastern seaboard of North America. Deposition returned to normal shortly after impact, resulting in a unique record of both impact-related and subsequent passive margin sedimentation. We use backstripping to show that the impact strongly affected sedimentation for 7 m.y. through impact-derived crustalscale tectonics, dominated by the effects of sediment compaction and the introduction and subsequent removal of a negative thermal anomaly instead of the expected positive thermal anomaly. After this, the area was dominated by passive margin thermal subsidence overprinted by periods of regional-scale vertical tectonic events, on the order of tens of meters. Loading due to prograding sediment bodies may have generated these events.

Key Words: impact processes • passive margin • Chesapeake Bay • tectonics • Eocene • backstripping

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