Deep drilling into the Chesapeake Bay impact structure

G. S. Gohn, C. Koeberl, K. G. Miller, W. U. Reimold, J. V. Browning, C. S. Cockell, J. W. Horton, T. Kenkmann, A. A. Kulpecz, D. S. Powars, W. E. Sanford, M. A. Voytek, Charles Cockell

Research output: Contribution to journalArticlepeer-review

Abstract

Samples from a 1.76- kilometer- deep corehole drilled near the center of the late Eocene Chesapeake Bay impact structure ( Virginia, USA) reveal its geologic, hydrologic, and biologic history. We conducted stratigraphic and petrologic analyses of the cores to elucidate the timing and results of impact- melt creation and distribution, transient- cavity collapse, and ocean- water resurge. Comparison of post- impact sedimentary sequences inside and outside the structure indicates that compaction of the crater fill influenced long- term sedimentation patterns in the mid- Atlantic region. Salty connate water of the target remains in the crater fill today, where it poses a potential threat to the regional groundwater resource. Observed depth variations in microbial abundance indicate a complex history of impact- related thermal sterilization and habitat modification, and subsequent post- impact repopulation.

Original languageEnglish
Pages (from-to)1740-1745
Number of pages6
JournalScience
Volume320
Issue number5884
DOIs
Publication statusPublished - 27 Jun 2008

Keywords

  • GLOBAL SEA-LEVEL
  • SUBSEAFLOOR SEDIMENTS
  • BOLIDE IMPACT
  • YAXCOPOIL-1
  • CHICXULUB
  • ORIGIN
  • LIFE

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