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High-resolution seismic-reflection images across the ICDP-USGS Eyreville deep drilling site, Chesapeake Bay impact structure

By
David S. Powars
David S. Powars
U.S. Geological Survey, 926A National Center, Reston, Virginia 20192, USA
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Rufus D. Catchings
Rufus D. Catchings
U.S. Geological Survey, 345 Middlefield Road, MS 977, Menlo Park, California 94025, USA
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Mark R. Goldman
Mark R. Goldman
U.S. Geological Survey, 345 Middlefield Road, MS 977, Menlo Park, California 94025, USA
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Gregory S. Gohn
Gregory S. Gohn
U.S. Geological Survey, 926A National Center, Reston, Virginia 20192, USA
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J. Wright Horton, Jr.
J. Wright Horton, Jr.
U.S. Geological Survey, 926A National Center, Reston, Virginia 20192, USA
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Lucy E. Edwards
Lucy E. Edwards
U.S. Geological Survey, 926A National Center, Reston, Virginia 20192, USA
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Michael J. Rymer
Michael J. Rymer
U.S. Geological Survey, 345 Middlefield Road, MS 977, Menlo Park, California 94025, USA
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Gini Gandhok
Gini Gandhok
U.S. Geological Survey, 345 Middlefield Road, MS 977, Menlo Park, California 94025, USA
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Published:
January 01, 2009

The U.S. Geological Survey (USGS) acquired two 1.4-km-long, high-resolution (~5 m vertical resolution) seismic-reflection lines in 2006 that cross near the International Continental Scientific Drilling Program (ICDP)–USGS Eyreville deep drilling site located above the late Eocene Chesapeake Bay impact structure in Virginia, USA. Five-meter spacing of seismic sources and geophones produced high-resolution images of the subsurface adjacent to the 1766-m-depth Eyreville core holes. Analysis of these lines, in the context of the core hole stratigraphy, shows that moderate-amplitude, discontinuous, dipping reflections below ~527 m correlate with a variety of Chesapeake Bay impact structure sediment and rock breccias recovered in the cores. High-amplitude, continuous, subhorizontal reflections above ~527 m depth correlate with the uppermost part of the Chesapeake Bay impact structure crater-fill sediments and postimpact Eocene to Pleistocene sediments. Reflections with ~20–30 m of relief in the uppermost part of the crater-fill and lowermost part of the postimpact section suggest differential compaction of the crater-fill materials during early postimpact time. The top of the crater-fill section also shows ~20 m of relief that appears to represent an original synimpact surface. Truncation surfaces, locally dipping reflections, and depth variations in reflection amplitudes generally correlate with the lithostrati-graphic and sequence-stratigraphic units and contacts in the core. Seismic images show apparent postimpact paleochannels that include the first possible Miocene paleochannels in the Mid-Atlantic Coastal Plain. Broad downwarping in the postim-pact section unrelated to structures in the crater fill indicates postimpact sediment compaction.

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GSA Special Papers

The ICDP-USGS Deep Drilling Project in the Chesapeake Bay impact structure: Results from the Eyreville Core Holes

Gregory S. Gohn
Gregory S. Gohn
U.S. Geological Survey, Reston, Virginia, USA
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Christian Koeberl
Christian Koeberl
Department of Earth & Planetary Sciences, Rutgers University, USA
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Kenneth G. Miller
Kenneth G. Miller
Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Germany
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Wolf Uwe Reimold
Wolf Uwe Reimold
Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Germany
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Geological Society of America
Volume
458
ISBN print:
9780813724584
Publication date:
January 01, 2009

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