Overview

This volume synthesizes 16 years of geological and geophysical studies which document an 85-km-wide impact crater buried 500 m beneath Chesapeake Bay in south eastern Virginia, USA. The authors integrate extensive seismic reflection profiling and deep core drilling to analyze the structure, morphology, gravimetrics, sedimentology, petrology, geochemistry, and paleontology of this submarine structure. Of special interest are a detailed comparison with other terrestrial and extraterrestrial craters, as well as a conceptual model and computer simulation of the impact. The extensive illustrations encompass more than 150 line drawings and core photographs. An accompanying CD-ROM includes selected seismic profiles, scaled cross sections, detailed maps, and downhole geophysical logs.

Full Product Details

Author:   Wylie Poag ,  Christian Koeberl ,  Wolf Uwe Reimold
Publisher:   Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
Imprint:   Springer-Verlag Berlin and Heidelberg GmbH & Co. K
Edition:   2004
Dimensions:   Width: 15.50cm , Height: 3.30cm , Length: 23.50cm
Weight:   1.068kg
ISBN:  

9783540404415

ISBN 10:   3540404414
Pages:   523
Publication Date:   09 September 2003
Audience:   Professional and scholarly ,  Professional & Vocational
Format:   Hardback
Publisher's Status:   Active
Availability:   Out of stock  
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Table of Contents

1 Introduction.- 2 Geological Framework of Impact Site.- 2.1 Crystalline Basement Rocks.- 2.2 Coastal Plain Sedimentary Rocks.- 2.3 Sequence Stratigraphy.- 2.4 Paleogeography of Impact Site.- 2.5 Subsidence of Virginia Continental Margin.- 2.6 Initial Evidence of East Coast Impact.- 2.7 Onshore Borehole Evidence.- 3 Geophysical Framework of Impact Site.- 3.1 Seismic Investigations of Virginia Coastal Plain.- 3.2 Seismic Signature of Crystalline Basement Rocks.- 3.3 Chesapeake Bay Seismic Reflection Profiles.- 3.4 Depth Conversion of Seismic Two-way Traveltimes.- 3.5 Gravity Evidence.- 4 The Primary Crater.- 4.1 Crater Structure and Morphology.- 5 Secondary Craters.- 5.1 Location and Identification.- 5.2 Secondary Craters on Profile T-1-CB.- 5.3 Secondary Craters on Profile T-11-PR.- 5.4 Implications of Secondary Crater Record.- 6 Synimpact Crater-Fill Deposits.- 6.1 Oldest Breccia Unit.- 6.2 Displaced Megablocks.- 6.3 The Exmore Breccia.- 7 Initial Postimpact Deposits.- 7.1 Depositional Setting.- 7.2 Dead Zone.- 7.3 Chickahominy Formation.- 8 Age of Chesapeake Bay Impact Crater.- 8.1 Biochronology.- 8.2 Radiometric Chronology.- 8.3 Magnetochronology.- 8.4 Correlation with Other Craters and Impactites.- 9 Geological Consequences of Chesapeake Bay Impact.- 9.1 General Nature of Consequences.- 9.2 Reconfigured Basement Structure and Morphology.- 9.3 Disruption of Preimpact Sedimentary Column.- 9.4 Source of North AmericanTektite Strewn Field.- 9.5 Far-Field Seismic Effects.- 10 Comparisons with Other Impact Craters.- 10.1 Terrestrial Craters.- 10.2 Extraterrestrial Craters.- 10.3 Comparison with Chicxulub Multiring Impact Basin.- 11 Comparisons Between Impactites.- 11.1 Terrestrial Impactites.- 11.2 Flowin, Fallout, and Dead Zone.- 11.3 Other Intrabreccia Bodies.- 11.4 Continuous Ejecta Blankets.- 11.5 Secondary Breccias.- 11.6 Strewn Fields.- 11.7 Impact Melt Rocks.- 12 Implications for Impact Models.- 12.1 General Conceptual Models and Scaling Relations.- 12.2 Conceptual Model for Chesapeake Bay Crater.- 12.4 General Conceptual Model of Crater-Fill Deposition.- 12.4 Differentiating Crater-Fill Lithofacies at Chesapeake Bay.- 12.5 Comparison of Models.- 13 Biospheric Effects of Chesapeake Bay Impact.- 13.1 Local Paleoenvironmental Effects.- 13.2 Possible Global Paleoenvironmental Effects.- 14 Residual Effects of Chesapeake Bay Impact..- 14.1 Hypersaline Groundwater.- 14.2 Near-Surface Compaction Faults.- 14.3 Surface Expression of Crater.- 14.4 Altered River Courses.- 14.5 Relative Change of Sea Level.- 15 Summary and Conclusions.- 453.- 461.- 489.

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