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

GSA Special Papers

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

Author(s)

Geological Society of America

Volume

458

DOI:

https://doi.org/10.1130/SPE458

Copyright:

© 2009 Geological Society of America

Attribution:You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Noncommercial - you may not use this work for commercial purpose. No Derivative works - You may not alter, transform, or build upon this work. Sharing - Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science.

ISBN print:

9780813724584

Publication date:

January 01, 2009

Book Chapter

The record of ground zero in the Chesapeake Bay impact crater—Suevites and related rocks

Author(s)

A. Wittmann

Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston, Texas 77058, USA

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W.U. Reimold

Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Invalidenstrasse 43, 10115 Berlin, Germany

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R.T. Schmitt

Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Invalidenstrasse 43, 10115 Berlin, Germany

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L. Hecht

Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Invalidenstrasse 43, 10115 Berlin, Germany

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T. Kenkmann

Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Invalidenstrasse 43, 10115 Berlin, Germany

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Doi:

https://doi.org/10.1130/2009.2458(16)

Published:

January 01, 2009

The International Continental Scientific Drilling Program (ICDP)–U.S. Geological Survey (USGS) Eyreville boreholes through the annular moat of the Chesapeake Bay crater recovered polymict impact breccias and associated rocks from the depth range of 1397–1551 m. These rocks record cratering processes before burial beneath resurge deposits. Quantitative analyses of clast sizes, matrix contents, and distribution of impact melt reveal a shock metamorphic gradient in these impactites. The reason for the low estimated quantity of impact melt in the crater (~10 km³) remains elusive. Possible causes may relate to increased excavation efficiency due to a high ratio of water column...

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