Skip to Main Content
Book Chapter

Physical rock properties of the Eyreville core, Chesapeake Bay impact structure

By
Sibylle I. Mayr
Sibylle I. Mayr
Fachgebiet Angewandte Geophysik, Technische Universität Berlin, Sekr. ACK 2, Ackerstrasse 71-76, D-13355 Berlin, Germany
Search for other works by this author on:
Hans Burkhardt
Hans Burkhardt
Fachgebiet Angewandte Geophysik, Technische Universität Berlin, Sekr. ACK 2, Ackerstrasse 71-76, D-13355 Berlin, Germany
Search for other works by this author on:
Yuri Popov
Yuri Popov
Russian State Geological Prospecting University, 23 Miklukho-Maklai Street, Moscow, 117997, Russia
Search for other works by this author on:
Raissa Romushkevich
Raissa Romushkevich
Russian State Geological Prospecting University, 23 Miklukho-Maklai Street, Moscow, 117997, Russia
Search for other works by this author on:
Dmitry Miklashevskiy
Dmitry Miklashevskiy
Russian State Geological Prospecting University, 23 Miklukho-Maklai Street, Moscow, 117997, Russia
Search for other works by this author on:
Denis Gorobtsov
Denis Gorobtsov
Russian State Geological Prospecting University, 23 Miklukho-Maklai Street, Moscow, 117997, Russia
Search for other works by this author on:
Philipp Heidinger
Philipp Heidinger
Geophysical Institute, Universität Karlsruhe, Hertzstrasse 16, 76187 Karlsruhe, Germany
Search for other works by this author on:
Helmut Wilhelm
Helmut Wilhelm
Geophysical Institute, Universität Karlsruhe, Hertzstrasse 16, 76187 Karlsruhe, Germany
Search for other works by this author on:
Published:
January 01, 2009

The physical properties of rocks in drill core from impact structures can be used to distinguish individual nonimpact and impact-generated lithologies, and to investigate the effect of the impact process on the target rocks. Here, we present the results of laboratory measurements of porosity, density, velocity, and thermal properties on the densely sampled cores from the Eyreville borehole in the Chesapeake Bay impact structure, USA. With increasing depth, the lithologies encountered (and porosities) are: postimpact sediments (40%–60%), Exmore breccia and sedimentary blocks (27%–44%), a large megablock of granitoids (<1%), suevite and polymict lithic impact breccia (1%–25%), and schist, granite, and pegmatite of the basement-derived section (1%–13%). The low bulk densities and thermal properties of the post-impact sediments show a good correlation with the high porosity values. The physical properties within the Exmore bed sequence overall display relatively small variation but are heterogeneous on the core sample scale. Physical properties along the impact-breccia sequence are highly variable on all scales, and they are interpreted to be controlled by the structural arrangement of particles as well as by the highly variable mineral and clast compositions of the samples. The physical properties of the rocks of the lowermost basement-derived section are also heterogeneous and are interpreted as having been influenced by both lithology and overprinting as a result of the impact process. These results are important for further lithological and petrophysical interpretation and for calibrating future geophysical models of the Chesapeake Bay impact structure.

You do not currently have access to this article.

Figures & Tables

Contents

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
Search for other works by this author on:
Christian Koeberl
Christian Koeberl
Department of Earth & Planetary Sciences, Rutgers University, USA
Search for other works by this author on:
Kenneth G. Miller
Kenneth G. Miller
Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Germany
Search for other works by this author on:
Wolf Uwe Reimold
Wolf Uwe Reimold
Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Germany
Search for other works by this author on:
Geological Society of America
Volume
458
ISBN print:
9780813724584
Publication date:
January 01, 2009

References

Related

Citing Books via

A comprehensive resource of eBooks for researchers in the Earth Sciences

Related Articles
Related Book Content
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal