Publications
The USGS publishes peer-reviewed reports and journal articles which are used by Chesapeake Bay Program resource managers and policy makers to make science-based decisions for ecosystem conservation and restoration. Use the Search box below to find publications on selected topics.
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Filter Total Items: 954
Microbial abundance in the deep subsurface of the Chesapeake Bay impact crater: Relationship to lithology and impact processes Microbial abundance in the deep subsurface of the Chesapeake Bay impact crater: Relationship to lithology and impact processes
Asteroid and comet impact events are known to cause profound disruption to surface ecosystems. The aseptic collection of samples throughout a 1.76-km-deep set of cores recovered from the deep subsurface of the Chesapeake Bay impact structure has allowed the study of the subsurface biosphere in a region disrupted by an impactor. Microbiological enumerations suggest the presence of three...
Authors
Charles S. Cockell, Aaron L. Gronstal, Mary A. Voytek, Julie D. Kirshtein, Kai Finster, Ward E. Sanford, Mihaela Glamoclija, Gregroy S. Gohn, David S. Powars, J. Wright Horton
Petrographic and geochemical comparisons between the lower crystalline basement-derived section and the granite megablock and amphibolite megablock of the Eyreville B core, Chesapeake Bay impact structure, USA Petrographic and geochemical comparisons between the lower crystalline basement-derived section and the granite megablock and amphibolite megablock of the Eyreville B core, Chesapeake Bay impact structure, USA
The Eyreville B core from the Chesapeake Bay impact structure, Virginia, USA, contains a lower basement-derived section (1551.19 m to 1766.32 m deep) and two megablocks of dominantly (1) amphibolite (1376.38 m to 1389.35 m deep) and (2) granite (1095.74 m to 1371.11 m deep), which are separated by an impactite succession. Metasedimentary rocks (muscovite-quartz-plagioclase-biotite...
Authors
G.N. Townsend, R.L. Gibson, J. Wright Horton, W.U. Reimold, R.T. Schmitt, K. Bartosova
Physical property data from the ICDP-USGS Eyreville cores A and B, Chesapeake Bay impact structure, Virginia, USA, acquired using a multisensor core logger Physical property data from the ICDP-USGS Eyreville cores A and B, Chesapeake Bay impact structure, Virginia, USA, acquired using a multisensor core logger
The International Continental Scientific Drilling Program (ICDP) and the U.S. Geological Survey (USGS) drilled three core holes to a composite depth of 1766 m within the moat of the Chesapeake Bay impact structure. Core recovery rates from the drilling were high (??90%), but problems with core hole collapse limited the geophysical downhole logging to natural-gamma and temperature logs...
Authors
H. A. Pierce, J.B. Murray
Megablocks and melt pockets in the Chesapeake Bay impact structure constrained by magnetic field measurements and properties of the Eyreville and Cape Charles cores Megablocks and melt pockets in the Chesapeake Bay impact structure constrained by magnetic field measurements and properties of the Eyreville and Cape Charles cores
We use magnetic susceptibility and remanent magnetization measurements of the Eyreville and Cape Charles cores in combination with new and previously collected magnetic field data in order to constrain structural features within the inner basin of the Chesapeake Bay impact structure. The Eyreville core shows the first evidence of several-hundred-meter-thick basement-derived megablocks...
Authors
A. K. Shah, D. L. Daniels, A. Kontny, J. Brozena
Comparison of clast frequency and size in the resurge deposits at the Chesapeake Bay impact structure (Eyreville A and Langley cores): Clues to the resurge process Comparison of clast frequency and size in the resurge deposits at the Chesapeake Bay impact structure (Eyreville A and Langley cores): Clues to the resurge process
Collapse and inward slumping of unconsolidated sedimentary strata expanded the Chesapeake Bay impact structure far beyond its central basement crater. During crater collapse, sediment-loaded water surged back to fill the crater. Here, we analyze clast frequency and granulometry of these resurge deposits in one core hole from the outermost part of the collapsed zone (i.e., Langley) as...
Authors
Jens Ormo, Erik Sturkell, J. Wright Horton,, David S. Powars, Lucy E. Edwards
Integrated sequence stratigraphy of the postimpact sediments from the Eyreville core holes, Chesapeake Bay impact structure inner basin Integrated sequence stratigraphy of the postimpact sediments from the Eyreville core holes, Chesapeake Bay impact structure inner basin
The Eyreville core holes provide the first continuously cored record of postimpact sequences from within the deepest part of the central Chesapeake Bay impact crater. We analyzed the upper Eocene to Pliocene postimpact sediments from the Eyreville A and C core holes for lithology (semiquantitative measurements of grain size and composition), sequence stratigraphy, and chronostratigraphy...
Authors
James V. Browning, Kenneth G. Miller, Peter P. McLaughlin, Lucy E. Edwards, Andrew A. Kulpecz, David S. Powars, Bridget S. Wade, Mark D. Feigenson, James D. Wright
Fractionation of stable isotopes in perchlorate and nitrate during in situ biodegradation in a sandy aquifer Fractionation of stable isotopes in perchlorate and nitrate during in situ biodegradation in a sandy aquifer
An in situ experiment was performed in a shallow alluvial aquifer in Maryland to quantify the fractionation of stable isotopes in perchlorate (Cl and O) and nitrate (N and O) during biodegradation. An emulsified soybean oil substrate that was previously injected into this aquifer provided the electron donor necessary for biological perchlorate reduction and denitrification. During the...
Authors
P.B. Hatzinger, John Karl Bohlke, N.C. Sturchio, B. Gu, L.J. Heraty, R.C. Borden
Regional nutrient trends in streams and rivers of the United States, 1993-2003 Regional nutrient trends in streams and rivers of the United States, 1993-2003
Trends in flow-adjusted concentrations (indicators of anthropogenic changes) and observed concentrations (indicators of natural and anthropogenic changes) of total phosphorus and total nitrogen from 1993 to 2003 were evaluated in the eastern, central, and western United States by adapting the Regional Kendall trend test to account for seasonality and spatial correlation. The only...
Authors
Lori A. Sprague, David L. Lorenz
The influence of microtopography on soil nutrients in created mitigation wetlands The influence of microtopography on soil nutrients in created mitigation wetlands
This study explores the relationship between microtopography and soil nutrients (and trace elements), comparing results for created and reference wetlands in Virginia, and examining the effects of disking during wetland creation. Replicate multiscale tangentially conjoined circular transects were used to quantify microtopography both in terms of elevation and by two microtopographic...
Authors
K.F. Moser, C. Ahn, G.B. Noe
Silicate glasses and sulfide melts in the ICDP-USGS Eyreville B core, Chesapeake Bay impact structure, Virginia, USA Silicate glasses and sulfide melts in the ICDP-USGS Eyreville B core, Chesapeake Bay impact structure, Virginia, USA
Optical and electron-beam petrography of melt-rich suevite and melt-rock clasts from selected samples from the Eyreville B core, Chesapeake Bay impact structure, reveal a variety of silicate glasses and coexisting sulfur-rich melts, now quenched to various sulfi de minerals (??iron). The glasses show a wide variety of textures, fl ow banding, compositions, devitrifi cation, and hydration...
Authors
H. E. Belkin, J. Wright Horton
Deep drilling in the Chesapeake Bay impact structure - An overview Deep drilling in the Chesapeake Bay impact structure - An overview
The late Eocene Chesapeake Bay impact structure lies buried at moderate depths below Chesapeake Bay and surrounding landmasses in southeastern Virginia, USA. Numerous characteristics made this impact structure an inviting target for scientific drilling, including the location of the impact on the Eocene continental shelf, its threelayer target structure, its large size (??85 km diameter)...
Authors
G. S. Gohn, C. Koeberl, K.G. Miller, W.U. Reimold
Pesticides in Ground Water of Central and Western Maryland Pesticides in Ground Water of Central and Western Maryland
Selected pesticides and degradates (products of pesticide degradation) are detectable in ground water in many parts of central and western Maryland, although concentrations are generally less than 0.1 micrograms per liter. Ground-water samples collected recently (1994-2003) from 72 wells in areas of Maryland underlain by consolidated carbonate, crystalline, or siliciclastic aquifers...
Authors
Scott W. Ator, Betzaida Reyes