Conference Papers
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Preliminary-assessment and upgrade of a groundwater flow model of the Seacoast Bedrock Aquifer, New Hampshire Preliminary-assessment and upgrade of a groundwater flow model of the Seacoast Bedrock Aquifer, New Hampshire
In 2003 and 2004, the U.S. Geological Survey investigated the availability of groundwater resources in a 160-square mile area of coastal New Hampshire (Figure 1) using a regional groundwater flow model (Mack, 2009). At that time, population growth and increasing water demand prompted concern for the sustainability of the region’s groundwater resources in a fractured-crystalline bedrock...
Authors
Thomas J. Mack
Preliminary assessment of porphyry copper deposits in the Sierra Maestra, Cuba Preliminary assessment of porphyry copper deposits in the Sierra Maestra, Cuba
The U.S. Geological Survey’s “three-step” form of mineral-resource assessment was used to obtain a preliminary estimate of copper resources in undiscovered porphyry deposits of the Paleogene Sierra Maestra Arc. Results of this preliminary assessment suggest that a mean of 3.2 undiscovered deposits are likely present. This estimate is comparable to results from an independently-derived...
Authors
Lukas Zurcher, Floyd Gray, Timothy Hayes, Greta J. Orris, Mark E. Gettings, Mark D. Cocker, Leila Gass
Analysis of artificially matured shales with confocal laser scanning raman microscopy: Applications to organic matter characterization Analysis of artificially matured shales with confocal laser scanning raman microscopy: Applications to organic matter characterization
Raman spectroscopy has been suggested as a method for characterizing the thermal maturity of rocks. The literature contains many empirical correlations between thermal maturity proxies, such as vitrinite reflectance (VRo) and pyrolysis-Tmax, with spectral metrics such as Raman peak-widths, peak-center positions, peak-areas and all manner of differences and ratios of these parameters...
Authors
Grant A. Myers, Kelsey Kehoe, Paul C. Hackley
Analysis of the age and paleomagnetic orientation of the Broadwell Mesa Basalt, Bristol Mountains, CA Analysis of the age and paleomagnetic orientation of the Broadwell Mesa Basalt, Bristol Mountains, CA
To add to the regional paleomagnetic data documenting block rotation in eastern California, we determined the age and paleomagnetic rotation of the Broadwell Mesa basalt, a basalt in the Bristol Mountains, CA as part of an effort to constrain the timing and rotation of blocks adjacent to the fault. The east-striking sinistral Broadwell Mesa fault cuts and separates the basalt into two...
Authors
Geoffrey Phelps, John Hillhouse, Robert J. Fleck, David M. Miller, David C. Buesch, Andrew J. Cyr, Kevin M. Schmidt
Spectral properties of anhydrous carbonates and nitrates Spectral properties of anhydrous carbonates and nitrates
No abstract available.
Authors
J.L. Bishop, S.J. King, M.D. Lane, B. Lafuente, A. J. Brown, T. Hiroi, Gregg A. Swayze, J.-F. Lin
Using enteric pathogens to assess sources of fecal contamination in the Silurian Dolomite Aquifer: Preliminary results Using enteric pathogens to assess sources of fecal contamination in the Silurian Dolomite Aquifer: Preliminary results
The fractured Silurian dolomite aquifer is an important, but vulnerable, source of drinking water in northeast Wisconsin (Sherrill in Geology and ground water in Door County, Wisconsin, with emphasis on contamination potential in the Silurian dolomite, 1978; Bradbury and Muldoon in Hydrogeology and groundwater monitoring of fractured dolomite in the Upper Door Priority Watershed, Door...
Authors
Maureen A. Muldoon, Mark A. Borchardt, Susan K. Spencer, Randall J. Hunt, David W. Owens
New method to integrate remotely sensed hydrothermal alteration mapping into quantitative mineral resource assessments New method to integrate remotely sensed hydrothermal alteration mapping into quantitative mineral resource assessments
Hydrothermal alteration data mapped using the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) were compiled into hydrothermal alteration polygons for use in an assessment of porphyry copper mineral resource potential in the southwestern United States. Hydrothermal alteration polygons along with geochemistry, gravity and magnetic, lithologic, and deposit and...
Authors
John C. Mars, Jane M. Hammarstrom, Gilpin R. Robinson, Stephen Ludington, Lukas Zurcher, Helen W. Folger, Mark E. Gettings, Federico Solano, Thomas Kress
Effect of stocking and biotic and abiotic factors on Muskellunge recruitment in northern Wisconsin lakes Effect of stocking and biotic and abiotic factors on Muskellunge recruitment in northern Wisconsin lakes
The Muskellunge Esox masquinongy is an important recreational fish species in North America. Some populations of Muskellunge are in decline, despite a reduction in harvest by anglers due largely to a growing catch-and-release ethic. Our objectives were to determine if Muskellunge recruitment was influenced by stocking, biotic factors, and abiotic factors in northern Wisconsin lakes. To...
Authors
Todd S. Caspers, Michael J. Hansen, Steven W. Hewett
Iron isotope systematics of shale-derived soils as potentially influenced by small mineral particle loss Iron isotope systematics of shale-derived soils as potentially influenced by small mineral particle loss
Loss of small mineral particles from soil has been suggested as a process that can produce net isotopic fractionation in the remaining soil. We extracted water dispersible colloids (WDCs) from bulk soil collected at the Susquehanna/Shale Hills Critical Zone Observatory (SSHO) and measured their Fe isotopic composition for comparison to published data from the site. The goal was to...
Authors
Carleton R. Bern, Tiffany Yesavage, Michael J. Pribil
Geomechanical analysis of initial stage of gas production from interbedded hydrate-bearing sediment Geomechanical analysis of initial stage of gas production from interbedded hydrate-bearing sediment
Geomechanical stability of marine hydrate reservoirs during gas production by depressurization is the focus of this study. The reservoir considered here consists of thin hydrate rich sandy layers interbedded with mud layers. Because of the input parameter uncertainties involved, it is prudent from a geomechanical perspective to estimate the likely bounds of potential responses. A...
Authors
Jeen-Shang Lin, Shun Uchida, Evgeniy Myshakin, Yongkoo Seol, Jonny Rutqvist, Ray Boswell, William F. Waite, Junbong Jang, Timothy S. Collett
Geophysical characterization of seismic station sites in the United States – The importance of a flexible, multi-method approach Geophysical characterization of seismic station sites in the United States – The importance of a flexible, multi-method approach
Noninvasive geophysical site characterization methods were used in two recent projects to obtain shear-wave velocity (VS) profiles to a minimum depth of 30 m and the time-averaged VS of the upper 30 meters (VS30) at seismic station sites. These projects include the 2009 American Recovery and Reinvestment Act (ARRA) funded U.S. Geological Survey site characterization project for 191 sites...
Authors
Antony Martin, Alan Yong, William J. Stephenson, J. Boatwright, John Diehl
Assessment of leech lake strain muskellunge stocking in Lake Wissota, Wisconsin Assessment of leech lake strain muskellunge stocking in Lake Wissota, Wisconsin
No abstract available.
Authors
Joseph Gerbyshak, Wesley Larson, Keith N. Turnquist