Publications
Listed below are publication products directly associated with the Geology, Energy & Minerals Science Center:
Filter Total Items: 1167
The Sudbury impact layer in the paleoproterozoiciron ranges of northern Michigan, USA
A layer of breccia that contains fragments of impact ejecta has been found at 10 sites in the Paleoproterozoic iron ranges of northern Michigan, in the Lake Superior region of the United States. Radiometric age constraints from events predating and postdating deposition of the breccia are ca. 1875 Ma and 1830 Ma. The major bolide impact that occurred at 1850 Ma at Sudbury, Ontario, 500–700 km east
Authors
W. F. Cannon, K. J. Schulz, J. Wright Horton, David A. King
Mineralogy and the release of trace elements from slag from the Hegeler Zinc smelter, Illinois (USA)
Slag from the former Hegeler Zn-smelting facility in Illinois (USA) is mainly composed of spinifex Ca-rich plagioclase, fine-grained dendritic or coarse-grained subhedral to anhedral clinopyroxenes, euhedral to subhedral spinels, spherical blebs of Fe sulfides, silicate glass, and less commonly fayalitic olivine. Mullite and quartz were also identified in one sample as representing remnants of the
Authors
Nadine M. Piatak, Robert R. Seal
Preemption games: theory and experiment
El Mutún, perhaps the world's largest remaining iron ore deposit, was opened to private investors in the 1980s but, due to the high cost of developing the remote Bolivian site, there were no takers for two decades. In late 2005, spurred by rising commodity prices, the Brazilian company EBX finally seized the opportunity, preempting rivals based in China and India. Numerous similar examples can be
Authors
Steven T. Anderson, Daniel Friedman, Ryan Oprea
Mineralogical and chemical characteristics of some natural jarosites
This paper presents a detailed study of the mineralogical, microscopic, thermal, and spectral characteristics of jarosite and natrojarosite minerals. Systematic mineralogic and chemical examination of a suite of 32 natural stoichiometric jarosite and natrojarosite samples from diverse supergene and hydrothermal environments indicates that there is only limited solid solution between Na and K at lo
Authors
George A. Desborough, Kathleen S. Smith, Heather A. Lowers, Gregg A. Swayze, Jane M. Hammarstrom, Sharon F. Diehl, Reinhard W. Leinz, Rhonda L. Driscoll
Book review: Hollowed ground—Copper mining and community building on Lake Superior, 1840s–1990s
In 1843, six years before the Forty-niners headed west for the goldfields of California, the United States’ first great mineral rush began to a land that was, as Patrick Henry told Congress, “beyond the most distant wilderness and remote as the moon.” He was referring to the Keweenaw Peninsula of northern Michigan. This rush was not for gold or silver, but for copper. And not just any copper, but
Authors
Klaus J. Schulz
Coupled hydrology and biogeochemistry of Paleocene–Eocene coal beds, northern Gulf of Mexico
Thirty-six formation waters, gas, and microbial samples were collected and analyzed from natural gas and oil wells producing from the Paleocene to Eocene Wilcox Group coal beds and adjacent sandstones in north-central Louisiana, USA, to investigate the role hydrology plays on the generation and distribution of microbial methane. Major ion chemistry and Cl−Br relations of Wilcox Group formation wat
Authors
Jennifer C. McIntosh, Peter D. Warwick, Anna M. Martini, Stephen G. Osborn
Geologic controls on thermal maturity patterns in Pennsylvanian coal-bearing rocks in the Appalachian basin
Thermal maturation patterns of Pennsylvanian strata in the Appalachian basin were determined by
compiling and contouring published and unpublished vitrinite reflectance (VR) measurements. VR isograd
values range from 0.6% in eastern Ohio and eastern Kentucky (western side of the East Kentucky coal field) to
greater than 5.5% in eastern Pennsylvania (Southern Anthracite field, Schuylkill County), c
Authors
Leslie F. Ruppert, James C. Hower, Robert T. Ryder, Jeffrey R. Levine, Michael H. Trippi, William C. Grady
CO2, CO, and Hg emissions from the Truman Shepherd and Ruth Mullins coal fires, eastern Kentucky, USA
Carbon dioxide (CO2), carbon monoxide (CO), and mercury (Hg) emissions were quantified for two eastern Kentucky coal-seam fires, the Truman Shepherd fire in Floyd County and the Ruth Mullins fire in Perry County. This study is one of the first to estimate gas emissions from coal fires using field measurements at gas vents. The Truman Shepherd fire emissions are nearly 1400 t CO2/yr and 16 kg Hg/yr
Authors
Jennifer M.K. O'Keefe, Kevin R. Henke, James C. Hower, Mark A. Engle, Glenn B. Stracher, J.D. Stucker, Jordan W. Drew, Wayne D. Staggs, Tiffany M. Murray, Maxwell L. Hammond, Kenneth D. Adkins, Bailey J. Mullins, Edward W. Lemley
Global mineral resource assessment
Introduction
In response to the growing demand for information on the global mineral-resource base, the U.S. Geological Survey (USGS) is conducting the Quantitative Global Mineral Resource Assessment Project (GMRAP), a cooperative international project, begun in 2002, to assess the world's undiscovered nonfuel mineral resources.
Primary Objectives
The USGS conducts national and global assessments
Aquatic assessment of the Ely Copper Mine Superfund site, Vershire, Vermont
The Ely Mine, which operated from 1821 to 1905, and its area of downstream impact constitute the Ely Copper Mine Superfund site. The site was placed on the National Priorities List in 2001. The mine comprises underground workings, foundations from historical structures, several waste-rock piles, roast beds associated with the smelting operation, and slag piles resulting from the smelting. The mine
Authors
Robert R. Seal, Richard G. Kiah, Nadine M. Piatak, John M. Besser, James F. Coles, Jane M. Hammarstrom, Denise M. Argue, Denise M. Levitan, Jeffrey R. Deacon, Christopher G. Ingersoll
Total mercury, methylmercury, and selected elements in soils of the Fishing Brook watershed, Hamilton County, New York, and the McTier Creek watershed, Aiken County, South Carolina, 2008
Mercury is an element of on-going concern for human and aquatic health. Mercury sequestered in upland and wetland soils represents a source that may contribute to mercury contamination in sensitive ecosystems. An improved understanding of mercury cycling in stream ecosystems requires identification and quantification of mercury speciation and transport dynamics in upland and wetland soils within a
Authors
Laurel G. Woodruff, William F. Cannon, Christopher D. Knightes, Francis H. Chapelle, Paul M. Bradley, Douglas A. Burns, Mark E. Brigham, Mark A. Lowery
Deglaciation in the southeastern Laurentide Sector and the Hudson Valley – 15,000 Years of vegetational and climate history
In this field trip, we provide a review of the significant controversy concerning the timing of deglaciation in the Hudson and Wallkill Valleys. We outline the differences in methodology and chronology with a circular route throughout the Hudson and Wallkill valleys. We begin the trip at Lake Mohonk near New Paltz led by Kirsten Menking and Dorothy Peteet, then continue to the “black dirt” region
Authors
Dorothy M. Peteet, John Rayburn, Kirsten M. Menking, Guy Robinson, Byron D. Stone