Publications
Products (journal articles, reports, fact sheets) authored by current and past scientists are listed below. Please check the USGS Pubs Warehouse for other USGS publications.
Filter Total Items: 1913
The tectono-stratigraphic framework and evolution of southwestern Maine and southeastern New Hampshire The tectono-stratigraphic framework and evolution of southwestern Maine and southeastern New Hampshire
Five belts of metamorphosed sedimentary and volcanic rocks underlie southwestern Maine and southeastern New Hampshire: Middle Ordovician Falmouth-Brunswick sequence; Middle and Late Ordovician Casco Bay Group, and Late Ordovician to Early Silurian rocks of the Merribuckfred Basin; Late Ordovician to Early Silurian rocks of the East Harpswell Group; Silurian to Early Devonian rocks of the...
Authors
Arthur M. Hussey, Wallace A. Bothner, John N. Alienikoff
J is for jack J is for jack
The early days of drilling created a test of strength and endurance for miners.
Authors
W. H. Langer
Are modern geothermal waters in northwest Nevada forming epithermal gold deposits? Are modern geothermal waters in northwest Nevada forming epithermal gold deposits?
Hydrothermal systems currently are active near some gold deposits in northwestern Nevada. Possible links of these modern systems to gold mineralization were evaluated by chemically and isotopically analyzing water samples from the Brady, Dixie Valley, Humboldt House, San Emidio-Empire, Soda Lake, and Wabuska geothermal areas. In addition, quartz veins from Humboldt House and the adjacent...
Authors
George N. Breit, Andrew G. Hunt, Ruth E. Wolf, Alan E. Koenig, Richard Fifarek, Mark F. Coolbaugh
Tectonic, magmatic, and metamorphic history of the New Jersey Highlands: New insights from SHRIMP U-Pb geochronology Tectonic, magmatic, and metamorphic history of the New Jersey Highlands: New insights from SHRIMP U-Pb geochronology
No abstract available.
Authors
Richard A. Volkert, John N. Aleinikoff, C. Mark Fanning
Estimating natural background groundwater chemistry, Questa molybdenum mine, New Mexico Estimating natural background groundwater chemistry, Questa molybdenum mine, New Mexico
This 2 1/2 day field trip will present an overview of a U.S. Geological Survey (USGS) project whose objective was to estimate pre-mining groundwater chemistry at the Questa molybdenum mine, New Mexico. Because of intense debate among stakeholders regarding pre-mining groundwater chemistry standards, the New Mexico Environment Department and Chevron Mining Inc. (formerly Molycorp) agreed...
Authors
Phillip L. Verplanck, D. Kirk Nordstrom, Geoffrey S. Plumlee, Bruce M. Walker
Silica in a Mars analog environment: Ka u Desert, Kilauea Volcano, Hawaii Silica in a Mars analog environment: Ka u Desert, Kilauea Volcano, Hawaii
Airborne Visible/Near-Infrared Imaging Spectrometer (AVIRIS) data acquired over the Ka u Desert are atmospherically corrected to ground reflectance and used to identify the mineralogic components of relatively young basaltic materials, including 250-700 and 200-400 year old lava flows, 1971 and 1974 flows, ash deposits, and solfatara incrustations. To provide context, a geologic surface...
Authors
K.D. Seelos, R. E. Arvidson, B.L. Jolliff, S.M. Chemtob, R.V. Morris, D. W. Ming, G.A. Swayze
B is for blinding B is for blinding
An enterprising operator finds a solution to a geologic problem that had been in the making for 1.4 million years.
Authors
W. H. Langer
In vitro studies evaluating leaching of mercury from mine waste calcine using simulated human body fluids In vitro studies evaluating leaching of mercury from mine waste calcine using simulated human body fluids
In vitro bioaccessibility (IVBA) studies were carried out on samples of mercury (Hg) mine-waste calcine (roasted Hg ore) by leaching with simulated human body fluids. The objective was to estimate potential human exposure to Hg due to inhalation of airborne calcine particulates and hand-to-mouth ingestion of Hg-bearing calcines. Mine waste calcines collected from Hg mines at Almadén...
Authors
John E. Gray, Geoffrey S. Plumlee, Suzette A. Morman, Pablo L. Higueras, James G. Crock, Heather A. Lowers, Mark L. Witten
Mineralogical and chemical characteristics of some natural jarosites 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...
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
D is for diamond D is for diamond
Real diamonds are a girl's best friend, but synthetic ones opened up a whole new world for granite.
Authors
W. H. Langer
Thermochronology and tectonics of the Leeward Antilles: Evolution of the southern Caribbean Plate boundary zone Thermochronology and tectonics of the Leeward Antilles: Evolution of the southern Caribbean Plate boundary zone
Tectonic reconstructions of the Caribbean Plate are severely hampered by a paucity of geochronologic and exhumation constraints from anastomosed basement blocks along its southern margin. New U/Pb, 40Ar/39Ar, apatite fission track, and apatite (U-Th)/He data constrain quantitative thermal and exhumation histories, which have been used to propose a model for the tectonic evolution of the...
Authors
Roelant van der Lelij, Richard A. Spikings, Andrew C. Kerr, Alexandre Kounov, Michael Cosca, David Chew, Diego Villagomez