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: 1954
Incorporating uncertainty into groundwater salinity mapping using AEM data Incorporating uncertainty into groundwater salinity mapping using AEM data
Airborne electromagnetic surveys provide spatially extensive resistivity information that can be useful for groundwater salinity mapping; however, the transformation from geophysical data to salinity interpretations carries uncertainty. We compare two quantitative approaches to salinity mapping recently applied to address water resource management objectives: the location of the depth to...
Authors
Lyndsay B. Ball, Burke J. Minsley
Ten years on from the quake that shook the nation’s capital Ten years on from the quake that shook the nation’s capital
No abstract available.
Authors
Thomas L. Pratt, Martin C. Chapman, Anjana K. Shah, J. Wright Horton,, Oliver S. Boyd
Reconnaissance study of the major and trace element content of bauxite deposits in the Arkansas bauxite region, Saline and Pulaski Counties, central Arkansas Reconnaissance study of the major and trace element content of bauxite deposits in the Arkansas bauxite region, Saline and Pulaski Counties, central Arkansas
The Arkansas bauxite district, which comprises about 275 square miles (710 square kilometers) of central Arkansas, produced an order of magnitude more bauxite and alumina than the other bauxite districts in the United States combined. Bauxite was mined in the region continuously from 1898 to 1982. These bauxites are laterite deposits, formed from intensive in-place weathering of the...
Authors
Bradley S. Van Gosen, LaDonna M. Choate
Geometry of the décollement below eastern Bangladesh and implications for seismic hazard Geometry of the décollement below eastern Bangladesh and implications for seismic hazard
Eastern Bangladesh sits on the seismically active Chittagong-Myanmar fold and thrust belt (CMFB), a north-trending accretionary wedge on the eastern side of the India-Eurasia collision. Earthquakes on the basal décollement and associated thrusts within the CMFB present a hazard to this densely populated region. In this study, we interpret 28 seismic reflection profiles from both...
Authors
Paula Burgi, Juddith Hubbard, Syed Humayun Akhter, Dana E. Peterson
Approach for quantifying rare Earth elements at low keV Approach for quantifying rare Earth elements at low keV
The challenges of analyzing bastnaesite (REECO3F) and hydroxylbastnaesite (REECO3OH) include beam sensitivity, quantification of light elements in a heavy element matrix, the presence of elements that cannot be analyzed with EPMA (H), and the use of x-ray lines whose physical constants are not well known. To overcome some of these challenges, Ca, La, Ce, Pr, Nd, and Sm were analyzed at...
Authors
Heather A. Lowers
Detrital zircon record of magmatism and sediment dispersal across the North American Cordilleran arc system (28-48°N) Detrital zircon record of magmatism and sediment dispersal across the North American Cordilleran arc system (28-48°N)
As zircon U-Pb geochronology has become a leading method in sediment provenance studies and basin analysis over the past 20 years, the volume of detrital zircon data made available in published literature has enabled researchers to go beyond source-to-sink provenance studies to explore increasingly complex geologic problems. In this review, we utilize the growing body of detrital zircon...
Authors
Theresa Maude Schwartz, Kathleen D. Surpless, Joseph P. Colgan, Samuel Johnstone, Christopher S. Holm-Denoma
Geophysical insights into Paleoproterozoic tectonics along the southern margin of the Superior Province, central Upper Peninsula, Michigan Geophysical insights into Paleoproterozoic tectonics along the southern margin of the Superior Province, central Upper Peninsula, Michigan
No abstract available.
Authors
Benjamin J. Drenth, William F. Cannon, Klaus Schulz, Robert A. Ayuso
Mineral Mapping of the Battle Mountain District, Nevada, USA, Using AVIRIS-Classic and SpecTIR Inc. AisaFENIX 1K Imaging Spectrometer Datasets Mineral Mapping of the Battle Mountain District, Nevada, USA, Using AVIRIS-Classic and SpecTIR Inc. AisaFENIX 1K Imaging Spectrometer Datasets
Imaging spectroscopy (hyperspectral imaging) has been used to successfully map minerals at the outcrop, deposit, district, and regional scale. This contribution presents spectral-based mineral maps of the Battle Mountain mining district, Nevada, USA, generated using multi-scale airborne imaging and ground-based point spectrometers. Airborne Visible/Infrared Imaging Spectrometer (AVIRIS)...
Authors
John Michael Meyer, Elizabeth A. Holley, Raymond F. Kokaly, Gregg A. Swayze, Todd M. Hoefen
GIS-based identification of areas that have resource potential for lode gold in Alaska GIS-based identification of areas that have resource potential for lode gold in Alaska
Several comprehensive, data-driven geographic information system (GIS) analyses were conducted to assess prospectivity for lode gold in Alaska. These analyses use available geospatial datasets of lithologic, geochemical, mineral occurrence, and geophysical data to build models for recognizing different types of gold deposits within physiographic units defined by stream drainage basins...
Authors
Susan M. Karl, Douglas C. Kreiner, George N.D. Case, Keith A. Labay, Nora B. Shew, Matthew Granitto, Bronwen Wang, Eric D. Anderson
Chemical analysis of archived stream-sediment samples, Alaska Chemical analysis of archived stream-sediment samples, Alaska
Geochemical data are presented for more than 1,500 archived stream-sediment samples and accompanying quality control samples. The archived sediments were reanalyzed to improve the stream geochemical dataset for Alaska and to support ongoing U.S. Geological Survey (USGS) studies. Sediment samples were primarily from the USGS Mineral Resources Program’s sample archive in Denver, Colorado...
Authors
Bronwen Wang, George N.D. Case, Mathew Granitto, Keith A. Labay, Nora B. Shew, Andrew D. Ingraham, Jaime S. Azain, Zachary C. Bueghly, Susan M. Karl, Karen D. Kelley
Airborne geophysical surveys of the lower Mississippi Valley demonstrate system-scale mapping of subsurface architecture Airborne geophysical surveys of the lower Mississippi Valley demonstrate system-scale mapping of subsurface architecture
The Mississippi Alluvial Plain hosts one of the most prolific shallow aquifer systems in the United States but is experiencing chronic groundwater decline. The Reelfoot rift and New Madrid seismic zone underlie the region and represent an important and poorly understood seismic hazard. Despite its societal and economic importance, the shallow subsurface architecture has not been mapped...
Authors
Burke J. Minsley, James R. Rigby, Stephanie R. James, Bethany L. Burton, Katherine J. Knierim, Michael Pace, Paul A. Bedrosian, Wade Kress
Age and tectonic setting of the Quinebaug-Marlboro belt and implications for the history of Ganderian crustal fragments in southeastern New England, USA Age and tectonic setting of the Quinebaug-Marlboro belt and implications for the history of Ganderian crustal fragments in southeastern New England, USA
Crustal fragments underlain by high-grade rocks represent a challenge to plate reconstructions, and integrated mapping, geochronology, and geochemistry enable the unravelling of the temporal and spatial history of exotic crustal blocks. The Quinebaug-Marlboro belt (QMB) is an enigmatic fragment on the trailing edge of the peri-Gondwanan Ganderian margin of southeastern New England...
Authors
Gregory J. Walsh, John N. Aleinikoff, Robert A. Ayuso, Robert P. Wintsch