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: 1826
Critical minerals in Climax-type magmatic-hydrothermal systems
Today’s global economy is challenged to meet the growing demand for commodities used in existing and emerging advanced technologies. Critical minerals are commodities found in a wide variety of ore deposits that are vital to the economic or national security of individual nations that are vulnerable to supply disruption. The U.S. Geological Survey is striving to advance understanding of critical m
Authors
Celestine N. Mercer, Mario A Guzman, Albert H. Hofstra, Joshua Mark Rosera
Stable isotope constraints on the source of ore fluids for the Hicks Dome REE+Y-HFSE-fluorspar deposit
Hicks Dome is comprised of coarse crystalline Mississippi Valley Type deposits at shallow levels and an enigmatic, fine-grained fluorite, rare earth elements, Y, high field strength elements, Be, and Ba rich deposit at deeper levels. Phyllosilicates from a lamprophyre dike and a breccia from two Hicks Dome drill cores were sampled to resolve the fluid history of the entire deposit using light stab
Authors
Julia A. McIntosh, Craig A. Johnson, Allen K. Andersen, Albert H. Hofstra
Can the mining industry meet global demand for critical minerals?
No abstract available.
Authors
Jeffrey L. Mauk, Jonathan Andrew Funk, Nick Karl
Local topography and streambed hydraulic conductivity influence riparian groundwater age and groundwater-surface water connection
The western U.S. is experiencing increasing rain to snow ratios due to climate change, and scientists are uncertain how changing recharge patterns will affect future groundwater-surface water connection. We examined how watershed topography and streambed hydraulic conductivity impact groundwater age and stream discharge at eight sites along a headwater stream within the Manitou Experimental Forest
Authors
Sara R. Warix, Alexis Navarre-Sitchler, Andrew H. Manning, Kamini Singha
Roles of regional structures and country-rock facies in defining mineral belts in central Idaho mineral province with detail for Yellow Pine and Thunder Mountain mining districts
The central Idaho metallogenic province hosts numerous mineral deposit types. These include Late Cretaceous precious-polymetallic vein deposits, amagmatic Paleocene–Eocene breccia-hosted gold-tungsten-antimony deposits, and Eocene mercury deposits in metasedimentary roof pendants and in Late Cretaceous granitoids. Hot-springs gold deposits in Eocene volcanic rocks are also included in the central
Authors
Karen Lund, John N. Aleinikoff, Christopher Holm-Denoma
Kesem-Kebena-Dulecha study area, Ethiopia
In 1988 and 1989, the Paleoanthropological Inventory of Ethiopia (PIE) field expedition discovered numerous localities of prehistoric significance across Ethiopia (WoldeGabriel et al., 1992). One of the regions surveyed by the Inventory team was the Dulecha administrative district (Gabi Rasu), Afar Zone (Fig. 1). The surveyed area (geographic reference: 9.407° N, 40.057° E) includes the watershed
Authors
W. Henry Gilbert, V.B. Doronichev, L.V. Golovanova, Leah E. Morgan, Luis Nunez, Laura Rodriguez, Nohemi Sala, D. Cusimano, I. de Gaspar, Paul Mazza, N. Garcia
Potassium-39-derived 36Ar production during fission-neutron irradiation and its effect on 40Ar/39Ar ages
Various interference reactions producing unwanted Ar isotopes from K, Ca, Cl and Ar require correction to satisfy the 40Ar/39Ar age equation. Using GEANT4, we design and build a model Cadmium Lined In Core Irradiation Tube (CLICIT) irradiation facility, as used in the Oregon State TRIGA Reactor (OSTR). We illustrate the complexity of the irradiation of geologic samples within this framework and de
Authors
Jack N. Carter, Paul R. Renne, Leah E. Morgan
First observation of the ground-state electron-capture of 40K
Potassium-40 is a widespread, naturally occurring isotope whose radioactivity impacts estimated geological ages spanning billions of years, nuclear structure theory, and subatomic rare-event searches—including those for dark matter and neutrinoless double-beta decay. The decays of this long-lived isotope must be precisely known for its use as a geochronometer, and to account for its presence in lo
Authors
L. Hariasz, M. Stukel, P.C.F. Di Stefano, B.C. Rasco, K.P. Rykaczewski, N.T. Brewer, D.W. Stracener, Y. Liu, Z. Gai, C. Rouleau, J. B. Carter, J. Kostensalo, J. Suhonen, H. Davis, E.D. Lukosi, K.C. Goetz, R.K. Grzywacz, M. Mancuso, F. Petricca, A. Fijalkowska, M. Wolinska-Cichocka, J. Ninkovic, P. Lechner, R.B. Ickert, Leah E. Morgan, P.R. Renne, I. Yavin
Rare 40K decay with implications for fundamental physics and geochronology
Potassium-40 is a widespread, naturally occurring isotope whose radioactivity impacts subatomic rare-event searches, nuclear structure theory, and estimated geological ages. A predicted electron-capture decay directly to the ground state of argon-40 has never been observed. The KDK (potassium decay) collaboration reports strong evidence of this rare decay mode. A blinded analysis reveals a nonzero
Authors
M. Stukel, L. Hariasz, P.C.F. Di Stefano, B.C. Rasco, K.P. Rykaczewski, N.T. Brewer, D.W. Stracener, Y. Liu, Z. Gai, C. Rouleau, J. B. Carter, J. Kostensalo, J. Suhonen, H. Davis, E.D. Lukosi, K.C. Goetz, R.K. Grzywacz, M. Mancuso, F. Petricca, A. Fijalkowska, M. Wolinska-Cichocka, J. Ninkovic, P. Lechner, R.B. Ickert, Leah E. Morgan, P.R. Renne, I. Yavin
Hyperspectral cathodoluminescence and quantitative EPMA mapping of angrite northwest Africa 15507
Angrite meteorites represent alkali depleted planetary crust of basaltic composition, and have both plutonic and volcanic lithologies. NWA 15507 is a microgabbroic specimen (mean grainsize ~1.4 mm) composed predominantly of zoned Al-Ti-augite, Ca-bearing olivine and anorthite together with accessory kirschsteinite, rhönite, hercynite, low-Ni kamacite, merrillite, magnetite and troilite. Upon ini
Authors
Heather A. Lowers, Jay Michael Thompson, Paul K. Carpenter, Zoe Wilbur, Anthony Irving
Compressional-wave seismic velocity, bulk density, and their empirical relations for geophysical modeling of the Midcontinent Rift System in the Lake Superior region
Compressional-wave seismic velocity (velocity) and bulk density (density) data were compiled from published sources for rock suites and earth materials that are significant for geophysical modeling of the Mesoproterozoic Midcontinent Rift System in the Lake Superior region. The data include laboratory measurements of outcrop and drill core samples, seismic refraction studies, and a sonic log from
Authors
V. J. S. Grauch
Automated georeferencing and feature extraction of geologic maps and mineral sites
The predictive power of mineral prospectivity analysis depends on high quality, spatially accurate, analysis-ready datasets. Of paramount importance are geologic maps and mineral site data, but the state of readiness for utilizing these datasets remains sub-optimal for advanced computational techniques. As the U.S. Geological Survey (USGS) fulfils its mission to map the distribution of critical mi
Authors
Graham W. Lederer, Joshua Mark Rosera, Margaret A. Goldman, Garth E. Graham, Asitang Mishra, Amanda Towler, Brian Wilson, Dustin Graf, Michael Milano, Elizabeth Roberts, Gabrielle Hedrick, Carsten Oertel, Anastassios Dardas, Thomas McEntee