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: 1912
Developing integrated methods to address complex resource and environmental issues Developing integrated methods to address complex resource and environmental issues
Introduction This circular provides an overview of selected activities that were conducted within the U.S. Geological Survey (USGS) Integrated Methods Development Project, an interdisciplinary project designed to develop new tools and conduct innovative research requiring integration of geologic, geophysical, geochemical, and remote-sensing expertise. The project was supported by the...
The link between volcanism and plutonism in epizonal magma systems; high-precision U–Pb zircon geochronology from the Organ Mountains caldera and batholith, New Mexico The link between volcanism and plutonism in epizonal magma systems; high-precision U–Pb zircon geochronology from the Organ Mountains caldera and batholith, New Mexico
The Organ Mountains caldera and batholith expose the volcanic and epizonal plutonic record of an Eocene caldera complex. The caldera and batholith are well exposed, and extensive previous mapping and geochemical analyses have suggested a clear link between the volcanic and plutonic sections, making this an ideal location to study magmatic processes associated with caldera volcanism. Here...
Authors
Matthew Rioux, Lang Farmer, Samuel Bowring, Kathleen M. Wooton, Jeffrey M. Amato, Drew S. Coleman, Philip L. Verplanck
The distribution and composition of REE-bearing minerals in placers of the Atlantic and Gulf coastal plains, USA The distribution and composition of REE-bearing minerals in placers of the Atlantic and Gulf coastal plains, USA
Rare earth element (REE) resources are currently of great interest because of their importance as raw materials for high-technology manufacturing. The REE-phosphates monazite (light REE enriched) and xenotime (heavy REE enriched) resist weathering and can accumulate in placer deposits as part of the heavy mineral assemblage. The Atlantic and Gulf coastal plains of the southeastern United...
Authors
Carleton R. Bern, Anjana K. Shah, William Benzel, Heather A. Lowers
Identification and dating of indigenous water storage reservoirs along the Rio San José at Laguna Pueblo, western New Mexico, USA Identification and dating of indigenous water storage reservoirs along the Rio San José at Laguna Pueblo, western New Mexico, USA
An investigation into indigenous water storage on the Rio San José in western New Mexico was conducted in support of efforts by the Pueblo of Laguna to adjudicate their water rights. Here we focus on stratigraphy and geochronology of two Native American-constructed reservoirs. One reservoir located near the community of Casa Blanca was formed by a ∼600 m (2000 feet) long stone masonry...
Authors
Gary Huckleberry, T.J. Ferguson, Tammy M. Rittenour, Chris Banet, Shannon A. Mahan
Evidence for nonuniform permafrost degradation after fire in boreal landscapes Evidence for nonuniform permafrost degradation after fire in boreal landscapes
Fire can be a significant driver of permafrost change in boreal landscapes, altering the availability of soil carbon and nutrients that have important implications for future climate and ecological succession. However, not all landscapes are equally susceptible to fire-induced change. As fire frequency is expected to increase in the high latitudes, methods to understand the vulnerability...
Authors
Burke J. Minsley, Neal J. Pastick, Bruce K. Wylie, Dana R.N. Brown, M. Andy Kass
Apatite fission-track evidence for regional exhumation in the subtropical Eocene, block faulting, and localized fluid flow in east-central Alaska Apatite fission-track evidence for regional exhumation in the subtropical Eocene, block faulting, and localized fluid flow in east-central Alaska
The origin and antiquity of the subdued topography of the Yukon–Tanana Upland (YTU), the physiographic province between the Denali and Tintina faults, are unresolved questions in the geologic history of interior Alaska and adjacent Yukon. We present apatite fission-track (AFT) results for 33 samples from the 2300 km2 western Fortymile district in the YTU in Alaska and propose an...
Authors
Cynthia Dusel-Bacon, Charles R. Bacon, Paul B. O'Sullivan, Warren C. Day
A salt diapir-related Mississippi Valley-type deposit: The Bou Jaber Pb-Zn-Ba-F deposit, Tunisia: Fluid inclusion and isotope study A salt diapir-related Mississippi Valley-type deposit: The Bou Jaber Pb-Zn-Ba-F deposit, Tunisia: Fluid inclusion and isotope study
The Bou Jaber Ba-F-Pb-Zn deposit is located at the edge of the Bou Jaber Triassic salt diapir in the Tunisia Salt Diapir Province. The ores are unconformity and fault-controlled and occur as subvertical column-shaped bodies developed in dissolution-collapse breccias and in cavities within the Late Aptian platform carbonate rocks, which are covered unconformably by impermeable shales and...
Authors
Salah Bouhlel, David Leach, Craig A. Johnson, Erin E. Marsh, Sihem Salmi-Laouar, David A. Banks
Introduction: Rare Earth and Critical Elements in Ore Deposits Introduction: Rare Earth and Critical Elements in Ore Deposits
No abstract available.
Authors
Philip L. Verplanck, Murray W. Hitzman
Exploration and geology of the Karangahake and Rahu epithermal Au-Ag deposits, Hauraki Goldfield Exploration and geology of the Karangahake and Rahu epithermal Au-Ag deposits, Hauraki Goldfield
Karangahake was the third largest gold producer in the Hauraki goldfield. In 2009, New Talisman Gold mines was granted a mining permit, and plans are underway to commence underground mine development of the Maria vein, which has a maiden Ore Reserve (consistent with the 2012 JORC Code) of 28 800 oz Au and 127 800 oz Ag. Exploration drilling at Rahu, located 2 km north of Karangahake has...
Authors
Mark P. Simpson, Murray R Stevens, Jeffrey L. Mauk, Matthew C Harris, Alistair G J Stuart
Ore mineralogy and textural zonation in the world-class epithermal Waihi Vein System, Hauraki Goldfield Ore mineralogy and textural zonation in the world-class epithermal Waihi Vein System, Hauraki Goldfield
The Waihi district in the Hauraki Goldfield of New Zealand contains adularia-sericite epithermal gold-silver veins that have produced more than 7.7 Moz gold. The outermost veins of the district (Martha, Favona, Moonlight, and Cowshed) contain abundant colloform, cherty, and black quartz fill textures, with minor crustiform and massive quartz. The central veins (Amaranth, Trio, and Union)...
Authors
Jeffrey L. Mauk, Erin G Skinner, Sarah J Fyfe, Andrew H Menzies, Heather A. Lowers, Alan E. Koenig
Implications of projected climate change for groundwater recharge in the western United States Implications of projected climate change for groundwater recharge in the western United States
Existing studies on the impacts of climate change on groundwater recharge are either global or basin/location-specific. The global studies lack the specificity to inform decision making, while the local studies do little to clarify potential changes over large regions (major river basins, states, or groups of states), a scale often important in the development of water policy. An...
Authors
Thomas Meixner, Andrew H. Manning, David A. Stonestrom, Diana M. Allen, Hoori Ajami, Kyle W. Blasch, Andrea E. Brookfield, Christopher L. Castro, Jordan F. Clark, David Gochis, Alan L. Flint, Kirstin L. Neff, Rewati Niraula, Matthew Rodell, Bridget R. Scanlon, Kamini Singha, Michelle Ann Walvoord
Toxicants in folk remedies: Implications of elevated blood lead in an American-born infant due to imported diaper powder Toxicants in folk remedies: Implications of elevated blood lead in an American-born infant due to imported diaper powder
Though most childhood lead exposure in the USA results from ingestion of lead-based paint dust, non-paint sources are increasingly implicated. We present interdisciplinary findings from and policy implications of a case of elevated blood lead (13–18 mcg/dL, reference level
Authors
Mateusz P. Karwowski, Suzette A. Morman, Geoffrey S. Plumlee, Terence Law, Mark Kellogg, Alan D. Woolf