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: 1986
Two-event genesis of Butte lode veins: Geologic and geochronologic evidence from ore veins, dikes, and host plutons Two-event genesis of Butte lode veins: Geologic and geochronologic evidence from ore veins, dikes, and host plutons
The long-standing ore-genesis model for world-class deposits of the Butte mining district, Montana, is of deep pre-Main Stage porphyry Cu-Mo and overlying Main Stage Ag-Zn-Cu-zoned lode veinsformed from discrete hydrothermal systems related to rhyolite dikes. The lode-specific model describes metals zones that formed in the lode veins as hydrothermal processes diminished in intensity...
Authors
Karen Lund, Ryan J. McAleer, John N. Aleinikoff, Michael Cosca
Model structural uncertainty quantification and hydrogeophysical data integration using airborne electromagnetic data Model structural uncertainty quantification and hydrogeophysical data integration using airborne electromagnetic data
Airborne electromagnetic (AEM) dataare usedto estimate large-scale model structural geometry, i.e. the spatial distribution of different lithological units based on assumed or estimated resistivity-lithology relationships, and the uncertainty in those structures given imperfect measurements. Geophysically derived estimates of model structural uncertainty are then combined with hydrologic
Authors
Burke J. Minsley, Nikolaj K Christensen, Steen Christensen, Yusen Ley-Cooper
Perspectives on the paleolimnology of the late Eocene Florissant lake from diatom and sedimentary evidence at Clare’s Quarry, Teller County, Colorado, USA Perspectives on the paleolimnology of the late Eocene Florissant lake from diatom and sedimentary evidence at Clare’s Quarry, Teller County, Colorado, USA
The late Eocene Florissant Formation in central Colorado is a rich and diverse continental Lagerstätte yielding well-preserved fossil assemblages from lacustrine and fluvial facies. This investigation focused on the lacustrine facies at Clare’s Quarry and used biotic and abiotic evidence to characterize aspects of the lake and processes that resulted in the accumulation and preservation...
Authors
Mary Ellen Benson, Dena M. Smith, Sarah A. Spaulding
Effect of organic matter concentration and characteristics on mercury mobilization and methylmercury production at an abandoned mine site Effect of organic matter concentration and characteristics on mercury mobilization and methylmercury production at an abandoned mine site
Thousands of abandoned mines throughout the western region of North America contain elevated total-mercury (THg) concentrations. Mercury is mobilized from these sites primarily due to erosion of particulate-bound Hg (THg-P). Organic matter-based soil amendments can promote vegetation growth on mine tailings, reducing erosion and subsequent loading of THg-P into downstream waterbodies...
Authors
Chris S. Eckley, Todd P. Luxton, Brooks Stanfield, Austin K. Baldwin, JoAnn M. Holloway, John McKernan, Mark S. Johnson
Direct observation of the depth of active groundwater circulation in an alpine watershed Direct observation of the depth of active groundwater circulation in an alpine watershed
The depth of active groundwater circulation is a fundamental control on stream flows and chemistry in mountain watersheds, yet it remains challenging to characterize and is rarely well constrained. We collected hydraulic conductivity, hydraulic head, temperature, chemical, noble gas, and 3H/3He groundwater age data from discrete levels in two boreholes 46 and 81 m deep in an alpine...
Authors
Andrew H. Manning, Lyndsay B. Ball, Richard B. Wanty, Kenneth H. Williams
Cretaceous to Oligocene magmatic and tectonic evolution of the western Alaska Range: Insights from U-Pb and 40Ar/39Ar geochronology Cretaceous to Oligocene magmatic and tectonic evolution of the western Alaska Range: Insights from U-Pb and 40Ar/39Ar geochronology
New U-Pb and 40Ar/39Ar ages integrated with geologic mapping and observations across the western Alaska Range constrain the distribution and tectonic setting of Cretaceous to Oligocene magmatism along an evolving accretionary plate margin in south-central Alaska. These rocks were emplaced across basement domains that include Neoproterozoic to Jurassic carbonate and siliciclastic strata...
Authors
James V. Jones, Erin Todd, Stephen E. Box, Peter J. Haeussler, Christopher S. Holm-Denoma, Susan M. Karl, Garth E. Graham, Dwight Bradley, Andrew R.C. Kylander-Clark, Richard M. Friedman, Paul W. Layer
Age and mantle sources of Quaternary basalts associated with “leaky” transform faults of the migrating Anatolia-Arabia-Africa triple junction Age and mantle sources of Quaternary basalts associated with “leaky” transform faults of the migrating Anatolia-Arabia-Africa triple junction
The Anatolia (Eurasia), Arabia, and Africa tectonic plates intersect in southeast Turkey, near the Gulf of İskenderun, forming a tectonically active and unstable triple junction (the A3 triple junction). The plate boundaries are marked by broad zones of major, dominantly left-lateral transform faults including the East Anatolian fault zone (the Anatolia-Arabia boundary) and the Dead...
Authors
Michael Cosca, Mary Reid, Jonathan Delph, Gonca Gencalioglu Kuscu, Janne Blichert-Toft, Wayne R. Premo, Donna L. Whitney, Christian Teyssier, Bora Rojay
Metallogenic implications of a new geodynamic model for the Eglab, Algeria Metallogenic implications of a new geodynamic model for the Eglab, Algeria
No abstract available.
Authors
Cliff D. Taylor, Dwight Bradley, Carol A. Finn, Arezki Zerrouki, Brahim Ayad, Nadjib F. Belanteur, Nabyl Bouchilaoune, Michaela Johnson, Ghania Meziane, Mark J. Mihalasky, Hamza Mouchene, Samir Oughou, Steven M. Smith, Federico Solano, Siham Zerrouk
Book review: Rare earth element resources: Indian context Book review: Rare earth element resources: Indian context
Rare Earth Element Resources: Indian Context. Yamuna Singh. 2020. ISBN 978-3-030-41353-8. Society of Earth Scientists Series, Springer, Cham, Switzerland, 269 Pp. Hardcover and eBook. €93.08 Rare Earth Element Resources: Indian Context by Yamuna Singh provides an excellent review of rare earth element (REE) deposits and occurrences in India with an emphasis on placer deposits, India’s...
Authors
Philip Verplanck
Baseflow age distributions and depth of active groundwater flow in a snow‐dominated mountain headwater basin Baseflow age distributions and depth of active groundwater flow in a snow‐dominated mountain headwater basin
Deeper flows through bedrock in mountain watersheds could be important, but lack of data to characterize bedrock properties limits understanding. To address data scarcity, we combine a previously published integrated hydrologic model of a snow‐dominated, headwater basin of the Colorado River with a new method for dating baseflow age using dissolved gas tracers SF6, CFC‐113, N2, and Ar...
Authors
Rosemary W.H. Carroll, Andrew H. Manning, Richard G. Niswonger, David W Marchetti, Kenneth H. Williams
Alkalic-type epithermal gold deposit model Alkalic-type epithermal gold deposit model
This report summarizes the primary characteristics of alkalic-type epithermal gold (Au) deposits and provides an updated descriptive model. These deposits, primarily of Mesozoic to Neogene age, are among the largest epithermal gold deposits in the world. Considered a subset of low-sulfidation epithermal deposits, they are spatially and genetically linked to small stocks or clusters of...
Authors
Karen D. Kelley, Paul G. Spry, Virginia T. McLemore, David L. Fey, Eric D. Anderson
Hydrogeochemistry in the Yukon-Tanana Upland region of east-central Alaska: Possible exploration tool for porphyry-style deposits Hydrogeochemistry in the Yukon-Tanana Upland region of east-central Alaska: Possible exploration tool for porphyry-style deposits
A hydrogeochemical study using high resolution ICP-MS was undertaken at the Taurus and other porphyry Cu-Mo(-Au) occurrences and Ag-Au-Cu (+/- Pb, Zn) occurrences with epithermal-style characteristics in the Yukon-Tanana upland region of eastern Alaska. Surface water samples were collected from 30 sites on creeks that drain known deposits and occurrences and surrounding presumably...
Authors
Karen D. Kelley, Garth E. Graham