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
40Ar∗ loss in experimentally deformed muscovite and biotite with implications for 40Ar/39Ar geochronology of naturally deformed rocks 40Ar∗ loss in experimentally deformed muscovite and biotite with implications for 40Ar/39Ar geochronology of naturally deformed rocks
The effects of deformation on radiogenic argon (40Ar∗) retentivity in mica are described from high pressure experiments performed on rock samples of peraluminous granite containing euhedral muscovite and biotite. Cylindrical cores, ∼15 mm in length and 6.25 mm in diameter, were drilled from granite collected from the South Armorican Massif in northwestern France, loaded into gold...
Authors
Michael Cosca, Holger Stunitz, Anne-Lise Bourgiex, John P. Lee
Reply to the comment on the paper "Is the track of the Yellowstone hotspot driven by a deep mantle plume?-Review of volcanism, faulting, and uplift in light of new data" Reply to the comment on the paper "Is the track of the Yellowstone hotspot driven by a deep mantle plume?-Review of volcanism, faulting, and uplift in light of new data"
No abstract available.
Authors
Kenneth L. Pierce, Lisa A. Morgan
Rapid cooling rates at an active mid-ocean ridge from zircon thermochronology Rapid cooling rates at an active mid-ocean ridge from zircon thermochronology
Oceanic spreading ridges are Earth's most productive crust generating environment, but mechanisms and rates of crustal accretion and heat loss are debated. Existing observations on cooling rates are ambiguous regarding the prevalence of conductive vs. convective cooling of lower oceanic crust. Here, we report the discovery and dating of zircon in mid-ocean ridge dacite lavas that...
Authors
Axel K. Schmitt, Michael R. Perfit, Kenneth H. Rubin, Daniel F. Stockli, Matthew C. Smith, Laurie A. Cotsonika, Georg F. Zellmer, W. Ian Ridley
Deposit model for closed-basin potash-bearing brines Deposit model for closed-basin potash-bearing brines
Closed-basin potash-bearing brines are one of the types of potash deposits that are a source of potash production within the United States, as well as other countries. Though these deposits are of highly variable size, they are important sources of potash on a regional basis. In addition, these deposits have a high potential of co- and by-product production of one or more commodities...
Authors
Greta J. Orris
Simultaneous speciation of arsenic, selenium, and chromium: species, stability, sample preservation, and analysis of ash and soil leachates Simultaneous speciation of arsenic, selenium, and chromium: species, stability, sample preservation, and analysis of ash and soil leachates
An analytical method using high-performance liquid chromatography separation with inductively coupled plasma mass spectrometry (ICP-MS) detection previously developed for the determination of Cr(III) and Cr(VI) has been adapted to allow the determination of As(III), As(V), Se(IV), Se(VI), Cr(III), and Cr(VI) under the same chromatographic conditions. Using this method, all six inorganic...
Authors
Ruth E. Wolf, Suzette A. Morman, Philip L. Hageman, Todd M. Hoefen, Geoffrey S. Plumlee
The Moon Mineralogy Mapper (M3) imaging spectrometer for lunar science: Instrument description, calibration, on‐orbit measurements, science data calibration and on‐orbit validation The Moon Mineralogy Mapper (M3) imaging spectrometer for lunar science: Instrument description, calibration, on‐orbit measurements, science data calibration and on‐orbit validation
The NASA Discovery Moon Mineralogy Mapper imaging spectrometer was selected to pursue a wide range of science objectives requiring measurement of composition at fine spatial scales over the full lunar surface. To pursue these objectives, a broad spectral range imaging spectrometer with high uniformity and high signal-to-noise ratio capable of measuring compositionally diagnostic spectral
Authors
C. Pieters, P. Mouroulis, M. Eastwood, J. Boardman, R.O. Green, T. Glavich, P. Isaacson, A. Chatterjee, R. Clark, D. Barr, M. Annadurai, S. Besse, D. Cate, L. Cheek, J. Combe, D. Dhingra, V. Essandoh, S. Geier, J.N. Goswami, R. Green, V. Haemmerle, J. Head, L. Hovland, S. Hyman, R. Klima, T. Koch, G. Kramer, A.S.K. Kumar, K. Lee, S. Lundeen, E. Malaret, T. McCord, S. McLaughlin, J. Mustard, J. Nettles, N. Petro, K. Plourde, C. Racho, J. Rodriguez, C. Runyon, G. Sellar, C. Smith, H. Sobel, M. Staid, J. Sunshine, L. Taylor, K. Thaisen, S. Tompkins, H. Tseng, G. Vane, P. Varanasi, M. White, D. Wilson
Audiomagnetotelluric data, Taos Plateau Volcanic Field, New Mexico Audiomagnetotelluric data, Taos Plateau Volcanic Field, New Mexico
The U.S. Geological Survey is conducting a series of multidisciplinary studies of the San Luis Basin as part of the Geologic framework of the Rio Grande Basins project. Detailed geologic mapping, high-resolution airborne magnetic surveys, gravity surveys, audiomagnetotelluric surveys, and hydrologic and lithologic data are being used to better understand the aquifers. This report...
Authors
Chad E. Ailes, Brian D. Rodriguez
PRISM: Processing routines in IDL for spectroscopic measurements (installation manual and user's guide, version 1.0) PRISM: Processing routines in IDL for spectroscopic measurements (installation manual and user's guide, version 1.0)
This report describes procedures for installing and using the U.S. Geological Survey Processing Routines in IDL for Spectroscopic Measurements (PRISM) software. PRISM provides a framework to conduct spectroscopic analysis of measurements made using laboratory, field, airborne, and space-based spectrometers. Using PRISM functions, the user can compare the spectra of materials of unknown...
Authors
Raymond F. Kokaly
Alaska Geochemical Database (AGDB)-Geochemical data for rock, sediment, soil, mineral, and concentrate sample media Alaska Geochemical Database (AGDB)-Geochemical data for rock, sediment, soil, mineral, and concentrate sample media
The Alaska Geochemical Database (AGDB) was created and designed to compile and integrate geochemical data from Alaska in order to facilitate geologic mapping, petrologic studies, mineral resource assessments, definition of geochemical baseline values and statistics, environmental impact assessments, and studies in medical geology. This Microsoft Access database serves as a data archive...
Authors
Matthew Granitto, Elizabeth A. Bailey, Jeanine M. Schmidt, Nora B. Shew, Bruce M. Gamble, Keith A. Labay
Using dissolved gases to observe the evolution of groundwater age in a mountain watershed over a period of thirteen years Using dissolved gases to observe the evolution of groundwater age in a mountain watershed over a period of thirteen years
Baseflows in snowmelt-dominated mountain streams are critical for sustaining ecosystems and water resources during periods of greatest demand. Future climate predictions for mountainous areas throughout much of the western U.S. include increasing temperatures, declining snowpacks, and earlier snowmelt periods. The degree to and rate at which these changes will affect baseflows in...
Authors
Andrew H. Manning
Digitized data from ground geophysical surveys in Afghanistan: A website for distribution of data Digitized data from ground geophysical surveys in Afghanistan: A website for distribution of data
This document describes the process of digitization of a 1974 report on geophysical work undertaken by Soviet geophysicists in southern and eastern Afghanistan. These data, uncovered in Afghanistan, represent magnetic and electrical ground surveys for which locations are not well defined. Due to lack of location information, these surveys were georeferenced using the cities, rivers, and
Authors
Sarah W. Polster, Benjamin J. Drenth
Petrologic, tectonic, and metallogenic evolution of the Ancestral Cascades magmatic arc, Washington, Oregon, and northern California Petrologic, tectonic, and metallogenic evolution of the Ancestral Cascades magmatic arc, Washington, Oregon, and northern California
Present-day High Cascades arc magmatism was preceded by ∼40 m.y. of nearly cospatial magmatism represented by the ancestral Cascades arc in Washington, Oregon, and northernmost California (United States). Time-space-composition relations for the ancestral Cascades arc have been synthesized from a recent compilation of more than 4000 geochemical analyses and associated age data. Neither...
Authors
Edward A. du Bray, David A. John