William Ridley

Science and Products

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  August 3, 2020

  Non-Traditional Stable Isotopes

  Understanding the genesis of ore deposits and their behavior in the environment is a subject of great importance to the Nation. A relatively new tool to aid in these efforts to investigate the origin and environmental effects of ore deposits is the use of "heavy" metal stable isotopes. Our research objectives are to utilize various isotopic systems to advance our understanding of ore genesis and...

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

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  August 3, 2020

  Non-Traditional Stable Isotopes

  Understanding the genesis of ore deposits and their behavior in the environment is a subject of great importance to the Nation. A relatively new tool to aid in these efforts to investigate the origin and environmental effects of ore deposits is the use of "heavy" metal stable isotopes. Our research objectives are to utilize various isotopic systems to advance our understanding of ore genesis and...

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  September 30, 2016

  ASTRA: ASTeroid Resource Assessment

  The study was conducted to determine if the USGS process for conducting mineral resource assessments on Earth can be applied to asteroids

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

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  September 30, 2016

  ASTRA: ASTeroid Resource Assessment

  The study was conducted to determine if the USGS process for conducting mineral resource assessments on Earth can be applied to asteroids

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• Publications
  Filter Total Items: 38

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  April 21, 2017

  Feasibility study for the quantitative assessment of mineral resources in asteroids

  This study was undertaken to determine if the U.S. Geological Survey’s process for conducting mineral resource assessments on Earth can be applied to asteroids. Successful completion of the assessment, using water and iron resources to test the workflow, has resulted in identification of the minimal adjustments required to conduct full resource assessments beyond Earth. We also identify the types

  Authors

  Laszlo P. Keszthelyi, Justin Hagerty, Amanda Bowers, Karl J. Ellefsen, Ian Ridley, Trude King, David Trilling, Nicholas Moskovitz, Will Grundy

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  Natural Hazards Mission Area, Astrogeology Science Center

  September 25, 2015

  Measurement of in situ sulfur isotopes by laser ablation multi-collector ICPMS: opening Pandora’s Box

  Laser ablation multi-collector ICPMS is a modern tool for in situ measurement of S isotopes. Advantages of the technique are speed of analysis and relatively minor matrix effects combined with spatial resolution sufficient for many applications. The main disadvantage is a more destructive sampling mechanism relative to the ion microprobe technique. Recent advances in instrumentation allow precise

  Authors

  William I. Ridley, Michael Pribil, Alan E. Koenig, John F. Slack

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  Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center

  September 21, 2015

  Sulfate and sulfide sulfur isotopes (δ34S and δ33S) measured by solution and laser ablation MC-ICP-MS: An enhanced approach using external correction

  Isotope ratio measurements using a multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) commonly use standard-sample bracketing with a single isotope standard for mass bias correction for elements with narrow-range isotope systems measured by MC-ICP-MS, e.g. Cu, Fe, Zn, and Hg. However, sulfur (S) isotopic composition (δ34S) in nature can range from at least − 40 to + 40‰, pote

  Authors

  Michael Pribil, William I. Ridley, Poul Emsbo

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  Geology, Geophysics, and Geochemistry Science Center

  March 9, 2012

  Volcanogenic massive sulfide occurrence model: Chapter C in Mineral deposit models for resource assessment

  Volcanogenic massive sulfide deposits, also known as volcanic-hosted massive sulfide, volcanic-associated massive sulfide, or seafloor massive sulfide deposits, are important sources of copper, zinc, lead, gold, and silver (Cu, Zn, Pb, Au, and Ag). These deposits form at or near the seafloor where circulating hydrothermal fluids driven by magmatic heat are quenched through mixing with bottom water

  Authors

  W.C. Pat Shanks, Randolph A. Koski, Dan L. Mosier, Klaus J. Schulz, Lisa A. Morgan, John F. Slack, W. Ian Ridley, Cynthia Dusel-Bacon, Robert R. Seal, Nadine M. Piatak

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  Energy and Minerals Mission Area, Ecosystems Mission Area, Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Northern Rocky Mountain Science Center

  November 28, 2011

  Mineralogy and composition of the oceanic mantle

  The mineralogy of the oceanic basalt source region is examined by testing whether a peridotite mineralogy can yield observed whole-rock and olivine compositions from (1) the Hawaiian Islands, our type example of a mantle plume, and (2) the Siqueiros Transform, which provides primitive samples of normal mid-ocean ridge basalt. New olivine compositional data from phase 2 of the Hawaii Scientific Dri

  Authors

  Keith Putirka, F. J. Ryerson, Michael Perfit, W. Ian Ridley

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

  November 9, 2011

  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 constrain magmati

  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

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

  January 1, 2011

  Trace and minor element variations and sulfur isotopes in crystalline and colloform ZnS: Incorporation mechanisms and implications for their genesis

  Various models have been proposed to explain the formation mechanism of colloform sphalerite, but the origin is still under debate. In order to decipher influences on trace element incorporation and sulfur isotope composition, crystalline and colloform sphalerite from the carbonate-hosted Mississippi-Valley Type (MVT) deposit near Wiesloch, SW Germany, were investigated and compared to sphalerite

  Authors

  Katharina Pfaff, Alan Koenig, Thomas Wenzel, Ian Ridley, Ludwig H. Hildebrandt, David L. Leach, Gregor Markl

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  Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

  January 1, 2011

  Volatile abundances and oxygen isotopes in basaltic to dacitic lavas on mid-ocean ridges: The role of assimilation at spreading centers

  Most geochemical variability in MOR basalts is consistent with low- to moderate-pressure fractional crystallization of various mantle-derived parental melts. However, our geochemical data from MOR high-silica glasses, including new volatile and oxygen isotope data, suggest that assimilation of altered crustal material plays a significant role in the petrogenesis of dacites and may be important in

  Authors

  V.D. Wanless, M.R. Perfit, W.I. Ridley, P.J. Wallace, Craig B. Grimes, E.M. Klein

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  Geosciences and Environmental Change Science Center

  January 1, 2010

  Trace elements have limited utility for studying migratory connectivity in shorebirds that winter in Argentina

  Trace-element analysis has been suggested as a tool for the study of migratory connectivity because (1) trace-element abundance varies spatially in the environment, (2) trace elements are assimilated into animals' tissues through the diet, and (3) current technology permits the analysis of multiple trace elements in a small tissue sample, allowing the simultaneous exploration of several elements.

  Authors

  J. Torres-Dowdall, A.H. Farmer, M. Abril, E.H. Bucher, I. Ridley

  January 1, 2010

  Dacite petrogenesis on mid-ocean ridges: Evidence for oceanic crustal melting and assimilation

  Whereas the majority of eruptions at oceanic spreading centers produce lavas with relatively homogeneous mid-ocean ridge basalt (MORB) compositions, the formation of tholeiitic andesites and dacites at mid-ocean ridges (MORs) is a petrological enigma. Eruptions of MOR high-silica lavas are typically associated with ridge discontinuities and have produced regionally significant volumes of lava. And

  Authors

  V.D. Wanless, M.R. Perfit, W.I. Ridley, E. Klein

  January 1, 2010

  Influence of sulfur-bearing polyatomic species on high precision measurements of Cu isotopic composition

  An increased interest in high precision Cu isotope ratio measurements using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) has developed recently for various natural geologic systems and environmental applications, these typically contain high concentrations of sulfur, particularly in the form of sulfate (SO42-) and sulfide (S). For example, Cu, Fe, and Zn concentrations

  Authors

  M.J. Pribil, R. B. Wanty, W.I. Ridley, D.M. Borrok

  October 17, 2009

  A New Occurrence Model for National Assessment of Undiscovered Volcanogenic Massive Sulfide Deposits

  Volcanogenic massive sulfide (VMS) deposits are very significant current and historical resources of Cu-Pb-Zn-Au-Ag, are active exploration targets in several areas of the United States and potentially have significant environmental effects. This new USGS VMS deposit model provides a comprehensive review of deposit occurrence and ore genesis, and fully integrates recent advances in the understandi

  Authors

  W.C. Pat Shanks, Cynthia Dusel-Bacon, Randolph Koski, Lisa A. Morgan, Dan Mosier, Nadine M. Piatak, Ian Ridley, Robert R. Seal, Klaus J. Schulz, John F. Slack, Roland Thurston

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  Geology, Energy & Minerals Science Center