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William Ridley (Former Employee)

Science and Products

Filter Total Items: 38

Feasibility study for the quantitative assessment of mineral resources in asteroids 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...
Authors
Laszlo P. Keszthelyi, Justin Hagerty, Amanda Bowers, Karl J. Ellefsen, Trude King, Ian Ridley, David Trilling, Nicholas Moskovitz, Will Grundy
By
Natural Hazards Mission Area, Astrogeology Science Center

Measurement of in situ sulfur isotopes by laser ablation multi-collector ICPMS: opening Pandora’s Box 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...
Authors
William I. Ridley, Michael Pribil, Alan E. Koenig, John F. Slack
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center

Sulfate and sulfide sulfur isotopes (δ34S and δ33S) measured by solution and laser ablation MC-ICP-MS: An enhanced approach using external correction 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 +...
Authors
Michael Pribil, William I. Ridley, Poul Emsbo
By
Geology, Geophysics, and Geochemistry Science Center

Volcanogenic massive sulfide occurrence model Volcanogenic massive sulfide occurrence model

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...
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
By
Geology, 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

Mineralogy and composition of the oceanic mantle 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...
Authors
Keith Putirka, F. J. Ryerson, Michael Perfit, W. Ian Ridley
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

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
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
periodic table with isotopes

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...
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
Non-Traditional Stable Isotopes

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...
Learn More
Bennu mosaic

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
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
ASTRA: ASTeroid Resource Assessment

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
Learn More

Science and Products

Filter Total Items: 38

Feasibility study for the quantitative assessment of mineral resources in asteroids 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...
Authors
Laszlo P. Keszthelyi, Justin Hagerty, Amanda Bowers, Karl J. Ellefsen, Trude King, Ian Ridley, David Trilling, Nicholas Moskovitz, Will Grundy
By
Natural Hazards Mission Area, Astrogeology Science Center

Measurement of in situ sulfur isotopes by laser ablation multi-collector ICPMS: opening Pandora’s Box 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...
Authors
William I. Ridley, Michael Pribil, Alan E. Koenig, John F. Slack
By
Mineral Resources Program, Geology, Energy & Minerals Science Center, Geology, Geophysics, and Geochemistry Science Center

Sulfate and sulfide sulfur isotopes (δ34S and δ33S) measured by solution and laser ablation MC-ICP-MS: An enhanced approach using external correction 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 +...
Authors
Michael Pribil, William I. Ridley, Poul Emsbo
By
Geology, Geophysics, and Geochemistry Science Center

Volcanogenic massive sulfide occurrence model Volcanogenic massive sulfide occurrence model

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...
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
By
Geology, 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

Mineralogy and composition of the oceanic mantle 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...
Authors
Keith Putirka, F. J. Ryerson, Michael Perfit, W. Ian Ridley
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

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
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
periodic table with isotopes

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...
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
Non-Traditional Stable Isotopes

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...
Learn More
Bennu mosaic

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
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center
ASTRA: ASTeroid Resource Assessment

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
Learn More

*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government

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