Heather A Lowers
Heather Lowers is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 31
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Filter Total Items: 106
Distribution of arsenic, selenium, and other trace elements in high pyrite Appalachian coals: evidence for multiple episodes of pyrite formation Distribution of arsenic, selenium, and other trace elements in high pyrite Appalachian coals: evidence for multiple episodes of pyrite formation
Pennsylvanian coals in the Appalachian Basin host pyrite that is locally enriched in potentially toxic trace elements such as As, Se, Hg, Pb, and Ni. A comparison of pyrite-rich coals from northwestern Alabama, eastern Kentucky, and West Virginia reveals differences in concentrations and mode of occurrence of trace elements in pyrite. Pyrite occurs as framboids, dendrites, or in massive
Authors
S. F. Diehl, M. B. Goldhaber, A.E. Koenig, H.A. Lowers, L.F. Ruppert
A new basaltic glass microanalytical reference material for multiple techniques A new basaltic glass microanalytical reference material for multiple techniques
The U.S. Geological Survey (USGS) has been producing reference materials since the 1950s. Over 50 materials have been developed to cover bulk rock, sediment, and soils for the geological community. These materials are used globally in geochemistry, environmental, and analytical laboratories that perform bulk chemistry and/or microanalysis for instrument calibration and quality assurance...
Authors
Steve Wilson, Alan Koenig, Heather Lowers
Improved electron probe microanalysis of trace elements in quartz Improved electron probe microanalysis of trace elements in quartz
Quartz occurs in a wide range of geologic environments throughout the Earth's crust. The concentration and distribution of trace elements in quartz provide information such as temperature and other physical conditions of formation. Trace element analyses with modern electron-probe microanalysis (EPMA) instruments can achieve 99% confidence detection of ~100 ppm with fairly minimal effort...
Authors
John J. Donovan, Heather Lowers, Brian G. Rusk
Visualizing trace element distribution in quartz using cathodoluminescence, electron microprobe, and laser ablation-inductively coupled plasma-mass spectrometry Visualizing trace element distribution in quartz using cathodoluminescence, electron microprobe, and laser ablation-inductively coupled plasma-mass spectrometry
Cathodoluminescent (CL) textures in quartz reveal successive histories of the physical and chemical fluctuations that accompany crystal growth. Such CL textures reflect trace element concentration variations that can be mapped by electron microprobe or laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Trace element maps in hydrothermal quartz from four different...
Authors
Brian Rusk, Alan Koenig, Heather Lowers
Mineralogic sources of metals in leachates from the weathering of sedex, massive sulfide, and vein deposit mining wastes Mineralogic sources of metals in leachates from the weathering of sedex, massive sulfide, and vein deposit mining wastes
Weathered mine waste consists of oxidized primary minerals and chemically unstable secondary phases that can be sources of readily soluble metals and acid rock drainage. Elevated concentrations of metals such as Cd, Cu, Fe, Mn, Ni, Pb, and Zn are observed in deionized water-based leachate solutions derived from complex sedex and Cu-Pb-Zn mine wastes. Leachate (USGS FLT) from the...
Authors
S. F. Diehl, P. L. Hageman, R.R. Seal, N.M. Piatak, H. Lowers
Chemical and morphological comparison of erionite from Oregon, North Dakota, and Turkey Chemical and morphological comparison of erionite from Oregon, North Dakota, and Turkey
Erionite, a fibrous zeolite, occurs in pediment gravel deposits near Killdeer Mountain, North Dakota. Material from these pediment deposits has been excavated for use as roadbed throughout Dunn County, North Dakota. Erionite also occurs in the Cappadocian region of Turkey, where a link between malignant mesothelioma and inhalation of this mineral has been established. The U.S...
Authors
Heather Lowers, David T. Adams, Gregory P. Meeker, Constance J. Nutt
Mineralogical and chemical characteristics of some natural jarosites Mineralogical and chemical characteristics of some natural jarosites
This paper presents a detailed study of the mineralogical, microscopic, thermal, and spectral characteristics of jarosite and natrojarosite minerals. Systematic mineralogic and chemical examination of a suite of 32 natural stoichiometric jarosite and natrojarosite samples from diverse supergene and hydrothermal environments indicates that there is only limited solid solution between Na...
Authors
George A. Desborough, Kathleen S. Smith, Heather A. Lowers, Gregg A. Swayze, Jane M. Hammarstrom, Sharon F. Diehl, Reinhard W. Leinz, Rhonda L. Driscoll
In vitro studies evaluating leaching of mercury from mine waste calcine using simulated human body fluids In vitro studies evaluating leaching of mercury from mine waste calcine using simulated human body fluids
In vitro bioaccessibility (IVBA) studies were carried out on samples of mercury (Hg) mine-waste calcine (roasted Hg ore) by leaching with simulated human body fluids. The objective was to estimate potential human exposure to Hg due to inhalation of airborne calcine particulates and hand-to-mouth ingestion of Hg-bearing calcines. Mine waste calcines collected from Hg mines at Almadén...
Authors
John E. Gray, Geoffrey S. Plumlee, Suzette A. Morman, Pablo L. Higueras, James G. Crock, Heather A. Lowers, Mark L. Witten
Response to the comment by Henry Kahn and Dennis Santella on a summary of the development of a signature for detection of residual dust from the collapse of the World Trade Center buildings Response to the comment by Henry Kahn and Dennis Santella on a summary of the development of a signature for detection of residual dust from the collapse of the World Trade Center buildings
A response by Gregory P. Meeker and colleagues to a commentary on their article on the development of a signature for detection of residual dust from the collapse of the World Trade Center buildings is presented
Authors
Gregory P. Meeker, Heather Lowers, Paul J. Lioy, Morton Lippmann
Europium-rich dark monazite - a potential new ore mineral for Alaska, USA? Europium-rich dark monazite - a potential new ore mineral for Alaska, USA?
No abstract available.
Authors
Richard B. Tripp, William Benzel, David T. Adams, Heather A. Lowers, Gregory K. Lee, Elizabeth A. Bailey
Particle Size Characterization of Water-Elutriated Libby Amphibole 2000 and RTI International Amosite Particle Size Characterization of Water-Elutriated Libby Amphibole 2000 and RTI International Amosite
This report presents data on particle characterization analyzed by scanning electron microscopy on Libby amphibole collected by the U.S. Geological Survey in 2000 (LA2000) and amosite material collected by RTI International (RTI amosite). The particle characterization data were generated to support a portion of the Libby Action Plan. Prior to analysis, the raw LA2000 and RTI amosite...
Authors
Heather Lowers, Amy M. Bern
The Iron Hill (Powderhorn) carbonatite complex, Gunnison County, Colorado — A potential source of several uncommon mineral resources The Iron Hill (Powderhorn) carbonatite complex, Gunnison County, Colorado — A potential source of several uncommon mineral resources
A similar version of this slide show was presented on three occasions during 2008: two times to local chapters of the Society for Mining, Metallurgy, and Exploration (SME), as part of SME's Henry Krumb lecture series, and the third time at the Northwest Mining Association's 114th Annual Meeting, held December 1-5, 2008, in Sparks (Reno), Nevada. In 2006, the U.S. Geological Survey (USGS)
Authors
Bradley S. Van Gosen
Science and Products
Filter Total Items: 31
No Result Found
Filter Total Items: 106
Distribution of arsenic, selenium, and other trace elements in high pyrite Appalachian coals: evidence for multiple episodes of pyrite formation Distribution of arsenic, selenium, and other trace elements in high pyrite Appalachian coals: evidence for multiple episodes of pyrite formation
Pennsylvanian coals in the Appalachian Basin host pyrite that is locally enriched in potentially toxic trace elements such as As, Se, Hg, Pb, and Ni. A comparison of pyrite-rich coals from northwestern Alabama, eastern Kentucky, and West Virginia reveals differences in concentrations and mode of occurrence of trace elements in pyrite. Pyrite occurs as framboids, dendrites, or in massive
Authors
S. F. Diehl, M. B. Goldhaber, A.E. Koenig, H.A. Lowers, L.F. Ruppert
A new basaltic glass microanalytical reference material for multiple techniques A new basaltic glass microanalytical reference material for multiple techniques
The U.S. Geological Survey (USGS) has been producing reference materials since the 1950s. Over 50 materials have been developed to cover bulk rock, sediment, and soils for the geological community. These materials are used globally in geochemistry, environmental, and analytical laboratories that perform bulk chemistry and/or microanalysis for instrument calibration and quality assurance...
Authors
Steve Wilson, Alan Koenig, Heather Lowers
Improved electron probe microanalysis of trace elements in quartz Improved electron probe microanalysis of trace elements in quartz
Quartz occurs in a wide range of geologic environments throughout the Earth's crust. The concentration and distribution of trace elements in quartz provide information such as temperature and other physical conditions of formation. Trace element analyses with modern electron-probe microanalysis (EPMA) instruments can achieve 99% confidence detection of ~100 ppm with fairly minimal effort...
Authors
John J. Donovan, Heather Lowers, Brian G. Rusk
Visualizing trace element distribution in quartz using cathodoluminescence, electron microprobe, and laser ablation-inductively coupled plasma-mass spectrometry Visualizing trace element distribution in quartz using cathodoluminescence, electron microprobe, and laser ablation-inductively coupled plasma-mass spectrometry
Cathodoluminescent (CL) textures in quartz reveal successive histories of the physical and chemical fluctuations that accompany crystal growth. Such CL textures reflect trace element concentration variations that can be mapped by electron microprobe or laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Trace element maps in hydrothermal quartz from four different...
Authors
Brian Rusk, Alan Koenig, Heather Lowers
Mineralogic sources of metals in leachates from the weathering of sedex, massive sulfide, and vein deposit mining wastes Mineralogic sources of metals in leachates from the weathering of sedex, massive sulfide, and vein deposit mining wastes
Weathered mine waste consists of oxidized primary minerals and chemically unstable secondary phases that can be sources of readily soluble metals and acid rock drainage. Elevated concentrations of metals such as Cd, Cu, Fe, Mn, Ni, Pb, and Zn are observed in deionized water-based leachate solutions derived from complex sedex and Cu-Pb-Zn mine wastes. Leachate (USGS FLT) from the...
Authors
S. F. Diehl, P. L. Hageman, R.R. Seal, N.M. Piatak, H. Lowers
Chemical and morphological comparison of erionite from Oregon, North Dakota, and Turkey Chemical and morphological comparison of erionite from Oregon, North Dakota, and Turkey
Erionite, a fibrous zeolite, occurs in pediment gravel deposits near Killdeer Mountain, North Dakota. Material from these pediment deposits has been excavated for use as roadbed throughout Dunn County, North Dakota. Erionite also occurs in the Cappadocian region of Turkey, where a link between malignant mesothelioma and inhalation of this mineral has been established. The U.S...
Authors
Heather Lowers, David T. Adams, Gregory P. Meeker, Constance J. Nutt
Mineralogical and chemical characteristics of some natural jarosites Mineralogical and chemical characteristics of some natural jarosites
This paper presents a detailed study of the mineralogical, microscopic, thermal, and spectral characteristics of jarosite and natrojarosite minerals. Systematic mineralogic and chemical examination of a suite of 32 natural stoichiometric jarosite and natrojarosite samples from diverse supergene and hydrothermal environments indicates that there is only limited solid solution between Na...
Authors
George A. Desborough, Kathleen S. Smith, Heather A. Lowers, Gregg A. Swayze, Jane M. Hammarstrom, Sharon F. Diehl, Reinhard W. Leinz, Rhonda L. Driscoll
In vitro studies evaluating leaching of mercury from mine waste calcine using simulated human body fluids In vitro studies evaluating leaching of mercury from mine waste calcine using simulated human body fluids
In vitro bioaccessibility (IVBA) studies were carried out on samples of mercury (Hg) mine-waste calcine (roasted Hg ore) by leaching with simulated human body fluids. The objective was to estimate potential human exposure to Hg due to inhalation of airborne calcine particulates and hand-to-mouth ingestion of Hg-bearing calcines. Mine waste calcines collected from Hg mines at Almadén...
Authors
John E. Gray, Geoffrey S. Plumlee, Suzette A. Morman, Pablo L. Higueras, James G. Crock, Heather A. Lowers, Mark L. Witten
Response to the comment by Henry Kahn and Dennis Santella on a summary of the development of a signature for detection of residual dust from the collapse of the World Trade Center buildings Response to the comment by Henry Kahn and Dennis Santella on a summary of the development of a signature for detection of residual dust from the collapse of the World Trade Center buildings
A response by Gregory P. Meeker and colleagues to a commentary on their article on the development of a signature for detection of residual dust from the collapse of the World Trade Center buildings is presented
Authors
Gregory P. Meeker, Heather Lowers, Paul J. Lioy, Morton Lippmann
Europium-rich dark monazite - a potential new ore mineral for Alaska, USA? Europium-rich dark monazite - a potential new ore mineral for Alaska, USA?
No abstract available.
Authors
Richard B. Tripp, William Benzel, David T. Adams, Heather A. Lowers, Gregory K. Lee, Elizabeth A. Bailey
Particle Size Characterization of Water-Elutriated Libby Amphibole 2000 and RTI International Amosite Particle Size Characterization of Water-Elutriated Libby Amphibole 2000 and RTI International Amosite
This report presents data on particle characterization analyzed by scanning electron microscopy on Libby amphibole collected by the U.S. Geological Survey in 2000 (LA2000) and amosite material collected by RTI International (RTI amosite). The particle characterization data were generated to support a portion of the Libby Action Plan. Prior to analysis, the raw LA2000 and RTI amosite...
Authors
Heather Lowers, Amy M. Bern
The Iron Hill (Powderhorn) carbonatite complex, Gunnison County, Colorado — A potential source of several uncommon mineral resources The Iron Hill (Powderhorn) carbonatite complex, Gunnison County, Colorado — A potential source of several uncommon mineral resources
A similar version of this slide show was presented on three occasions during 2008: two times to local chapters of the Society for Mining, Metallurgy, and Exploration (SME), as part of SME's Henry Krumb lecture series, and the third time at the Northwest Mining Association's 114th Annual Meeting, held December 1-5, 2008, in Sparks (Reno), Nevada. In 2006, the U.S. Geological Survey (USGS)
Authors
Bradley S. Van Gosen