Heather A Lowers
Heather Lowers is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
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Filter Total Items: 113
Epidote from the Zard Mountains, Kharan, Balochistan, Pakistan Epidote from the Zard Mountains, Kharan, Balochistan, Pakistan
The authors received two unusual crystals of epidote from Rock Currier, Jewel Tunnel Imports, in 2012. The mineral specimens were collected at Zard Mountain (Zard Koh), in the central part of the Ruskoh Mountains (Rusk Koh), west of Kharan, Balochistan, Pakistan (written communication, Rock Currier, 2013). The epidote locality was most likely discovered in 2010. These epidote crystals...
Authors
Michael E. Brownfield, Heather Lowers, William K. Betterton
Linking geology and health sciences to assess childhood lead poisoning from artisanal gold mining in Nigeria Linking geology and health sciences to assess childhood lead poisoning from artisanal gold mining in Nigeria
Background: In 2010, Médecins Sans Frontières discovered a lead poisoning outbreak linked to artisanal gold processing in northwestern Nigeria. The outbreak has killed approximately 400 young children and affected thousands more. Objectives: Our aim was to undertake an interdisciplinary geological- and health-science assessment to clarify lead sources and exposure pathways, identify...
Authors
Geoffrey S. Plumlee, James T. Durant, Suzette A. Morman, Antonio Neri, Ruth E. Wolf, Carrie A. Dooyema, Philip L. Hageman, Heather Lowers, Gregory L. Fernette, Gregory P. Meeker, William Benzel, Rhonda L. Driscoll, Cyrus J. Berry, James G. Crock, Harland L. Goldstein, Monique Adams, Casey L. Bartrem, Simba Tirima, Behbod Behrooz, Ian von Lindern, Mary Jean Brown
Mineralogical, chemical, and crystallographic properties of supergene jarosite-group minerals from the Xitieshan Pb-Zn sulfide deposit, northern Tibetan Plateau, China Mineralogical, chemical, and crystallographic properties of supergene jarosite-group minerals from the Xitieshan Pb-Zn sulfide deposit, northern Tibetan Plateau, China
Supergene jarosite-group minerals are widespread in weathering profiles overlying Pb-Zn sulfide ores at Xitieshan, northern Tibetan Plateau, China. They consist predominantly of K-deficient natrojarosite, with lesser amounts of K-rich natrojarosite and plumbojarosite. Electron microprobe (EMP) analyses, scanning electron microcopy (SEM) investigation, and X-ray mapping reveal that the...
Authors
Lei Chen, Jian-Wei Li, Robert O. Rye, William H. Benzel, H.A. Lowers, Ming-Zhong He
The nature of porosity in organic-rich mudstones of the Upper Jurassic Kimmeridge Clay Formation, North Sea, offshore United Kingdom The nature of porosity in organic-rich mudstones of the Upper Jurassic Kimmeridge Clay Formation, North Sea, offshore United Kingdom
Analyses of organic-rich mudstones from wells that penetrated the Upper Jurassic Kimmeridge Clay Formation, offshore United Kingdom, were performed to evaluate the nature of both organic and inorganic rock constituents and their relation to porosity in this world-class source rock. The formation is at varying levels of thermal maturity, ranging from immature in the shallowest core...
Authors
Neil S. Fishman, Paul C. Hackley, Heather Lowers, Ronald J. Hill, Sven O. Egenhoff, Dennis D. Eberl, Alex E. Blum
Geologic and mineralogic controls on acid and metal-rich rock drainage in an alpine watershed, Handcart Gulch, Colorado Geologic and mineralogic controls on acid and metal-rich rock drainage in an alpine watershed, Handcart Gulch, Colorado
The surface and subsurface geology, hydrothermal alteration, and mineralogy of the Handcart Gulch area was studied using map and drill core data as part of a multidisciplinary approach to understand the hydrology and affects of geology on acid-rock drainage in a mineralized alpine watershed. Handcart Gulch was the locus of intense hydrothermal alteration that affected an area of nearly 3...
Authors
Dana J. Bove, Jonathan S. Caine, Heather Lowers
Multiple age components in individual molybdenite grains Multiple age components in individual molybdenite grains
Re–Os geochronology of fractions composed of unsized, coarse, and fine molybdenite from a pod of unusual monazite–xenotime gneiss within a granulite facies paragneiss, Hudson Highlands, NY, yielded dates of 950.5 ± 2.5, 953.8 ± 2.6, and 941.2 ± 2.6 Ma, respectively. These dates are not recorded by co-existing zircon, monazite, or xenotime. SEM–BSE imagery of thin sections and separated...
Authors
John N. Aleinikoff, Robert A. Creaser, Heather Lowers, Charles W. Magee, Richard I. Grauch
Preparation and characterization of "Libby Amphibole" toxicological testing material Preparation and characterization of "Libby Amphibole" toxicological testing material
The U.S. Environmental Protection Agency (USEPA) began work in Libby, Mont. in 1999 when an Emergency Response Team was sent to investigate local concern and media reports regarding asbestos-contaminated vermiculite. Since that time, the site has been granted Superfund status and site remediation to a safe level of asbestos has been ongoing. The amphibole asbestos from the Vermiculite...
Authors
Heather Lowers, Stephen A. Wilson, Todd M. Hoefen, William Benzel, Gregory P. Meeker
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
Science and Products
Filter Total Items: 32
No Result Found
Filter Total Items: 113
Epidote from the Zard Mountains, Kharan, Balochistan, Pakistan Epidote from the Zard Mountains, Kharan, Balochistan, Pakistan
The authors received two unusual crystals of epidote from Rock Currier, Jewel Tunnel Imports, in 2012. The mineral specimens were collected at Zard Mountain (Zard Koh), in the central part of the Ruskoh Mountains (Rusk Koh), west of Kharan, Balochistan, Pakistan (written communication, Rock Currier, 2013). The epidote locality was most likely discovered in 2010. These epidote crystals...
Authors
Michael E. Brownfield, Heather Lowers, William K. Betterton
Linking geology and health sciences to assess childhood lead poisoning from artisanal gold mining in Nigeria Linking geology and health sciences to assess childhood lead poisoning from artisanal gold mining in Nigeria
Background: In 2010, Médecins Sans Frontières discovered a lead poisoning outbreak linked to artisanal gold processing in northwestern Nigeria. The outbreak has killed approximately 400 young children and affected thousands more. Objectives: Our aim was to undertake an interdisciplinary geological- and health-science assessment to clarify lead sources and exposure pathways, identify...
Authors
Geoffrey S. Plumlee, James T. Durant, Suzette A. Morman, Antonio Neri, Ruth E. Wolf, Carrie A. Dooyema, Philip L. Hageman, Heather Lowers, Gregory L. Fernette, Gregory P. Meeker, William Benzel, Rhonda L. Driscoll, Cyrus J. Berry, James G. Crock, Harland L. Goldstein, Monique Adams, Casey L. Bartrem, Simba Tirima, Behbod Behrooz, Ian von Lindern, Mary Jean Brown
Mineralogical, chemical, and crystallographic properties of supergene jarosite-group minerals from the Xitieshan Pb-Zn sulfide deposit, northern Tibetan Plateau, China Mineralogical, chemical, and crystallographic properties of supergene jarosite-group minerals from the Xitieshan Pb-Zn sulfide deposit, northern Tibetan Plateau, China
Supergene jarosite-group minerals are widespread in weathering profiles overlying Pb-Zn sulfide ores at Xitieshan, northern Tibetan Plateau, China. They consist predominantly of K-deficient natrojarosite, with lesser amounts of K-rich natrojarosite and plumbojarosite. Electron microprobe (EMP) analyses, scanning electron microcopy (SEM) investigation, and X-ray mapping reveal that the...
Authors
Lei Chen, Jian-Wei Li, Robert O. Rye, William H. Benzel, H.A. Lowers, Ming-Zhong He
The nature of porosity in organic-rich mudstones of the Upper Jurassic Kimmeridge Clay Formation, North Sea, offshore United Kingdom The nature of porosity in organic-rich mudstones of the Upper Jurassic Kimmeridge Clay Formation, North Sea, offshore United Kingdom
Analyses of organic-rich mudstones from wells that penetrated the Upper Jurassic Kimmeridge Clay Formation, offshore United Kingdom, were performed to evaluate the nature of both organic and inorganic rock constituents and their relation to porosity in this world-class source rock. The formation is at varying levels of thermal maturity, ranging from immature in the shallowest core...
Authors
Neil S. Fishman, Paul C. Hackley, Heather Lowers, Ronald J. Hill, Sven O. Egenhoff, Dennis D. Eberl, Alex E. Blum
Geologic and mineralogic controls on acid and metal-rich rock drainage in an alpine watershed, Handcart Gulch, Colorado Geologic and mineralogic controls on acid and metal-rich rock drainage in an alpine watershed, Handcart Gulch, Colorado
The surface and subsurface geology, hydrothermal alteration, and mineralogy of the Handcart Gulch area was studied using map and drill core data as part of a multidisciplinary approach to understand the hydrology and affects of geology on acid-rock drainage in a mineralized alpine watershed. Handcart Gulch was the locus of intense hydrothermal alteration that affected an area of nearly 3...
Authors
Dana J. Bove, Jonathan S. Caine, Heather Lowers
Multiple age components in individual molybdenite grains Multiple age components in individual molybdenite grains
Re–Os geochronology of fractions composed of unsized, coarse, and fine molybdenite from a pod of unusual monazite–xenotime gneiss within a granulite facies paragneiss, Hudson Highlands, NY, yielded dates of 950.5 ± 2.5, 953.8 ± 2.6, and 941.2 ± 2.6 Ma, respectively. These dates are not recorded by co-existing zircon, monazite, or xenotime. SEM–BSE imagery of thin sections and separated...
Authors
John N. Aleinikoff, Robert A. Creaser, Heather Lowers, Charles W. Magee, Richard I. Grauch
Preparation and characterization of "Libby Amphibole" toxicological testing material Preparation and characterization of "Libby Amphibole" toxicological testing material
The U.S. Environmental Protection Agency (USEPA) began work in Libby, Mont. in 1999 when an Emergency Response Team was sent to investigate local concern and media reports regarding asbestos-contaminated vermiculite. Since that time, the site has been granted Superfund status and site remediation to a safe level of asbestos has been ongoing. The amphibole asbestos from the Vermiculite...
Authors
Heather Lowers, Stephen A. Wilson, Todd M. Hoefen, William Benzel, Gregory P. Meeker
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