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
Iron Hill (Powderhorn) carbonatite complex, Gunnison County, CO - A potential source of several uncommon mineral resources Iron Hill (Powderhorn) carbonatite complex, Gunnison County, CO - A potential source of several uncommon mineral resources
The Iron Hill (Powderhorn) carbonatite complex is a 31-kM2 (12-sq mile) alkalic intrusion located about 35 km (22 miles) south-southwest of Gunnison, CO. The intrusion has been well studied and described because of its classic petrology and architecture ofa carbonatite-alkalic complex. The complex is also noteworthy because it contains enrichments of titanium, rare earth elements...
Authors
B. S. Van Gosen, H.A. Lowers
Arsenic incorporation into authigenic pyrite, Bengal Basin sediment, Bangladesh Arsenic incorporation into authigenic pyrite, Bengal Basin sediment, Bangladesh
Sediment from two deep boreholes (∼400 m) approximately 90 km apart in southern Bangladesh was analyzed by X-ray absorption spectroscopy (XAS), total chemical analyses, chemical extractions, and electron probe microanalysis to establish the importance of authigenic pyrite as a sink for arsenic in the Bengal Basin. Authigenic framboidal and massive pyrite (median values 1500 and 3200 ppm...
Authors
Heather A. Lowers, George N. Breit, Andrea L. Foster, John W. Whitney, James Yount, Nehal Uddin, Ad. Atual Muneem
Mineralogy and Morphology of Amphiboles Observed in Soils and Rocks in El Dorado Hills, California Mineralogy and Morphology of Amphiboles Observed in Soils and Rocks in El Dorado Hills, California
From the Executive Summary: At the request of the U.S. Environmental Protection Agency (USEPA), the U.S. Geological Survey (USGS) has conducted an independent study of amphiboles in rocks and soils in the El Dorado Hills, California, area. The purpose of this study is to investigate specific issues regarding the presence of 'naturally occurring asbestos' raised by an USEPA activity-based...
Authors
G.P. Meeker, H.A. Lowers, G.A. Swayze, B. S. Van Gosen, S. J. Sutley, I. K. Brownfield
Compositional data for Bengal delta sediment collected from boreholes at Srirampur, Kachua, Bangladesh Compositional data for Bengal delta sediment collected from boreholes at Srirampur, Kachua, Bangladesh
Processes active within sediment of the Bengal delta have attracted world concern because of the locally high content of arsenic dissolved in ground water drawn from that sediment. Sediment samples were collected from two boreholes in Srirampur village, Kachua upazila, Chandphur district, Bangladesh, to investigate the processes contributing to arsenic contamination. The samples were
Authors
George N. Breit, James C. Yount, Nehal Uddin, Ad. Atual Muneem, Heather Lowers, Rhonda L. Driscoll, John W. Whitney
The use of synthetic jarosite as an analog for natural jarosite The use of synthetic jarosite as an analog for natural jarosite
The presence of jarosite in soil or mining waste is an indicator of acidic sulfate-rich conditions. Physical and chemical properties of synthetic jarosites are commonly used as analogs in laboratory studies to determine solubility and acid-generation of naturally occurring jarosites. In our work we have mineralogically and chemically characterized both natural and synthetic jarosites...
Authors
George A. Desborough, Kathleen S. Smith, Heather A. Lowers, Gregg A. Swayze, Jane M. Hammarstrom, Sharon F. Diehl, Rhonda L. Driscoll, Reinhard W. Leinz
Not-so-routine electron probe microanalyses of jarosite Not-so-routine electron probe microanalyses of jarosite
No abstract available.
Authors
Heather Lowers, George A. Desborough, Jane M. Hammarstrom, Gregg A. Swayze, Kathleen S. Smith, Sharon F. Diehl
Particle atlas of World Trade Center dust Particle atlas of World Trade Center dust
The United States Environmental Protection Agency (EPA) has begun a reassessment of the presence of World Trade Center (WTC) dust in residences, public buildings, and office spaces in New York City, New York. Background dust samples collected from residences, public buildings, and office spaces will be analyzed by multiple laboratories for the presence of WTC dust. Other laboratories are...
Authors
Heather Lowers, Gregory P. Meeker
Analysis of background residential dust for World Trade Center signature components using scanning electron microscopy and x-ray microanalysis Analysis of background residential dust for World Trade Center signature components using scanning electron microscopy and x-ray microanalysis
No abstract available.
Authors
Heather Lowers, Gregory P. Meeker, Isabelle K. Brownfield
Determination of a diagnostic signature for World Trade Center dust using scanning electron microscopy point counting techniques Determination of a diagnostic signature for World Trade Center dust using scanning electron microscopy point counting techniques
No abstract available.
Authors
Gregory P. Meeker, Amy M. Bern, Heather Lowers, Isabelle K. Brownfield
The composition of coexisting jarosite-group minerals and water from the Richmond mine, Iron Mountain, California The composition of coexisting jarosite-group minerals and water from the Richmond mine, Iron Mountain, California
Jarosite-group minerals accumulate in the form of stalactites and fine-grained mud on massive pyrite in the D drift of the Richmond mine, Iron Mountain, California. Water samples were collected by placing beakers under the dripping stalactites and by extracting pore water from the mud using a centrifuge. The water is rich in Fe3+ and SO4 2−, with a pH of approximately 2.1, which is...
Authors
Heather E. Jamieson, Clare Robinson, Charles N. Alpers, D. Kirk Nordstrom, Alexei Poustovetov, Heather A. Lowers
Differentiation of commercial vermiculite based on statistical analysis of bulk chemical data: Fingerprinting vermiculite from Libby, Montana U.S.A Differentiation of commercial vermiculite based on statistical analysis of bulk chemical data: Fingerprinting vermiculite from Libby, Montana U.S.A
Major-, minor-, and trace-element compositions, as determined by X-ray fluorescence (XRF) analysis, were obtained on 34 samples of vermiculite to ascertain whether chemical differences exist to the extent of determining the source of commercial products. The sample set included ores from four deposits, seven commercially available garden products, and insulation from four attics. The...
Authors
M. E. Gunter, E. Singleton, B.R. Bandli, H.A. Lowers, G.P. Meeker
Science and Products
Filter Total Items: 31
No Result Found
Filter Total Items: 106
Iron Hill (Powderhorn) carbonatite complex, Gunnison County, CO - A potential source of several uncommon mineral resources Iron Hill (Powderhorn) carbonatite complex, Gunnison County, CO - A potential source of several uncommon mineral resources
The Iron Hill (Powderhorn) carbonatite complex is a 31-kM2 (12-sq mile) alkalic intrusion located about 35 km (22 miles) south-southwest of Gunnison, CO. The intrusion has been well studied and described because of its classic petrology and architecture ofa carbonatite-alkalic complex. The complex is also noteworthy because it contains enrichments of titanium, rare earth elements...
Authors
B. S. Van Gosen, H.A. Lowers
Arsenic incorporation into authigenic pyrite, Bengal Basin sediment, Bangladesh Arsenic incorporation into authigenic pyrite, Bengal Basin sediment, Bangladesh
Sediment from two deep boreholes (∼400 m) approximately 90 km apart in southern Bangladesh was analyzed by X-ray absorption spectroscopy (XAS), total chemical analyses, chemical extractions, and electron probe microanalysis to establish the importance of authigenic pyrite as a sink for arsenic in the Bengal Basin. Authigenic framboidal and massive pyrite (median values 1500 and 3200 ppm...
Authors
Heather A. Lowers, George N. Breit, Andrea L. Foster, John W. Whitney, James Yount, Nehal Uddin, Ad. Atual Muneem
Mineralogy and Morphology of Amphiboles Observed in Soils and Rocks in El Dorado Hills, California Mineralogy and Morphology of Amphiboles Observed in Soils and Rocks in El Dorado Hills, California
From the Executive Summary: At the request of the U.S. Environmental Protection Agency (USEPA), the U.S. Geological Survey (USGS) has conducted an independent study of amphiboles in rocks and soils in the El Dorado Hills, California, area. The purpose of this study is to investigate specific issues regarding the presence of 'naturally occurring asbestos' raised by an USEPA activity-based...
Authors
G.P. Meeker, H.A. Lowers, G.A. Swayze, B. S. Van Gosen, S. J. Sutley, I. K. Brownfield
Compositional data for Bengal delta sediment collected from boreholes at Srirampur, Kachua, Bangladesh Compositional data for Bengal delta sediment collected from boreholes at Srirampur, Kachua, Bangladesh
Processes active within sediment of the Bengal delta have attracted world concern because of the locally high content of arsenic dissolved in ground water drawn from that sediment. Sediment samples were collected from two boreholes in Srirampur village, Kachua upazila, Chandphur district, Bangladesh, to investigate the processes contributing to arsenic contamination. The samples were
Authors
George N. Breit, James C. Yount, Nehal Uddin, Ad. Atual Muneem, Heather Lowers, Rhonda L. Driscoll, John W. Whitney
The use of synthetic jarosite as an analog for natural jarosite The use of synthetic jarosite as an analog for natural jarosite
The presence of jarosite in soil or mining waste is an indicator of acidic sulfate-rich conditions. Physical and chemical properties of synthetic jarosites are commonly used as analogs in laboratory studies to determine solubility and acid-generation of naturally occurring jarosites. In our work we have mineralogically and chemically characterized both natural and synthetic jarosites...
Authors
George A. Desborough, Kathleen S. Smith, Heather A. Lowers, Gregg A. Swayze, Jane M. Hammarstrom, Sharon F. Diehl, Rhonda L. Driscoll, Reinhard W. Leinz
Not-so-routine electron probe microanalyses of jarosite Not-so-routine electron probe microanalyses of jarosite
No abstract available.
Authors
Heather Lowers, George A. Desborough, Jane M. Hammarstrom, Gregg A. Swayze, Kathleen S. Smith, Sharon F. Diehl
Particle atlas of World Trade Center dust Particle atlas of World Trade Center dust
The United States Environmental Protection Agency (EPA) has begun a reassessment of the presence of World Trade Center (WTC) dust in residences, public buildings, and office spaces in New York City, New York. Background dust samples collected from residences, public buildings, and office spaces will be analyzed by multiple laboratories for the presence of WTC dust. Other laboratories are...
Authors
Heather Lowers, Gregory P. Meeker
Analysis of background residential dust for World Trade Center signature components using scanning electron microscopy and x-ray microanalysis Analysis of background residential dust for World Trade Center signature components using scanning electron microscopy and x-ray microanalysis
No abstract available.
Authors
Heather Lowers, Gregory P. Meeker, Isabelle K. Brownfield
Determination of a diagnostic signature for World Trade Center dust using scanning electron microscopy point counting techniques Determination of a diagnostic signature for World Trade Center dust using scanning electron microscopy point counting techniques
No abstract available.
Authors
Gregory P. Meeker, Amy M. Bern, Heather Lowers, Isabelle K. Brownfield
The composition of coexisting jarosite-group minerals and water from the Richmond mine, Iron Mountain, California The composition of coexisting jarosite-group minerals and water from the Richmond mine, Iron Mountain, California
Jarosite-group minerals accumulate in the form of stalactites and fine-grained mud on massive pyrite in the D drift of the Richmond mine, Iron Mountain, California. Water samples were collected by placing beakers under the dripping stalactites and by extracting pore water from the mud using a centrifuge. The water is rich in Fe3+ and SO4 2−, with a pH of approximately 2.1, which is...
Authors
Heather E. Jamieson, Clare Robinson, Charles N. Alpers, D. Kirk Nordstrom, Alexei Poustovetov, Heather A. Lowers
Differentiation of commercial vermiculite based on statistical analysis of bulk chemical data: Fingerprinting vermiculite from Libby, Montana U.S.A Differentiation of commercial vermiculite based on statistical analysis of bulk chemical data: Fingerprinting vermiculite from Libby, Montana U.S.A
Major-, minor-, and trace-element compositions, as determined by X-ray fluorescence (XRF) analysis, were obtained on 34 samples of vermiculite to ascertain whether chemical differences exist to the extent of determining the source of commercial products. The sample set included ores from four deposits, seven commercially available garden products, and insulation from four attics. The...
Authors
M. E. Gunter, E. Singleton, B.R. Bandli, H.A. Lowers, G.P. Meeker