Denver Microbeam Laboratory

Publications

Filter Total Items: 63
Year Published: 2018

Method to characterize inorganic particulates in lung tissue biopsies using field emission scanning electron microscopy

Humans accumulate large numbers of inorganic particles in their lungs over a lifetime. Whether this causes or contributes to debilitating disease over a normal lifespan depends on the type and concentration of the particles. We developed and tested a protocol for in situ characterization of the types and distribution of inorganic...

Lowers, Heather A.; Breit, George N.; Strand, Matthew; Pillers, Renee M.; Meeker, Gregory P.; Todorov, Todor I.; Plumlee, Geoffrey S.; Wolf, Ruth E.; Robinson, Maura; Parr, Jane; Miller, Robert J.; Groshong, Steve; Green, Francis; Rose, Cecile
Heather A. Lowers, G. N. Breit, M. Strand, R. M. Pillers, G. P. Meeker, T. I. Todorov, G. S. Plumlee, R. E. Wolf, M. Robinson, J. Parr, R. Miller, S. Groshong, F. Green & C. Rose (2018) Method to characterize inorganic particulates in lung tissue biopsies using field emission scanning electron microscopy, Toxicology Mechanisms and Methods, DOI: 10.1080/15376516.2018.1449042

Year Published: 2017

Geochemistry and mineralogy of the Dotson Zone HREE deposit in the Bokan Mountain peralkaline igneous complex, southeastern Alaska, USA

The Bokan Mountain igneous complex (BMIC) is a typical example of a peralkaline intrusive system that has evolved to the point of developing late stage HFSE- and REE-rich silicic pegmatites and dikes. The Dotson Zone comprises a series of felsic dikes that extend from the southeast margin of the composite pluton and may represent an important...

Taylor, Cliff D.; Lowers, Heather A.; Adams, David; Robinson, R. James
Taylor, C.D., Lowers, H.A., Adams, D.T., and Robinson, R.J., 2017, Geochemistry and mineralogy of the Dotson Zone HREE deposit in the Bokan Mountain peralkaline igneous complex, southeastern Alaska, USA. Proceedings of the 14th SGA Biennial Meeting, 20-23 August 2017, Quebec City, Canada, p. 1329-1332.

Year Published: 2017

USGS Spectral Library Version 7

We have assembled a library of spectra measured with laboratory, field, and airborne spectrometers. The instruments used cover wavelengths from the ultraviolet to the far infrared (0.2 to 200 microns [μm]). Laboratory samples of specific minerals, plants, chemical compounds, and manmade materials were measured. In many cases, samples were purified...

Kokaly, Raymond F.; Clark, Roger N.; Swayze, Gregg A.; Livo, K. Eric; Hoefen, Todd M.; Pearson, Neil C.; Wise, Richard A.; Benzel, William M.; Lowers, Heather A.; Driscoll, Rhonda L.; Klein, Anna J.
Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035.

Year Published: 2016

The distribution and composition of REE-bearing minerals in placers of the Atlantic and Gulf coastal plains, USA

Rare earth element (REE) resources are currently of great interest because of their importance as raw materials for high-technology manufacturing. The REE-phosphates monazite (light REE enriched) and xenotime (heavy REE enriched) resist weathering and can accumulate in placer deposits as part of the heavy mineral assemblage. The Atlantic and Gulf...

Bern, Carleton R.; Shah, Anjana K.; Benzel, William M.; Lowers, Heather A.
Bern, C.R., Shah, A.K., Benzel, W.M., Lowers, H.A. 2016. The distribution and composition of REE-bearing minerals in placers of the Atlantic and Gulf coastal plains, USA. Journal of Geochemical Exploration, doi:10.1016/j.gexplo.2015.12.011

Year Published: 2016

Ore mineralogy and textural zonation in the world-class epithermal Waihi Vein System, Hauraki Goldfield

The Waihi district in the Hauraki Goldfield of New Zealand contains adularia-sericite epithermal gold-silver veins that have produced more than 7.7 Moz gold. The outermost veins of the district (Martha, Favona, Moonlight, and Cowshed) contain abundant colloform, cherty, and black quartz fill textures, with minor crustiform and massive quartz. The...

Mauk, Jeffrey L.; Skinner, Erin G; Fyfe, Sarah J; Menzies, Andrew H; Lowers, Heather A.; Koenig, Alan E.
Mauk, J.L., Skinner, E.G., Fyfe, S.J., Menzies, A.H., Lowers, H., and Koenig, A., 2016, Ore mineralogy and textural zonation in the world-class epithermal Waihi vein system, New Zealand: in Christie, A.B., ed., AusIMM Monograph 31: Mineral Deposits of New Zealand—Exploration and Research, p. 293-301.

Year Published: 2015

Petrology and diagenetic history of the upper shale member of the Late Devonian-Early Mississippian Bakken Formation, Williston Basin, North Dakota

The organic-rich upper shale member of the upper Devonian–lower Mississippian Bakken Formation (Williston Basin, North Dakota, USA) has undergone significant diagenetic alteration, irrespective of catagenesis related to hydrocarbon generation. Alteration includes precipitation of numerous cements, replacement of both detrital and authigenic...

Neil S. Fishman; Sven O. Egenhoff; Boehlke, Adam; Lowers, Heather A.
Fishman, N.S., Egenhoff, S.O., Boehlke, A., and Lowers, H.A., 2015, Petrology and diagenetic history of the upper shale member of the Late Devonian-Early Mississippian Bakken Formation, Williston Basin, North Dakota in Larsen, D., Egenhoff, S.O., Fishman, N.S., ed., Paying Attention to Mudrocks: Priceless!: Geological Society of America Special Papers, Vol. 515, p. 125-151. Available at: http://dx.doi.org/10.1130/2015.2515(07)

Year Published: 2015

Mining for metals in society's waste

Metals are crucial to society and enable our modern standard of living. Look around and you can't help but see products made of metals. For instance, a typical gasoline-powered automobile contains over a ton of iron and steel, 240 pounds of aluminum, 42 pounds of copper, 41 pounds of silicon, 22 pounds of zinc and more than 30 other mineral...

Smith, Kathleen S.; Plumlee, Geoffrey S.; Hageman, Philip L.
Smith, K.S., Hageman, P.L., and Plumlee, G.S., 2015, Mining for metals in society's wastes: The Conversation US, October 1, 2015, https://theconversation.com/mining-for-metals-in-societys-waste-43766.

Year Published: 2015

Lithostratigraphic, borehole-geophysical, hydrogeologic, and hydrochemical data from the East Bay Plain, Alameda County, California

The U.S. Geological Survey, in cooperation with the East Bay Municipal Utility District, carried out an investigation of aquifer-system deformation associated with groundwater-level changes at the Bayside Groundwater Project near the modern San Francisco Bay shore in San Lorenzo, California. As a part of the Bayside Groundwater Project, East Bay...

Sneed, Michelle; Orlando, Patricia v.P.; Borchers, James W.; Everett, Rhett; Solt, Michael; McGann, Mary; Lowers, Heather; Mahan, Shannon
Sneed, Michelle, Orlando, P.v.P., Borchers, J.W., Everett, Rhett, Solt, Mike, McGann, Mary, Lowers, Heather, and Mahan, Shannon, 2015, Lithostratigraphic, borehole-geophysical, hydrogeologic, and hydrochemical data from the East Bay Plain, Alameda County, California: U.S. Geological Survey Data Series 890, 56 p., http://dx.doi.org/10.3133/ds890.

Year Published: 2015

Sedimentology of SPICE (Steptoean positive carbon isotope excursion): A high-resolution trace fossil and microfabric analysis of the middle to late Cambrian Alum Shale Formation, southern Sweden

The Cambrian Alum Shale Formation in the Andrarum-3 core from Scania, southern Sweden, consists of black siliciclastic mudstone with minor carbonate intercalations. Four facies comprise three siliciclastic mudstones and one fine-grained carbonate. The facies reflect deposition along a transect from deep ramp to basin on a Cambrian shelf. The three...

Egenhoff, Sven; Fishman, Neil; Ahlberg, Per; Maletz, Jorg; Jackson, Allison; Kolte, Ketki; Lowers, Heather A.; Mackie, James; Newby, Warren; Petrowsky, Matthew
Sven O. Egenhoff, Neil S. Fishman, Per Ahlberg, Jörg Maletz, Allison Jackson, Ketki Kolte, Heather Lowers, James Mackie, Warren Newby, Matthew Petrowsky, 2015. "Sedimentology of SPICE (Steptoean positive carbon isotope excursion): A high-resolution trace fossil and microfabric analysis of the middle to late Cambrian Alum Shale Formation, southern Sweden", Paying Attention to Mudrocks: Priceless!, Daniel Larsen, Sven O. Egenhoff, Neil S. Fishman, Hess Corporation

Year Published: 2015

Pre-eruptive conditions of the Hideaway Park topaz rhyolite: Insights into metal source and evolution of magma parental to the Henderson porphyry molybdenum deposit, Colorado

The Hideaway Park tuff is the only preserved extrusive volcanic unit related to the Red Mountain intrusive complex, which produced the world-class Henderson porphyry Mo deposit. Located within the Colorado Mineral Belt, USA, Henderson is the second largest Climax-type Mo deposit in the world, and is therefore an excellent location to investigate...

Mercer, Celestine N.; Hofstra, Albert H.; Todorov, Todor I.; Roberge, Julie; Burgisser, Alain; Adams, David T.; Cosca, Michael A.
Mercer, C. N., Hofstra, A. H., Todorov, T. I., Roberge, J., Burgisser, A., Adams, D. T., & Cosca, M. (2015). Pre-Eruptive Conditions of the Hideaway Park Topaz Rhyolite: Insights into Metal Source and Evolution of Magma Parental to the Henderson Porphyry Molybdenum Deposit, Colorado. Journal of Petrology, 56, 4, 645-679.

Year Published: 2015

Characterisation of a natural quartz crystal as a reference material for microanalytical determination of Ti, Al, Li, Fe, Mn, Ga and Ge

A natural smoky quartz crystal from Shandong province, China, was characterised by laser ablation ICP-MS, electron probe microanalysis (EPMA) and solution ICP-MS to determine the concentration of twenty-four trace and ultra trace elements. Our main focus was on Ti quantification because of the increased use of this element for titanium-in-quartz (...

Audetat, Andreas; Garbe-Schonberg, Dieter; Kronz, Andreas; Pettke, Thomas; Rusk, Brian G.; Donovan, John J.; Lowers, Heather
Audétat, A., Garbe-Schönberg, D., Kronz, A., Pettke, T., Rusk, B., Donovan, J. J. and Lowers, H. A. (2015), Characterisation of a Natural Quartz Crystal as a Reference Material for Microanalytical Determination of Ti, Al, Li, Fe, Mn, Ga and Ge. Geostandards and Geoanalytical Research, 39: 171–184. doi: 10.1111/j.1751-908X.2014.00309.x

Year Published: 2015

Evaluation of selected static methods used to estimate element mobility, acid-generating and acid-neutralizing potentials associated with geologically diverse mining wastes

A comparison study of selected static leaching and acid–base accounting (ABA) methods using a mineralogically diverse set of 12 modern-style, metal mine waste samples was undertaken to understand the relative performance of the various tests. To complement this study, in-depth mineralogical studies were conducted in order to elucidate the...

Hageman, Philip L.; Seal, Robert R.; Diehl, Sharon F.; Piatak, Nadine M.; Lowers, Heather
Hageman,Philip L., Robert R. Seal, Sharon F. Diehl, Nadine M. Piatak, Heather A. Lowers, Evaluation of selected static methods used to estimate element mobility, acid-generating and acid-neutralizing potentials associated with geologically diverse mining wastes, Applied Geochemistry, Available online 16 January 2015, ISSN 0883-2927, http://dx.doi.org/10.1016/j.apgeochem.2014.12.007. (http://www.sciencedirect.com/science/article/pii/S0883292714003060)