A5053892370- Geochemistry and Geologic Mapping
- Heavy metals in environment
- Mine drainage and remediation techniques
- Radioactivity and Radon Measurements
- Disaster Management and Resilience
- Air Quality and Health Impacts
- Fire effects on ecosystems
- Groundwater and Isotope Geochemistry
- Geological and Geochemical Analysis
- Geological Modeling and Analysis
- Geochemistry and Elemental Analysis
- Water Quality and Resources Studies
- Heavy Metal Exposure and Toxicity
- Climate Change and Health Impacts
- Arsenic contamination and mitigation
- Occupational and environmental lung diseases
- Coal and Its By-products
- Flood Risk Assessment and Management
- Metal Extraction and Bioleaching
- earthquake and tectonic studies
- Mercury impact and mitigation studies
- Mining and Resource Management
- Rangeland and Wildlife Management
- Planetary Science and Exploration
- Methane Hydrates and Related Phenomena
United States Geological Survey
2011-2024
Denver Federal Center
2001-2016
United States Department of the Interior
1996-2013
Pacific Island Ecosystems Research Center
2000-2011
University of Castilla-La Mancha
2010
University of Arizona
2010
Geological Society of America
1998-2010
Stanford University
1998
National Institute of Biological Resources
1998
Most research on the effects of wildfires stream water quality has focused suspended sediment and nutrients in streams bodies, relatively little examined trace elements. The purpose this study was two-fold: 1) to determine effect 2009 Station Fire Angeles National Forest northeast Los Angeles, CA element concentrations streams, 2) compare elements post-fire stormflow criteria for aquatic life if reached that can harm life. Pre-storm water-quality samples were collected located inside outside...
Climax-type porphyry molybdenum deposits, as defined here, are extremely rare; thirteen deposits known, all in western North America and ranging age from Late Cretaceous to mainly Tertiary. They consistently found a postsubduction, extensional tectonic setting invariably associated with A-type granites that formed after peak activity of magmatic cycle. The consist ore shells quartz-molybdenite stockwork veins lie above surrounding the apices cupola-like, highly evolved, calc-alkaline granite...
In 2010, Médecins Sans Frontières discovered a lead poisoning outbreak linked to artisanal gold processing in northwestern Nigeria. The has killed approximately 400 young children and affected thousands more.Our aim was undertake an interdisciplinary geological- health-science assessment clarify sources exposure pathways, identify additional toxicants of concern populations at risk, examine potential for similar globally.We applied diverse analytical methods ore samples, soil sweep samples...
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 exposure due inhalation airborne particulates and hand-to-mouth ingestion Hg-bearing calcines. Mine waste calcines collected from mines at Almadén, Spain, Terlingua, Texas, contain sulfide, elemental Hg, soluble compounds, which constitute primary ore or compounds formed during retorting....
The U.S. Geological Survey, Multi Hazards Demonstration Project (MHDP) uses hazards science to improve resiliency of communities natural disasters including earthquakes, tsunamis, wildfires, landslides, floods and coastal erosion. project engages emergency planners, businesses, universities, government agencies, others in preparing for major disasters. also helps set research goals provides decision-making information loss reduction improved resiliency. first public product the MHDP was...
Abstract For see ChemInform in Full Text.
In this paper, we present results of reaction path calculations using the chemical speciation and programs SOLVEQ CHILLER to model possible fluorite deposition mechanisms in Illinois- Kentucky fluorspar district. Input were temperatures, salinities, concentrations major cation anions (Na, K, CI, SO 4 , etc.) dissolved gases (H 2 S, CO hydrothermal fluids, based on published fluid inclusion data unpublished gas compositions. Fluid pH values fluorine various metals then calculated assuming...
Coccidioides immitis and posadasii are causative agents of Valley fever, a serious fungal disease endemic to regions with hot, arid climate in the United States, Mexico, Central South America. The environmental niche spp. is not well defined, it remains unknown whether these fungi primarily associated rodents or grow as saprotrophs soil. To better understand reservoir pathogens, we used systematic soil sampling approach, quantitative PCR (qPCR), culture, whole-genome sequencing, chemical...
The U.S. Geological Survey (USGS) collected ash and burned soils from about 28 sites in southern California wildfire areas (Harris, Witch, Ammo, Santiago, Canyon Grass Valley) Nov. 2 through 9, 2007 (table 1). USGS researchers are applying a wide variety of analytical methods to these samples, with the goal helping identify characteristics wildland suburban that may be concern for their potential adversely affect water quality, human health, endangered species, debris-flow or flooding...
First posted June 2, 2020 For additional information, contact: National Climate Adaptation Science CenterU.S. Geological Survey12201 Sunrise Valley DriveMail Stop 516Reston, VA 20192https://www.usgs.gov/land-resources/climate-adaptation-science-centersContact Pubs Warehouse This report provides an overview of model-based climate science in a risk management context. In addition, it summarizes how the U.S. Survey (USGS) will continue to follow best scientific practices and when results this...
On May 29, 2006, mud and gases began erupting unexpectedly from a vent 150 meters away hydrocarbon exploration well near Sidoarjo, East Java, Indonesia. The eruption, called the LUSI (Lumpur 'mud'-Sidoarjo) volcano, has continued since then at rates as high 160,000 m3 per day. At request of United States Department State, U.S. Geological Survey (USGS) been providing technical assistance to Indonesian Government on geological geochemical aspects eruption. This report presents initial...
An understanding of our fragile environment can begin with a recognition the importance certain elements, commonly called "minerals substances" (such as iron and zinc), in lives humans animals soils that support plants. This is well deserved because these elements are essential for life or optimum health an organism. Some such carbon, hydrogen, oxygen, magnesium, potassium, phosphorus required relatively large amounts by organisms. However, others smaller quantities; referred to trace...
Humans accumulate large numbers of inorganic particles in their lungs over a lifetime. Whether this causes or contributes to debilitating disease normal lifespan depends on the type and concentration particles. We developed tested protocol for situ characterization types distribution biopsied lung tissue from three human groups using field emission scanning electron microscopy (FE-SEM) combined with energy dispersive spectroscopy (EDS). Many distinct particle were recognized among 13 000...