USGS: Science Topics: geochemistry

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Geochemistry

Study of the distribution of chemical elements and natural compounds on the earth and in the atmosphere and the chemical processes that affect the earth.

Subtopics:
Soil chemistry (4 items)
Water chemistry (120 items)

Geochemical anomaly maps (9 items)

Related topics:

Results 141 - 150 of 175 listed by similarity [list alphabetically]

The carbon cycle in lakes of the Upper Mississippi Basin [More info]: Summary of part of the USGS interdivisional Mississippi Basin Carbon project that will study the changes in climate and the environment through carbon cycle changes recorded in lake sediments in the Upper Mississippi River Basin.
The chronology for the d18O record from Devils Hole, Nevada, extended into the Mid-Holocene [More info]: This study extends the oxygen isotope record of this important paleoclimate record forward in time to cover more recent history, up to 4,500 years before present.
The concept of geologic carbon sequestration [More info]: Explains securing carbon dioxide in deep geologic formations to prevent its release to the atmosphere and contribution to global warming as a greenhouse gas.
The Cottonwood Lake study area, a long-term wetland ecosystem monitoring site [More info]: Here we study effects of climate and groundwater on surface-water levels, the hydrological effects on wetland water chemistry, and the combined effects of climate, hydrology, and water chemistry on plant and animal communities of prairie pothole wetlands.
The Midwest Stream Quality Assessment [More info]: Upcoming interagency study to assess status of ecological conditions, their relationships with contaminants and nutrients, anthropogenic factors affecting these, and develop models that may predict these ecological conditions.
The Stanford-U.S. Geological Survey SHRIMP ion microprobe--a tool for micro-scale chemical and isotopic analysis [More info]: Instrument measures elemental abundance and isotopic ratios in samples as small as a few nanograms. Uses include geochronology, geological thermometry, and trace element geochemistry of geological and biological materials.
The U.S. Geological Survey's TRIGA reactor [More info]: USGS operates a low-enriched uranium-fueled, pool-type reactor located at the Denver Federal Center. We use it for analyses of fissile and fissionable isotopes, geochemical analysis, and geochronology.
Thermal Properties of Methane Gas Hydrates [More info]: This unusual form of hydrocarbons can alter the thermal properties of host sediments; the analysis presented here helps us understand how those sediments might behave under natural or human-induced changes in the environment.
Toxic Substances Hydrology Program [More info]: Homepage for the Toxic Substances Hydrology Program, which provides scientific information on contaminated sites and on human and environmental health. Links to news, topical information, investigations, meetings, publications, and photos.
Toxicity and bioavailability of metals in the Missouri River adjacent to a lead refinery [More info]: Report (PDF format) on an evaluation of the potential environmental impacts of contaminated ground water from a metals refinery adjacent to the Missouri River in Omaha, Nebraska testing water and sediments for contaminants and toxicity.

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