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Geochemical processes
Processes affecting the amount, distribution, or structure of chemical elements in air, water, soil, rocks, and minerals.
Subtopics:
Biodegradation (5 items)
Carbon sequestration (6 items)
Ore formation (1 items)
Reaction transport (1 items)
Related topics:

Results 1 - 18 of 18 listed by similarity [list alphabetically]
PDF Assessing carbon stocks, carbon sequestration, and greenhouse-gas fluxes in ecosystems of the United States under present conditions and future scenarios [More info]
Congress asked us (in the Energy Independence and Security Act of 2007) to figure out how to assess the effects of carbon storage, sequestration, and greenhouse gas fluxes in our ecosystems. Here's how we plan to do that.
PDF Biochar for soil fertility and natural carbon sequestration [More info]
Explains what biochar is and how it is formed, its potential use in both fertilizer and carbon sequestration, and some of the research questions remaining to be addressed before we can utilize it fully in practical ways.
Carbon dioxide and helium discharge from Mammoth Mountain, Long Valley caldera, California [More info]
An explanation of toxic carbon dioxide emissions at Mammoth Mountain in Long Valley caldera, and a description of magmatic helium discharge at the Mammoth Mountain fumarole with photos, maps, and links to other studies.
PDF Carbon Sequestration to Mitigate Climate Change [More info]
Explains the process of carbon sequestration through oceanic, terrestrial, and geologic (underground) mechanisms, with some background information on why this is important.
PDF Development of an assessment methodology for hydrocarbon recovery potential using carbon dioxide and associated carbon sequestration-Workshop findings [More info]
Geologic CO2 sequestration with enhanced oil recovery in existing hydrocarbon reservoirs can increase the U.S. hydrocarbon recoverable resource volume and prevent CO2 release to the atmosphere.
Framework for Assessing the Sustainability of Monitored Natural Attenuation [More info]
Research findings and examples of application to real problems--When can natural processes to reduce, or even destroy, contaminants at toxic waste sites be relied on?
Geochemistry and tracer studies [More info]
Overview of chemical analyses, tracer studies, gas geochemistry, stable isotopes analyses, organic chemistry, and thermometry capabilities at major USGS laboratories with links to technique, equipment, and contacts for each procedure.
PDF Microbial production of natural gas from coal and organic-rich shale [More info]
Explains how natural gas can be formed by microorganisms from geological materials, and how we plan to assess the potential value of this process for improving energy resources.
Organic Geochemistry Laboratory in Denver [More info]
Description of the Denver Organic Geochemistry Laboratory where chemical and geological data is used to research the physical and chemical processes of hydrocarbon generation, migration and accumulation, with links to programs, personnel, and products.
Organic Geochemistry Research Group in Kansas [More info]
The Organic Geochemistry Research Group of the Kansas District focuses on the fate and transport of organic contaminants in the environment with links to objectives, analytical methods, laboratory methods, publications, events, photos, and personnel.
Periodic table page [More info]
An "image map" periodic table and short notes about many isotopes and their applications to illustrate the uses of assorted isotopes in hydrology, geology, and biology.
PDF Sustainability of natural attenuation of nitrate in agricultural aquifers [More info]
Nitrate from fertilizer is degraded by microbial action in the presence of solid minerals. This helps mitigate the effect of the nitrate, but begins to diminish the solid minerals needed. Will the process be sustainable in the long term?
PDF 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.
PDF Tintina gold province study, Alaska and Yukon Territory, 2002-2007 [More info]
New discoveries and modernized extraction methods prompted renewed interest in gold deposits in this part of central Alaska, prompting a variety of studies described here.
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.
PDF U.S. Geological Survey methodology development for ecological carbon assessment and monitoring [More info]
To assess the effectiveness of ecological carbon sequestration, we plan to define ecosystem reporting units, model baseline and potential carbon sequestration, develop spatial models that simulate ecosystems, and integrate remote sensing data.
Wastewater Indicators Shown to Degrade in Streams [More info]
Research findings and examples of application to real problems--the stability of contaminants that indicate human wastewater needs to be considered.
What Mobilizes Arsenic in Ground Water? [More info]
Research findings and examples of application to real problems--chemical reactions between nitrate, iron, and oxygen can affect the mobility of trace amounts of arsenic.
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