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Oxygen isotope analysis
Experimental determination of the proportion of a given stable oxygen isotope in a sample.
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PDF Isotope and Chemical Methods in Support of the U.S. Geological Survey Science Strategy, 2003-2008 [More info]
Types of geochemical and isotopic analyses used in conducting a variety of research studies in USGS, primarily focused on mineral deposit formation.
Carolina slate belt gold deposits in Virginia, North Carolina, South Carolina, and Georgia [More info]
Report of research on the Carolina slate belt and gold deposits in Virginia, North Carolina, South Carolina, and Georgia with geologic mapping, mineralogic, geochemical, and fluid evolution studies, radiogenic dating, and stable isotope studies.
PDF Devils Hole, Nevada--A Primer [More info]
Explains the important paleoclimatic information we have obtained from this subaqueous cavern. The time-series data show important contrasts with what would be predicted from orbital theory, provoking extensive scientific discussion.
PDF Evidence of multidecadal climate variability in the Gulf of Mexico [More info]
Direct measurement of an important indicator of interannual variability is extended, using geological proxy measures, farther back in time to well before modern measurements were made. This tells us about the history of climate variability.
PDF Nitrate concentrations and potential sources in the Barton Springs segment of the Edwards aquifer and its contributing zone, Central Texas [More info]
The area contributing recharge to this aquifer is undergoing rapid growth, generating more wastewater. We found that nitrate, a major component of wastewater and a nutrient that can degrade water quality, has increased in the creeks in this area.
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.
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