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Harry Hess Postdoctoral Research Associate in Geosciences

The Department of Geosciences at Princeton University is accepting applications for a Postdoctoral Research Associate




 



Earth's core formed under more oxidizing conditions than previously proposed
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An international collaboration including researchers from Lawrence Livermore National Laboratory has discovered that Earth's core formed under more oxidizing conditions than previously proposed. Through a series of laser-heated diamond anvil cell experiments at high pressure (350,000 to 700,000 atmospheres of pressure) and temperatures (5,120 to 7,460 degrees Fahrenheit), the team demonstrated that the depletion of siderophile (also known as "iron loving") elements can be produced by core formation under more oxidizing conditions than earlier predictions. More





 Society News


ELEMENTS: Urban Geochemistry
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The December issue (volume 8, issue 6) was taken to press on Dec. 20 and mailed on Jan. 7. It is available online either through GeoScienceWorld or on the Elements Archive. Under the leadership of guest editors Berry Lyons and Russell Harmon, this issue explores the geochemical significance of 21st-century cities and some of the unprecedented challenges they face. In a very short period of time, the majority of the human population has become urban, and by 2050, two out of every three people in the world will live in cities. Because of the very high concentrations of people and the intensity of economic activity in urban areas, the environmental impact is huge compared to that of most other human endeavors.

Featured Geochemical Career Center Postings
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Graduate student opportunities in applied geochemistry research (Multidisciplinary Applied Geochemistry Network, Canada)

Senior Professional Staff - Geoscientist (Nuclear Waste Technical Review Board, Arlington, VA, USA)

Assistant Professor, Chemical Oceanography (Florida State University, Tallahassee, FL, USA)

Postdoctoral Scholar, Dept of Geological Sciences (Indiana University, Bloomington, IN, USA)

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New in GCA (v.101, 15 January 2013)
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Melting experiments on the Udachnaya kimberlite at 6.3–7.5 GPa: Implications for the role of H2O in magma generation and formation of hydrous olivine

Bismuth speciation in hydrothermal fluids: An X-ray absorption spectroscopy and solubility study

Chemical and physical weathering in south Patagonian rivers: A combined Sr–U–Be isotope approach

Halocarbons and other trace heteroatomic organic compounds in volcanic gases from Vulcano (Aeolian Islands, Italy)

Understanding the trends in transition metal sorption by vacancy sites in birnessite

Shock-induced deformation of Shergottites: Shock-pressures and perturbations of magmatic ages on Mars

Controls on the incongruent release of hafnium during weathering of metamorphic and sedimentary catchments

Ab initio prediction of equilibrium boron isotope fractionation between minerals and aqueous fluids at high P and T

The formation and alteration of the Renazzo-like carbonaceous chondrites II: Linking O-isotope composition and oxidation state of chondrule olivine

Lu–Hf isotope systematics of fossil biogenic apatite and their effects on geochronology




 Latest News


Migration 2013
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The 14th International Conference on the Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere will be held at the Brighton Conference Centre in Brighton, U.K., from Sept. 8-13, 2013. The MIGRATION conferences provide an international forum for the timely exchange of scientific information on chemical processes controlling the migration behavior of actinides and fission products in natural aquifer systems. Experimental investigations and predictive modeling of these processes are the main topics of the conferences.

Himalayan glaciers will shrink even if temperatures hold steady
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Come rain or shine, or even snow, some glaciers of the Himalayas will continue shrinking for many years to come. The forecast by Brigham Young University geology professor Summer Rupper comes after her research on Bhutan, a region in the bull's-eye of the monsoonal Himalayas. Published in Geophysical Research Letters, Rupper's most conservative findings indicate that even if climate remained steady, almost 10 percent of Bhutan's glaciers would vanish within the next few decades. What's more, the amount of melt water coming off these glaciers could drop by 30 percent. More

Magma in mantle has deep impact
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Magma forms far deeper than geologists previously thought, according to new research at Rice University. A group led by geologist Rajdeep Dasgupta put very small samples of peridotite under very large pressures in a Rice laboratory to determine that rock can and does liquify, at least in small amounts, as deep as 250 kilometers in the mantle beneath the ocean floor. He said this explains several puzzles that have bothered scientists. More

As planet warms, more lava could find surface
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The effect of volcanic eruptions on climate has been one of the more hotly contested topics in the global warming debate. Seized upon briefly by climate skeptics as an alternative to human-caused warming, eruptions are now understood by mainstream science to result most often in net cooling for a period of up to several years. More

Accurate measurement of VOCs in atmosphere developed
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An analysis of volatile organic compounds (VOCs) in Perth, Australia's, atmosphere by scientists from Curtin University has revealed a reliable method of determining the sources of VOCs. The researchers investigated carbon and hydrogen isotope values of VOCs in various emission sources using a recently developed method involving thermal desorption, gas chromatography and isotope ratio mass spectrometry. More


 

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