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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


Dust from Africa affects snowfall in California
One of the driest spots on Earth — the Sahara desert — is increasingly responsible for snow and rain half a world away in the western U.S., a new study found. It's no secret that winds carrying dust, soot and even germs make transcontinental journeys through the upper atmosphere that can affect the weather thousands of miles away. Yet little is known about the impact of foreign pollutants on the West Coast, which relies on mountain snowmelt for its water needs.
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ELEMENTS: One Hundred Years of Isotope Geochronology
The February issue (volume 9, issue 1) was taken to press on Feb. 20. It is also available online either through GeoScienceWorld or on the Elements Archive. This latest issue of Elements takes us on a voyage in time, starting with the discovery of radioactivity and carrying us forward to today. We meet the giants the field of geochronology is indebted to. We see the challenges that have been met and those that lie ahead. We are reminded that for a mineral date to have meaning, the context of the mineral analyzed and the rock of which it is a constituent must be thoroughly documented. And this is an overarching theme of all papers in this issue. Getting absolute ages on geological materials has become key in just every field of the Earth sciences. Authors in the seven papers of this issue, under the guest editorship of Dan Condon and Mark Schmitz, explore the state-of-the-art technological advances that have made geochronology a high-precision and high-accuracy science. This issue should follow in the footsteps of the Zircon issue (volume 3, number 1, which is the most highly cited Elements issue.
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Geochemical Career Center Postings
All jobs posted in the Geochemical Career Center are cross-promoted through our Facebook page and right here in Geochemical News.

Maersk Oil Chair in Applied Geophysics (Aarhus University, Aarhus, Denmark)

Organic Geochemist (ExxonMobil Research and Engineering Company, Annandale, NJ, USA)

Postdoctoral opportunities in applied geochemistry research (Multidisciplinary Applied Geochemistry Network, Canada)

Postdoctoral position: FT-ICR mass spectrometry and IR laser spectroscopy of ion clusters (Hong Kong University, Hong Kong, China)

Job Seekers: View current openings | Post your resume | Career resources

Employers: Post jobs | Search resumes | Employer resources

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New in GCA (v.105, 15 March 2013)
Na-bearing majoritic garnet in the Na2MgSi5O12–Mg3Al2Si3O12 join at 11–20 GPa: Phase relations, structural peculiarities and solid solutions

14C and 13C characteristics of higher plant biomarkers in Washington margin surface sediments

Thermodynamic properties of the (Ba,Pb)SO4 solid solution under ambient conditions: Implications for the behavior of Pb and Ra in the environment

In situ AFM observations of Ca–Mg carbonate crystallization catalyzed by dissolved sulfide: Implications for sedimentary dolomite formation

A unique omphacite, amphibole, and graphite-bearing clast in Queen Alexandra Range (QUE) 99177: A metamorphosed xenolith in a pristine CR3 chondrite

Insight into the silicate and organic reservoirs of the comet forming region

The clumped isotope geothermometer in soil and paleosol carbonate

Quantitative models of hydrothermal fluid–mineral reaction: The Ischia case

Intermediate sulfur oxidation state compounds in the euxinic surface sediments of the Dvurechenskii mud volcano (Black Sea)

The origins of volatiles in the terrestrial planets

Iron speciation in soft-water lakes and soils as determined by EXAFS spectroscopy and geochemical modelling

Microporosity linked fluid focusing and monazite instability in greenschist facies para-conglomerates, western India

H-chondrite parent asteroid: A multistage cooling, fragmentation and re-accretion history constrained by thermometric studies, diffusion kinetic modeling and geochronological data

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Teaching Hydrogeology, Soils, and Low-T Geochemistry in the 21st Century
National Association of Geoscience Teachers
The NSF-funded project On the Cutting Edge will offer a 4-day workshop from June 5-10, 2013, at the University of New Mexico, Albuquerque. Applicants must hold a faculty position and teach undergraduate hydrogeology, soils, biogeochemistry, low-temperature geochemistry, or upper level environmental geoscience. Some travel stipends may be available. Submitted to GNews by the National Association of Geoscience Teachers.
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Fracking wastewater can be highly radioactive
Randy Moyer said he hasn't been able to work in 14 months. He said he's seen more than 40 doctors, has 10 prescriptions to his name and no less than eight inhalers stationed around his apartment. Moyer said he began transporting brine, the wastewater from gas wells that have been hydraulically fractured, for a small hauling company in August 2011.
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Researchers find new information about 'Snowball Earth' period
It is rather difficult to imagine, but approximately 635 million years ago, ice may have covered a vast portion of our planet in an event called "Snowball Earth." According to the Snowball Earth hypothesis, the massive ice age that occurred before animal life appeared, when Earth's landmasses were most likely clustered near the equator, precipitated relatively rapid changes in atmospheric conditions and a subsequent greenhouse heat wave.
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Study: Magma once covered Mercury via NBC News
The rocky, mostly dry surface of the planet Mercury may once have been roiling with hot magma, a new study based on observations by NASA's Messenger spacecraft suggests. NASA's Messenger, the first Mercury orbiter, has made its home around the closest planet to the sun since March 2011. From its close-up perch, the probe identified two distinct types of rocks that compose the planet's surface, which scientists were at a loss to explain.
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Mineral diversity offers clue to early Earth chemistry
R&D Magazine
Mineral evolution is a new way to look at our planet's history. It's the study of the increasing diversity and characteristics of Earth's near-surface minerals, from the dozen that arrived on interstellar dust particles when the Solar System was formed to the more than 4,700 types existing today. New research on a mineral called molybdenite by a team led by Robert Hazen at Carnegie's Geophysical Laboratory provides important new insights about the changing chemistry of our planet as a result of geological and biological processes.
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Simplest water cluster leaves behind its spectral fingerprint
Water dimers have been detected in room-temperature water vapor, a key step toward understanding their effect on solar absorption and chemistry in the atmosphere. Water is the third most abundant molecule in the atmosphere and the principal absorber of both incoming sunlight and reradiated blackbody radiation. Yet models of atmospheric absorption that only take into account the water molecule's well-known rotational and vibration-rotational transitions don't match up with measurements of the atmosphere's absorption spectrum.
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Could fifth force reveal Earth's core?
Scientists have outlined a new technique that might one day reveal the composition and characteristics of the deep Earth in higher detail than ever before. There's just one catch: The technique relies on a fifth force of nature (in addition to gravity, the weak and strong nuclear forces, and electromagnetism) that has not yet been detected, but which some particle physicists think might exist.
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Missed last week's issue? See which articles your colleagues read most.

    Ice on a scorching planet (MIT Technology Review)
Remember that hole in the ozone? Well, it's shrinking (PolicyMic)
Hints of lost continent found beneath Indian Ocean (Wired)
NASA launches powerful Earth-observing satellite (Voice of America)


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