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New study finds oceans arrived early to Earth
Woods Hole Oceanographic Institute
Earth is known as the Blue Planet because of its oceans, which cover more than 70 percent of the planet's surface and are home to the world's greatest diversity of life. While water is essential for life on the planet, the answers to two key questions have eluded us: where did Earth's water come from and when?
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SOCIETY NEWS


Geochemical Career Center
GS


Faculty Position in Environmental Chemistry and Engineering (Pontificia Universidad Coatolica de Chile, Santiago, Chile)




Associate Research Scientist (Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA)




Post Doctoral Appointee (Indiana University, Bloomington, IN, USA)




Assistant Professor in Water Science, The University of Texas at Austin (Austin, TX, USA)




Postdoctoral Research Assistant in Geochemistry (University of Oxford, Oxford, United Kingdom)




Postdoctoral Research Associate in Aquatic Biogeochemistry (University of Florida, Gainesville, FL, USA)




Postdoctoral Appointee (Argonne National Laboratory, Lemont, IL, USA)




Tenure-Track Assistant Professor of Hydrogeology (Georgia State University, Atlanta, GA, USA)




Faculty Positions in Geophysical Sciences (University of Chicago, Chicago, IL, USA)




Hamilton Professor of Earth Sciences (Southern Methodist University, Dallas, TX, USA)




Assistant Professor SIMS (The University of Western Australia, Crawley, Australia)




Senior Research Officer SIMS (The University of Western Australia, Crawley, Australia)




Assistant Professor/Associate Professor/Professor SIMS (The University of Western Australia, Crawley, Australia)




Postdoctoral Research Associate (Gemological Institute of America, Carlsbad, CA USA)




CPS Postdoctoral Fellowships in Planetary/ Exoplanet Science (University of Toronto, Toronto, Canada)




Final Days! Research Associate (Macquarie University, Sydney, Australia)


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New in GCA (v.143, 15 OCTOBER 2014)
GS
Common Pb isotope mapping of UHP metamorphic zones in Dabie orogen, Central China: Implication for Pb isotopic structure of subducted continental crust

First-principles investigations of equilibrium calcium isotope fractionation between clinopyroxene and Ca-doped orthopyroxene

Geochemistry of primary-carbonate bearing K-rich igneous rocks in the Awulale Mountains, western Tianshan: Implications for carbon-recycling in subduction zone

Behaviour of geophysical subducted water and its role in magma genesis in the NE Japan arc: A combined and geochemical approach

Origin of carbonatites in the South Qinling orogen: Implications for crustal recycling and timing of collision between the South and North China Blocks

Postcollisional potassic and ultrapotassic rocks in southern Tibet: Mantle and crustal origins in response to India–Asia collision and convergence

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GEOCHEMISTRY IN THE NEWS


Low oxygen level prolonged evolution of animals on Earth
Tech Times
While genetic and ecological innovation are attributed with the rise of animals, there is also evidence that animal life would not have flourished if a sufficient level of oxygen had not been present. Animals first appeared around 600 to 700 million years ago. Scientists learned that for those billions of years before this period, the oxygen levels measured at only 0.1 percent of today's level.
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Is there a new threat to the ozone layer?
Reflexions
After the alarm was raised in the 1980s, the ozone layer, which up to then had been destroyed by industrial activity, began to improve slightly. However, on the initiative of Emmanuel Mahieu, a researcher at the University of Liege, an international team observed that between 2007 and 2011, the trend of chlorine – the main destructive element affecting the ozone layer – had reversed, showing an increase in the Northern Hemisphere.
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Increase in ozone-destroying substances, but Montreal Protocol on track
University of Leeds via ScienceDaily
Scientists have shown a recent increase in atmospheric hydrogen chloride, a substance linked to destruction of the ozone layer.
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TRENDING ARTICLES
Missed last week's issue? See which articles your colleagues read most.

    BP spill left big oily 'bathtub ring' on seafloor (Sci-Tech Today)
Low oxygen 'delayed animal life on Earth' (BBC)
Goldschmidt2015: Call for Sessions (GS)

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