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Unique meteorite helps researchers uncover the climate history of Mars
redOrbit.com
A meteorite discovered in the Sahara Desert three years ago could hold the secrets to the climate history of Mars, and may ultimately help answer the question as to whether or not the now cold, dry Red Planet was once home to a warm environment capable of supporting life, an international team of researchers claim in a new study.
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SOCIETY NEWS


Geochemical Career Center
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New! Postdoctoral Research Associate – Geochemistry (Oak Ridge National Laboratory, Oak Ridge, TN, USA)




Postdoctoral Researcher in Microbial Geochemistry (Duke University, Durham, NC, USA)




Postdoctoral Fellowship Positions in Geochemistry, Cosmochemistry, and Astrobiology (Carnegie Institution, Washington, DC, USA)




Professor (W3) for Petrology (Karlsruhe Institute of Technology, Karlsruhe, Germany)




Associate Environmental Geoscientist (Illinois State Geological Survey, Champaign, IL, USA)




Senior Staff Associate (Lamont-Doherty Earth Observatory of Columbia University of Columbia University, Palisades, NY, USA)




Lectureship in Earth Sciences (University of St. Andrews, St. Andrews, UK)




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New in GCA (v.140, 1 September 2014)
GS
[open access] Influence of nitrogen substrates and substrate C:N ratios on the nitrogen isotopic composition of amino acids from the marine bacterium Vibrio harveyi

Determination of δ11B by HR-ICP-MS from mass limited samples: Application to natural carbonates and water samples

Density functional theory estimation of isotope fractionation of Fe, Ni, Cu, and Zn among species relevant to geochemical and biological environments

The Mg isotope composition of presolar silicate grains from red giant stars

Hydroxyl speciation in felsic magmas

The retention of uranium and europium onto sepiolite investigated by macroscopic, spectroscopic and modeling techniques

The coupled geochemistry of Au and As in pyrite from hydrothermal ore deposits

Light is an active contributor to the vital effects of coral skeleton proxies

A new Mg-in-plagioclase geospeedometer for the determination of cooling rates of mafic rocks

Total X-ray scattering, EXAFS, and Mössbauer spectroscopy analyses of amorphous ferric arsenate and amorphous ferric phosphate

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New in G-Cubed (v.15, issue 6)
GS
Trace element mass balance in hydrous adiabatic mantle melting: The Hydrous Adiabatic Mantle Melting Simulator version 1 (HAMMS1)

Simultaneous in situ determination of U-Pb and Sm-Nd isotopes in monazite by laser ablation ICP-MS

Constraining mid to late Holocene relative sea level change in the southern equatorial Pacific Ocean relative to the Society Islands, French Polynesia

High-resolution 40Ar/39Ar dating using a mechanical sample transfer system combined with a high-temperature cell for step heating experiments and a multicollector ARGUS noble gas mass spectrometer

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GEOCHEMISTRY IN THE NEWS


Nitrogen-transforming bacteria: Now powered by hydrogen
Science 2.0
Nitrite-oxidizing bacteria are key players in the natural nitrogen cycle on Earth and in biological wastewater treatment plants but scientists have learned something new about how they are powered. For decades, these specialist bacteria were thought to depend on nitrite as their source of energy researchers have now shown that nitrite-oxidizing bacteria can use hydrogen as an alternative source of energy. The oxidation of hydrogen with oxygen enables their growth independent of nitrite and a lifestyle outside the nitrogen cycle.
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19,000 years ago, Arctic sea ice influenced force of the Gulf Stream
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research via Science 2.0
Researchers have succeeded in reconstructing the sea ice conditions in the Fram Strait for this critical period at the end of the last glacial and thus in finding a direct connection between changes in sea ice cover and fluctuations in the Gulf Stream. A 9-meter-long sediment core served as a window into the past for the geologists. It was drilled on a Fram Strait expedition conducted on the research vessel Maria. S. Merian and has such clearly defined layers that the scientists can read it like a book.
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TRENDING ARTICLES
Missed last week's issue? See which articles your colleagues read most.

    Burrowing animals may have been key to stabilizing Earth's oxygen (University of Southern Denmark)
Humans have tripled mercury levels in the ocean (Nature)

Don't be left behind. Click here to see what else you missed.


 

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