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Discovery has implications for finding life on
Earth, Mars

R&D Magazine    Share    Share on FacebookTwitterShare on LinkedinE-mail article
Moqui marbles, unusual balls of rock that can be found rolling around the southwestern U.S. sandstone regions, were formed roughly two million years ago with the help of microorganisms. This discovery by a University of Nebraska-Lincoln research team has implications for finding life on Mars and for better understanding Earth's past. More

 Society News

Recent Geochemical Career Center postings
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Post Doc Appointee – Geochemistry (Sandia National Lab, Albuquerque, NM, USA)

Environmental Earth Sciences Faculty Position (University of Notre Dame, South Bend, IN, USA)

Assistant Professor in Aqueous Geochemistry/ Biogeochemistry (University of South Carolina, Columbia, SC, USA)

Assistant Professor in Sedimentary Systems Geology (University of South Carolina, Columbia, SC, USA)

Analytical Fluid Geochemist (GNS Science, Lower Hutt, New Zealand)

Harry S. Truman Fellowship In National Security Science and Engineering (Sandia National Lab, Albuquerque, NM, USA)

Assistant/Associate Professor in Global Change Oceanography (University of South Carolina, Columbia, SC, USA)

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New in GCA (v.93, 15 September 2012)
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Competitive adsorption of arsenate and phosphate onto calcite; experimental results and modeling with CCM and CD-MUSIC

The flux of iron and iron isotopes from San Pedro Basin sediments

Post-adsorption process of Yb phosphate nano-particle formation by Saccharomyces cerevisiae

Characterization of Ni-rich hexagonal birnessite and its geochemical effects on aqueous Pb2+/Zn2+ and As(III)

Platinum group element abundances in the upper continental crust revisited – New constraints from analyses of Chinese loess

Circumstellar and interstellar material in the CO3 chondrite ALHA77307: An isotopic and elemental investigation

Geochemistry of the Phlegraean Fields (Italy) proximal sources for major Mediterranean tephras: Implications for the dispersal of Plinian and co-ignimbritic components of explosive eruptions

Retention of inherited Ar by alkali feldspar xenocrysts in a magma: Kinetic constraints from Ba zoning profiles

Empirical calibration of shell chemistry of Cyprideis torosa (Jones, 1850) (Crustacea: Ostracoda)

Experimental evidence for the absence of iron isotope fractionation between metal and silicate liquids at 1 GPa and 1250–1300 °C and its cosmochemical consequences

Ionization constants and thermal stabilities of uracil and adenine under hydrothermal conditions as measured by in situ UV–visible spectroscopy

Isotope fractionation by diffusion in silicate melts: Insights from molecular dynamics simulations

Major elements and Mg# of the Moon: Results from Chang'E-1 Interference Imaging Spectrometer (IIM) data

 Latest News

NASA decision time: more Mars or go beyond?
CBC News    Share    Share on FacebookTwitterShare on LinkedinE-mail article
NASA is expecting to make two large funding commitments, which may include another surface mission to Mars to build upon what the rover Curiosity has begun. One of these commitments will deal with the American space agency's strategic direction for Mars. More

Ash generation and distribution from the April-May 2010 eruption of Eyjafjallajokull, Iceland
Nature    Share    Share on FacebookTwitterShare on LinkedinE-mail article
When signs of unrest were detected in 1992, the volcano of Eyjafjallajokull had been quiet since the eruption of 1821-23. The pre-2010 unrest was signified by discrete periods of seismic swarms and uplift and culminated in two eruptions in 2010. More

Years after slash and burn, Brazil haunted by 'black carbon'
ScienceNOW    Share    Share on FacebookTwitterShare on LinkedinE-mail article
Although nearly 40 years have passed since Brazil banned slash-and-burn practices in its Atlantic Forest, the destruction lingers. New research reveals that charred plant material is leaching out of the soil and into rivers, eventually making its way to the ocean. So much of this "black carbon" is entering the marine ecosystem that it could be hurting ocean life, although further tests will be needed to confirm this possibility. More

Hydrogen sulphide poisoning of shallow seas following the end-Triassic extinction
Nature Geoscience (subscription required)    Share    Share on FacebookTwitterShare on LinkedinE-mail article
The evolution of complex life over the past 600 million years was disrupted by at least five mass extinctions, one of which occurred at the close of the Triassic period. The end-Triassic extinction corresponds to a period of high atmospheric-CO2 concentrations caused by massive volcanism and biomass burning; most extinction scenarios invoke the resulting environmental perturbations in accounting for the loss of marine and terrestrial biodiversity. More


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