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Mars rover Curiosity sends back more postcards from Red Planet
Reuters    Share    Share on FacebookTwitterShare on LinkedinE-mail article
The science rover Curiosity took a break from instrument checks on its third full day on Mars to beam back more pictures from the Red Planet, including its first self-portrait and a 360-degree color view of its home in Gale Crater, NASA said. 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.92, 1 September 2012)
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Extended chronologies of aqueous alteration in the CM2 carbonaceous chondrites: Evidence from carbonates in Queen Alexandra Range 93005

Isotopic fractionation during congruent dissolution, precipitation and at equilibrium: Evidence from Mg isotopes

The silicon isotope composition of granites

Adsorption of Cu(II) to ferrihydrite and ferrihydrite–bacteria composites: Importance of the carboxyl group for Cu mobility in natural environments

Crystallisation of strontium sulphates from Si-bearing aqueous solutions

Atomic scale structures of interfaces between kaolinite edges and water

Reduced isotope fractionation by denitrification under conditions relevant to the ocean

Comment on "Fertilization and pH effects on processes and mechanisms controlling dissolved inorganic phosphorus in soils" by Nicolas Devau et al. (2011)

Molecular interactions of SO2 with carbonate minerals under co-sequestration conditions: A combined experimental and theoretical study

Properties of impurity-bearing ferrihydrite I. Effects of Al content and precipitation rate on the structure of 2-line ferrihydrite

An XAS study of molybdenum speciation in hydrothermal chloride solutions from 25–385 °C and 600 bar

Combined 238U–230Th and 235U–231Pa constraints on the transport of slab-derived material beneath the Mariana Islands

Petrogenesis of the Northwest Africa 4734 basaltic lunar meteorite

 Latest News

Largest US coal ash pond to close, but future rules still undecided
National Geographic    Share    Share on FacebookTwitterShare on LinkedinE-mail article
Neighbors recall promises that the eerie azure lake known as "Little Blue" would be made into a recreational jewel, complete with swimming, bike trails, and sailboats. But the sprawling pond, its blue somewhat faded in recent years, delivered more blight than benefits to its rural surroundings near the West Virginia border in southwestern Pennsylvania. Pennsylvania officials now have initiated shutdown of the facility south of the Ohio River, one of the largest U.S. impoundments for waste ash from coal power plants. More

Impact on shellfish from ocean acidification
RedOrbit    Share    Share on FacebookTwitterShare on LinkedinE-mail article
In the journal Global Change Biology, a worldwide study is published to understand and forecast the likely impact of ocean acidification on shellfish and other marine life living in seas from the tropics to the north and south poles. Ocean acidification is occurring because some of the increased carbon dioxide humans are adding to the atmosphere dissolves in the ocean and reacts with water to produce an acid. More

Global groundwater use outpaces supply
ScienceNews    Share    Share on FacebookTwitterShare on LinkedinE-mail article
A handful of thirsty countries are guzzling their groundwater reserves much faster than those resources can be renewed. India, Pakistan, Saudi Arabia, Iran, Mexico and the United States lead the global pack of water-thirsty nations, researchers report online August 8 in Nature. More

Geochemistry of deep sea sediments at cold seep sites in the Nankai Trough: Insights into the effect of anaerobic oxidation of methane
Marine Geology (subscription required)    Share    Share on FacebookTwitterShare on LinkedinE-mail article
Two types of sediment were recovered from "methane seep" sites in the Nankai Trough: "Cold seep" sediment affected by anaerobic oxidation of methane (AOM), and unaffected "Typical oxic marine sediment", Concentrations of carbon, sulfur, iron, and trace metals were analyzed in these sediments. The results showed that the sulfur contents of "cold seep" sediments are higher than those of typcial oxic marine sediments, although the organic carbon contents of the two types of sediment are identical. More

Ice sheets in transition
Science (subscription required)    Share    Share on FacebookTwitterShare on LinkedinE-mail article
It is now well known that periodic variations in ice-age climate correspond to variations in Earth's orbit around the Sun. However, some notable aspects of this climate variability appear to have little or no relation to orbital forcing. One such example is the middle Pleistocene transition (MPT), which began at some time after 1.25 million years ago. More

Groundwater arsenic concentrations in Vietnam controlled by sediment age
Nature Geoscience (subscription required)    Share    Share on FacebookTwitterShare on LinkedinE-mail article
Arsenic contamination of groundwater continues to threaten the health of millions of people in southeast Asia. The oxidation of organic carbon, coupled to the reductive dissolution of arsenic-bearing iron oxides, is thought to control the release of sediment-bound arsenic into groundwater. More

Climate change is bad news for Baltic Sea
Environmental Research Web    Share    Share on FacebookTwitterShare on LinkedinE-mail article
Researchers near to the Baltic Sea have teamed up to model what climate change and other environmental problems have in store for the region's ecosystems. Their findings? At the end of the century water temperature could be higher and salinity and oxygen concentrations lower than at any time since 1850. More


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