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Earth's mantle plasticity explained: Missing mechanism for deforming olivine-rich rocks
The Earth's mantle is a solid layer that undergoes slow, continuous convective motion. But how do these rocks deform, thus making such motion possible, given that minerals such as olivine (the main constituent of the upper mantle) do not exhibit enough defects in their crystal lattice to explain the deformations observed in nature? Scientists have provided an unexpected answer to this question. It involves little known and hitherto neglected crystal defects, known as 'disclinations', which are located at the boundaries between the mineral grains that make up rocks.
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Goldschmidt2014: Plenaries
A number of exciting plenaries are planned for Goldschmidt2014. Hope Jahren (University of Hawai'i at Manoa) will speak on "What can the Carbon Isotope Composition of Plant Tissue Tell us?" Christopher Kim (Chapman University) and Andrea Foster (USGS) will have a joint presentation on "The Environmental Legacy of California's Gold Rush: Arsenic and Mercury Contamination from Historic Mining." And 2014 Gast Lecturer Tim Elliot (University of Bristol) will explain "The Implications of a Non-Chondritic Terrestrial Mg Isotope Composition". Additional plenaries will be presented by Pan Conrad (NASA, Goddard Space Flight Center) "Measuring the Habitability Potential of Mars: An Evolving State of the art", and by EAG President Christopher Ballentine (University of Oxford).
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Correction: New study supports ancient age for Hadean Zircon from Australia
The lead story in last week's Geochemical News contained an inaccurate headline and short summary. As reported in the text of the story published in Sky and Telescope, the article published in Nature Geoscience by John Valley and coworkers reports refined U-Pb analysis of a zircon from Jack Hills Australia with an age of 4374 ± 6 Ma that provides strong support that this age reflects the igneous crystallization age for this zircon. The age adds to growing evidence for the presence of terrestrial crust formed within 200 Ma of the beginning of Solar system formation. We apologize that Geochemical News repeated the inaccurate headline supplied by Sky and Telescope for this most interesting result. For more information click here.
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Geochemical Career Center

Extended! Director, Romberg Tiburon Center for Environmental Studies (San Francisco State University, San Francisco, CA, USA)

2 Postdoctoral positions and 3 doctoral positions (University of Münster, Münster, Germany)

Tenure-track faculty position in radiogenic isotope geochemistry (Pennsylvania State University, University Park, PA, USA)

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New in GCA (v.127, 15 February 2014)
Distribution of trace element in Japanese red coral Paracorallium japonicum by μ-XRF and sulfur speciation by XANES: Linkage between trace element distribution and growth ring formation

Hafnium–neodymium isotope systematics of the 2.7 Ga Gadwal greenstone terrane, Eastern Dharwar craton, India: Implications for the evolution of the Archean depleted mantle

Contrasting styles of water–rock interaction at the Mars Exploration Rover landing sites

High temperature (>350 °C) thermochronology and mechanisms of Pb loss in apatite

Diffusive fractionation of carbon isotopes in γ-Fe: Experiment, models and implications for early solar system processes

Zn isotope compositions of the thermal spring waters of La Soufrière volcano, Guadeloupe Island

A Bayesian, spatially-varying calibration model for the TEX86 proxy

Synthesis, characterization and thermochemistry of synthetic Pb–As, Pb–Cu and Pb–Zn jarosites

Quantitative X-ray photoelectron spectroscopy-based depth profiling of bioleached arsenopyrite surface by Acidithiobacillus ferrooxidans

Melt generation beneath Arctic Ridges: Implications from U decay series disequilibria in the Mohns, Knipovich, and Gakkel Ridges

South Pacific dissolved Nd isotope compositions and rare earth element distributions: Water mass mixing versus biogeochemical cycling

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How river networks move across a landscape
Large river networks — such as those that funnel into the Colorado and Mississippi rivers — may seem to be permanent features of a landscape. In fact, many rivers define political boundaries that have been in place for centuries. Now researchers have developed a mapping technique that measures how much a river network is changing, and in what direction it may be moving.
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Costa Rican volcano spews material 300 meters high after explosion inside crater
The Tico Times
The crater of Costa Rica's Poas Volcano expelled material 300 meters into the air at noon on Feb. 25. The phenomenon, called a phreatic explosion, occurred due to a reaction between magma and water at the southern border of the lake inside the volcano. However, this was not an eruption and the volcano did not spew lava. Instead, a column of steam, gas and other materials formed and spouted out the top of the volcano, confirmed the Volcanological and Seismological Observatory of Costa Rica.
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Decades of rising seas predicted as huge Antarctic glacier melts
Digital Journal
Pine Island Glacier, part of the West Antarctic Ice Sheet and the biggest single contributor to rises in global sea levels, continues to melt at record rates. The melt could continue for decades, according to new research. Not only is the Pine Island Glacier retreating, it's doing so at an accelerating rate. That's one of the findings of a team of geologists from the U.K., U.S. and Germany. They found that this isn’t the first time the Pine Island Glacier has experienced such rapid contraction.
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Fall AGU call for sessions
Session proposals for the 2014 Fall AGU Meeting are being accepted through April 16. If you are considering submitting a session, please note that the session proposal submission process has changed. For more information on this new process please see the AGU tutorial.
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EGU General Assembly 2014
The EGU General Assembly 2014 will bring together geoscientists from all over the world to one meeting covering all disciplines of the Earth, planetary and space sciences. The EGU aims to provide a forum where scientists, especially early career researchers, can present their work and discuss their ideas with experts in all fields of geosciences. The meeting will be held in Vienna, Austria April 27 to May 2. The early registration deadline is March 31.
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8th International Mars Conference call for abstracts
The Eighth International Mars Conference will be held July 14–18, at the California Institute of Technology (Caltech) in Pasadena, Calif. The focus of the conference will be on integrating our new multi-disciplinary understandings of Mars, and identifying the large-picture scientific questions that have been (or will be) addressed by missions that are either ongoing or are in development. Contributions from all sub-disciplines of Mars science are encouraged. The abstract submission deadline is April 24.
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Missed last week's issue? See which articles your colleagues read most.

    Volcanoes contribute to recent warming 'hiatus' (Geology Times)
NASA scientists find evidence of water in meteorite, reviving debate over life on Mars (ScienceDaily)

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