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Volcanic arcs fed by rapid pulsed fluid flow through subducting slabs
Nature Geoscience (paid subscription required)    Share    Share on FacebookTwitterShare on LinkedinE-mail article
At subduction zones, oceanic lithosphere that has interacted with sea water is returned to the mantle, heats up during descent and releases fluids by devolatilization of hydrous minerals. Models for the formation of magmas feeding volcanoes above subduction zones require large scale transport of these fluids into overlying mantle wedges. More

 Society News


Goldschmidt 2012: Wednesday's Plenary and V.M. Goldschmidt Award
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PLENARY. Wednesday's Goldschmidt 2012 plenary is the Shale Gas Forum. Dr. Robert Howarth (Cornell University) will present "Greenhouse gas footprint of shale gas obtained by hydraulic fracturing" which will be followed by Dr. Terry Engelder (Pennsylvania State University) who will present "The Eh and pH of Fracking".

GOLDSCHMIDT. Dr. Edward M. Stolper (Caltech) shall be awarded the 2012 V.M. Goldschmidt Medal on Wednesday at 16:45 before his talk "Ni partitioning between olivine and high-MgO silicate melts: Implications for Ni contents of forsteritic phenocrysts in basalts". Dr. Stolper's citationist is Dr. John Eiler (Caltech).



Goldschmidt 2012: Online registration closes on June 11

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The last day to register online for the Goldschmidt conference is June 11. On-site registration will open on Sunday, June 24, in Viger Hall at the Palais de congres de Montreal.

New in GCA (v87, 15 June 2012)
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Volcanic emissions of molecular chlorine

New constraints on the genesis and long-term stability of Os-rich alloys in the Earth's mantle

The influence of source heterogeneity on the U–Th–Pa–Ra disequilibria in post-glacial tholeiites from Iceland

Biogeochemical characterization of a lithified paleosol: Implications for the interpretation of ancient Critical Zones

Speciation and transformation of phosphorus and its mixing behavior in the Bay of St. Louis estuary in the northern Gulf of Mexico

Comparison of GC–MS, GC–MRM-MS, and GC × GC to characterise higher plant biomarkers in Tertiary oils and rock extracts

Sulfur-33 constraints on the origin of secondary pyrite in altered oceanic basement

Effects of biogeochemical processes on magnesium isotope variations in a forested catchment in the Vosges Mountains (France)

Comment on "New data on equilibrium iron isotope fractionation among sulfides: Constraints on mechanisms of sulfide formation in hydrothermal and igneous systems" by V.B. Polyakov and D.M. Soultanov

Response to the comment by M. Blanchard, F. Poitrasson, M. Meheut, M. Lazzeri, F. Mauri, E. Balan on "New data on equilibrium iron isotope fractionation among sulfides: Constraints on mechanisms of sulfide formation in hydrothermal and igneous systems" published in Geochim. Cosmochim. Acta 75 (2011) 1957–1974

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 Latest News


Hafnium isotope evidence for a transition in the dynamics of continental growth 3.2-Gyr ago
Nature (paid subscription required)    Share    Share on FacebookTwitterShare on LinkedinE-mail article
Earth's lithosphere probably experienced an evolution towards the modern plate tectonic regime, owing to secular changes in mantle temperature. Radiogenic isotope variations are interpreted as evidence for the declining rates of continental crustal growth over time, with some estimates suggesting that over 70 percent of the present continental crustal reservoir was extracted by the end of the Archaean eon. More

Fukushima radiation seen in tuna off California
Reuters    Share    Share on FacebookTwitterShare on LinkedinE-mail article
Low levels of nuclear radiation from the tsunami-damaged Fukushima power plant have turned up in bluefin tuna off the California coast, suggesting that these fish carried radioactive compounds across the Pacific Ocean faster than wind or water can. More

Supervolcanoes evolve superquickly
ScienceNews    Share    Share on FacebookTwitterShare on LinkedinE-mail article
The biggest eruptions on Earth may happen faster than volcanologists had thought. Giant blobs of magma appear underground and then pour onto the surface within centuries, suggests a new study of a California supereruption. More

Changes in Gulf of Maine ecosystem linked to excessive rainfall, change in climate
The Free Press    Share    Share on FacebookTwitterShare on LinkedinE-mail article
With half of Maine's largest rainfall events of the last century occurring in the past seven years, researchers have documented evidence of significant changes in the Gulf of Maine ecosystem directly tied to increased amounts of rainfall and volumes of river discharge. More

Forex manna from heaven: Space mining and the peak metals crunch
Forbes    Share    Share on FacebookTwitterShare on LinkedinE-mail article
With the successful docking of SpaceX's Dragon spacecraft at the International Space Station (ISS) as well as Planetary Resources, Inc.'s recent announcement that it would be reconnoitering and eventually mining Near-Earth Asteroids (NEA)s, Forbes.com thought it might make sense to do an Earth-based reality check. More


 
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