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Newly discovered ocean plume could be major source of iron
Scientists have discovered a vast plume of iron and other micronutrients more than 1,000 km long billowing from hydrothermal vents in the South Atlantic Ocean. The finding, published online in the journal Nature Geoscience, calls past estimates of iron abundances into question, and may challenge researchers' assumptions about iron sources in the world's seas.
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This week, we join around 4,000 delegates in Florence, Italy for Goldschmidt2013. Please visit the website for more information and updates, including the daily newsletter. If you are fortunate to be at the conference Friday afternoon, be sure to join us at the EAG and GS exhibit booths (#22 and #19 respectively) for a special wine competition event to pass the torch from Florence to the Goldschmidt 2014 in California. Come sample and vote, and while you are there check out what we have planned for next year.
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Lange named 2013 F. Earl Ingerson Lecturer
Rebecca Lange (University of Michigan) has been selected as the 2013 F. Earl Ingerson Lecturer. Her talk, The origin of highly evolved, voluminous rhyolites by progressive, multiple episodes of partial melting: The resolution of some paradoxes, will be presented at the GSA Annual Meeting this October.
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ELEMENTS: Continental Crust at Mantle Depths
The August issue of Elements magazine (volume 9, issue 4) is in press. The story told in this issue developed from a simple observation under the microscope and the curiosity of a scientist to identify the "weird inclusions" he was looking at. The identification of these inclusions changed the way we thought the continental crust was behaving. Indeed the discovery of coesite (a high-pressure polymorph of SiO2) in crustal rocks is compelling evidence that continental material has experienced pressures that can only be achieved at mantle depths. At least 20 terranes of unequivocal continental crust containing diamond or coesite are now recognized around the globe; their study constitutes a new field in petrology called ultrahigh-pressure metamorphism.

Current Geochemical Society members can access this issue now via the Elements online archive using your email address (UserID) and member number (Password).

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  Mantle Xenolith Data in PetDB

PetDB includes analytical data for more than 8,000 deep crustal and mantle xenolith samples (formerly Deep Lithosphere Dataset), including major and trace element chemistry, isotopic compositions, mineral chemistry, modal abundances, thermobarometry, and compositional data of fluid and melt inclusions. Search for Sample Type: Xenolith in PetDB!

Geochemical Career Center

New! Postdoctoral and/or PhD position(s) for Re-Os geochemistry of shale's and hydrocarbons (Colorado State University, Fort Collins, CO, USA)

Tenure-Track Position in Organic Geochemistry (University of Colorado, Boulder, CO, USA)

Postdoctoral Researcher, Mantle Processes Group (Stanford University, Stanford, CA, USA)

Geochemistry and Habitability of Ancient Waters: Postdoctoral Position Available (University of Toronto, Toronto, ON, Canada)

Associate Isotope Geochemist or Isotop Geochemist (depending on qualifications) (Illinois State Geological Survey, Urbana-Champaign, IL, USA)

Research Lab Specialist (electron microscopy, Auger nanoscope, XRD) (University of Michigan, Ann Arbor, MI, USA)

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

Tenure Track Position in Stable Isotope Geochemistry (Temple University, Philadelphia, PA, USA)

Final Days! Microprobe Lab Manager (Ruhr Universitaet Bochum, Bochum, Germany)

Job Seekers: View current openings | Post your resume | Career resources

Employers: All jobs posted in the Geochemical Career Center are cross-promoted through Facebook, Twitter and right here in Geochemical News.

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New in GCA (v.117, 15 September 2013)
Dynamic Fe-precipitate formation induced by Fe(II) oxidation in aerated phosphate-containing water

Oxygen isotope fractionation between aragonite and seawater: Developing a novel kinetic oxygen isotope fractionation model

Towards an understanding of thallium isotope fractionation during adsorption to manganese oxides

Abiotic U(VI) reduction by sorbed Fe(II) on natural sediments

40Ar/39Ar and (U–Th)/He – 4He/3He geochronology of landscape evolution and channel iron deposit genesis at Lynn Peak, Western Australia

Multiple sources of selenium in ancient seafloor hydrothermal systems: Compositional and Se, S, and Pb isotopic evidence from volcanic-hosted and volcanic-sediment-hosted massive sulfide deposits of the Finlayson Lake District, Yukon, Canada

Weathering model for the quantification of atmospheric oxygen evolution during the Paleoproterozoic

The speciation and transport of palladium in hydrothermal fluids: Experimental modeling and thermodynamic constraints

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New in G-Cubed
The petrogenesis of plagioclase-phyric basalts at mid-ocean ridges

New packer experiments and borehole logs in upper oceanic crust: Evidence for ridge-parallel consistency in crustal hydrogeological properties

Influence of the inter tropical discontinuity on Harmattan dust deposition in Ghana

Pre-eruptive flow focusing in dikes feeding historical pillow ridges on the Juan de Fuca and Gorda Ridges

Surficial permeability of the axial valley seafloor; endeavour segment, Juan de Fuca Ridge

Trace metal and carbon isotopic variations in cave dripwater and stalagmite geochemistry from Northern Borneo

Oxygen isotopes in subducted oceanic crust: A new perspective from siberian diamondiferous eclogites

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Geological feature on Mercury named for Antarctic research vessel
National Science Foundation
The R/V Nathaniel B. Palmer, an ice-capable Antarctic research vessel chartered for the National Science Foundation (NSF), has routinely braved some of the world's most hostile waters in support of the science carried out by the United States Antarctic Program. Now, a geological feature on one of the inhospitable planets in the solar system bears the ship's name.
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Transboundary aquifers feel the strain
Environmental Research Web
Internationally shared aquifers are under increasing pressure, according to the first worldwide view of groundwater stress on the resources. Thirty-one transboundary aquifers are currently stressed due to human overexploitation. Meanwhile, stress on other aquifers has been increasing "at an alarming rate" for the past 50 years due to groundwater abstraction for food production.
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Molten magma can survive in upper crust for hundreds of millennia
Reservoirs of silica-rich magma — the kind that causes the most explosive volcanic eruptions — can persist in Earth's upper crust for hundreds of thousands of years without triggering an eruption, according to new University of Washington modeling research.
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Missed last week's issue? See which articles your colleagues read most.

    New NASA mission to help us learn how to mine asteroids (Space Daily)
Earth's 100,000-year Ice Age cycle decoded (PTI via Money Control)
The daily grind: Princeton lab uncovers the planetary past hidden in rocks (Princeton University)

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


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