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Earth's crust was unstable in Archean Eon; dripped down into mantle
Earth's mantle temperatures during the Archean eon, which commenced some 4 billion years ago, were significantly higher than they are today. According to recent model calculations, the Archean crust that formed under these conditions was so dense that large portions of it were recycled back into the mantle. This is the conclusion reached by Dr. Tim Johnson who is currently studying the evolution of Earth's crust as a member of the research team led by Professor Richard White of the Institute of Geosciences at Johannes Gutenberg University Mainz (JGU).
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Goldschmidt2014: Feb. 8 abstract deadline
Abstracts and registration are now open for the Goldschmidt2014 conference! This year, delegates have the option of submitting two abstracts as a presenting author. Be sure to see our list of sessions as well as abstract submission information for submission procedures. Abstract submission closes at 23:59 EST on Feb. 8, 2014. The Convention Center in Sacramento is a great venue for a conference and we look forward to you joining us there June 8-13!
GS welcomes new officers and volunteers
Starting on Jan. 1, 2014, Barbara Sherwood Lollar (University of Toronto) has taken up the mantle as Geochemcial Society President, serving after Richard Carlson (Carnegie Institution of Washington) who will remain on the Board as Past-President. Joining the 2014 Board of Directors are six new members: Vice-President Laurie Reisberg (CRPG), Secretary Anton Eisenhauer (GEOMAR), OGD Chair Katherine Freeman (Penn State University), OGD Secretary Hilairy Hartnett (Arizona State University), Director Tomoki Nakamura (Tohoku University), and Chris Hawkesworth (University of St. Andrews).
Five other committees also welcome new members. Jeremy Fein (University of Notre Dame) and Andrew Davis (University of Chicago) join the 2014 Joint Publications Committee; Erik Hauri (Carnegie Institution of Washington) and Takeshi Kakegawa (Tohoku Univeristy) join the 2014 Nominations Committee; Elisabeth Sikes (Rutgers University), Hilairy Harnett (Arizona State University) and Josef Werne (University of Pittsburg) join the 2014 OGD Executive Committee; Pratigya Polissar (Columbia University) joins the 2014 OGD Best Paper Award Committee and James Brenan (University of Toronto) and Li-Hung Lin (National Taiwan University) join the 2014 Geochemical News Editors.
Thank you for your service in 2013!
We also want to take this moment to thank the members of the geochemical community who have completed their volunteer service as of Dec. 31, 2013. Sam Mukasa (University of New Hampshire) completes a six-year presidential cycle on the Board. Also completing Board terms are Secretary Edwin Schauble (University of California), OGD Chair Stuart Wakeham (Skidaway Institute of Oceanography), OGD Secretary Gesine Mollenhauer (Alfred-Wegener-Institute), Director Catherine Chauvel (University of Grenoble) and Director Derek Vance (ETH Zürich).
Completing committee assignments are: Munir Humayun (Florida State University), Miryam Bar-Matthews (Geological Survey of Israel), and Jeffrey Grossman (NASA) for the Joint Publications Committee; Karen Hudson-Edwards (University of London), Takeshi Kakegawa (Tohoku University) for the Nominations Committee; Elizabeth Canuel (Virginia Institute of Marine Science), Gesine Mollenhauer (Alfred-Wegener-Institute), and Silvio Pantoja (Universidad de Concepcion) for the OGD Executive Committee; Carol Arnosti for the OGD Best Paper Award Committee; and Shuhei Ono (MIT) and Martin Elsner (Helmholtz Zentrum München) as editors of Geochemical News.
RIMG v.77 - Geochemistry of Geologic CO2 Sequestration
The newest RIMG volume, Geochemistry of Geologic CO2 Sequestration, is now available for purchase. From the series editor: "The IPCC's (Intergovernmental Panel on Climate Change) Fifth Assessment Report (AR5) released Sept. 25, 2013 stated that humans are the 'dominate cause' of global warming and warned that continued emissions of greenhouse gases will cause further warming and changes in all aspects of the climate system. Increasing atmospheric CO2 concentrations, in particular, are considered to be the largest contributor to the climate changes and warming trends observed. According to the IPCC, it is essential to curb the production and release of CO2 and other greenhouse gases. How perfectly timed that this latest volume in the Reviews in Mineralogy and Geochemistry series is focused on geologic carbon sequestration, a method to contain CO2 in the subsurface! Co-edited by Don DePaolo, Dave Cole, Alex Navrotsky, and Ian Bourg, this volume presents an extended review of the topics covered in a short course on Geochemistry of Geologic CO2 Sequestration held at the Lawrence Berkeley National Laboratory (LBNL) in Berkeley, CA prior (Dec. 7–8, 2013) to the American Geophysical Union's 46th Annual Fall meeting in San Francisco, CA.”
GS Members receive a 25 percent discount for this and all RIMG titles.
Geochemical Career Center
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Executive Editor for Elements Magazine (Mineralogical Society of America, Chantilly, VA, USA)
Assistant/Associate Professor in Geochemistry (Laurentian University, Sudbury, ON, Canada)
Final Days! Open Faculty Position in Experimental Earth Science (Columbia University, Palisades, NY, USA)
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Employers: All jobs posted in the Geochemical Career Center are cross-promoted through Facebook, Twitter and right here in Geochemical News.
New in GCA (v.123, 15 December 2013)
[open access] Earthworm-produced calcite granules: A new terrestrial palaeothermometer?
[open access] Short lived 36Cl and its decay products 36Ar and 36S in the early solar system
Experimental evaporation of Mg- and Si-rich melts: Implications for the origin and evolution of FUN CAIs
Redox transformation, solid phase speciation and solution dynamics of copper during soil reduction and reoxidation as affected by sulfate availability
An experimental study of the aqueous solubility and speciation of Y(III) fluoride at temperatures up to 250 °C
Changes in adsorption free energy and speciation during competitive adsorption between monovalent cations at the muscovite (0 0 1)-water interface
The source of phosphate in the oxidation zone of ore deposits: Evidence from oxygen isotope compositions of pyromorphite
Reconstructing the oxygen isotope composition of late Cambrian and Cretaceous hydrothermal vent fluid
Methane hydrates and global warming
Off the coast of Svalbard methane gas flares originating from gas hydrate deposits at depth of several hundred meters have been observed regularly. A new study conducted by an international team under the leadership of scientists from GEOMAR Helmholtz Centre for Ocean Research Kiel and MARUM — Center for Marine Environmental Sciences in Bremen shows, that the observed outgassing is most likely caused by natural processes and can not be attributed to global warming.
Astrophile: Wrinkles reveal Mercury's rapid slimming
Mercury just wanted to look its best. As the years rolled by the planet was losing the fire of its youth, but it was also slimming down, shedding a few pesky kilometers from its round, rocky body. Then the wrinkles started to sprout...
What lies beneath: Tiny organisms thrive below earth's surface
LiveScience via Fox News
Miles beneath the Earth's surface, where no light or air reaches, tiny organisms are eking out a meager existence.
Yet despite making up an estimated 6 percent of all life on Earth, researchers know almost nothing about these deep-dwellers. And scientists have failed to culture, or grow, the bacteria in the lab, making it difficult to understand how they survive the harsh, energy-starved environment below the planet's surface.
The stability of Fe-Ni carbides in the Earth's mantle
The Earth's mantle contains significant amounts of carbon and is at depths greater than ~250–300 km potentially so reducing that the Fe–C redox couple determines the nature of the reduced phase(s), which may be diamond, metal and carbides. Carbides will be Fe-rich but their stability also depends on the presence of Ni.
When was the last time volcanoes erupted on the East coast?
How Mole Hill in Virginia became a mountain is an old story, but not as old as some geologists think. The reason for that has to do with volcanoes — and may help explain why the U.S. East Coast, so long removed from geologic upheaval compared with the West, still suffers from relatively powerful earthquakes like the one that shook Mineral, Va., and much of the East Coast, in 2011.
Giant floods likely carved U-shaped canyons
South-central Idaho and the surface of Mars have an interesting geological feature in common: amphitheater-headed canyons.
These U-shaped canyons with tall vertical headwalls are found near the Snake River in Idaho, as well as on the surface of Mars, according to photographs taken by satellites.
Missed last week's issue? See which articles your colleagues read most.
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Lesley Warren, and Helen Williams
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