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Columbia University via Phys.org
Deep beneath Alaska's Aleutian Islands, down where the pressure and temperatures have become so high that rock starts to flow, new continental crust is being born.
Scientists have long believed that continental crust forms in volcanic arcs – they know the magma brought up in the arcs' volcanoes is geochemically very similar to continental crust. The lingering question has been how exactly that happens. While the magma that reaches the surface is similar to continental crust, the lower crust beneath volcanic arcs is quite different from the lower half of continental crust.
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|Conference Calendar — March and April Deadlines
Abstract Deadlines Coming Up:
Mar. 4 – 4th International Workshop on Highly Siderophile Element Geochemistry
Mar. 15 - MS&T '16 - Materials Science & Technology Conference & Exhibition (Salt Lake City, Utah, USA)
Mar. 31 - 13th International Nickel-Copper-PGE Symposium (Perth-Fremantle, Australia)
Apr. 1 - 4th International Sclerochronology Conference (Portland, Maine, USA)
Registration Deadlines Coming Up:
Mar. 11 (Early Registration) - 10th South American Symposium on Isotope Geology (SSAGI) (Puerto Vallarta, Mexico)
Mar. 15 - Volcanism, Plate Tectonics, Hydrothermal Vents and Life (Azores, Portugal)
Mar. 31 - Biosignatures and the Search for Life on Mars (Iceland)
Apr. 1 - 7th Geochemistry Symposium with International Participation (Side-Antalya, Turkey)
Apr. 1 (Early Registration) - 4th International Sclerochronology Conference (Portland, Maine, USA)
Apr. 1 (Early Registration) - Clay Minerals Society (Atlanta, Georgia, USA)
Apr. 26 (Early Registration) - 2016 Goldschmidt Conference (Yokohama, Japan)
Apr. 30 (Early Registration) - 13th International Nickel-Copper-PGE Symposium (Perth-Fremantle, Australia)
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Lab Specialist in Organic Geochemistry, Petroleum Institute (United Arab Emirates)
Research Geologist/Research Chemist (Petroleum Geochemist),
US Geological Survey (Colorado, USA)
USGS Organic Geochemist Position, US Geological Survey (California, USA)
Chemical Oceanography – Tenure Track Position, California Polytechnic State University (USA)
Research Associate (PostDoc) (m/f) in Geo-Bio-Weathering Processes, Helmholtz Centre Potsdam – GFZ German Research Centre for Geosciences (Germany)
Two continuing teaching/research positions (1 Geochemistry, 1 Geophysics), University of Wollongong (Australia)
Postdoctoral Position, Scripps Institution of Oceanography (California, USA)
Full-Time faculty position in Geoscience, Université Libre de Bruxelles (Belgium)
Postdoctoral Fellowship in Isotope Geochemistry, University of Wisconsin at Madison (USA)
Does phylogeny control UK37 -temperature sensitivity? Implications for lacustrine alkenone paleothermometry
Experimentally determined sulfur isotope fractionation between metal and silicate and implications for planetary differentiation
Episodic carbonate precipitation in the CM chondrite ALH 84049: An ion microprobe analysis of O and C isotopes
[Open Access] Mass dependent fractionation of stable chromium isotopes in mare basalts: Implications for the formation and the differentiation of the Moon
Growth kinetics of step edges on celestite (0 0 1) surfaces as a function of temperature, saturation state, ionic strength, and aqueous strontium:sulfate ratio: An in-situ atomic force microscopy study
A revised seawater sulfate oxygen isotope record for the last 4 Myr
Clumped-isotope signatures at equilibrium of CH4, NH3, H2O, H2S and SO2
Crystallization of ikaite and its pseudomorphic transformation into calcite: Raman spectroscopy evidence
Barium isotope abundances in meteorites and their implications for early Solar System evolution
Fluid fractionation of tungsten during granite–pegmatite differentiation and the metal source of peribatholitic W quartz veins: Evidence from the Karagwe-Ankole Belt (Rwanda)
Early Earth differentiation investigated through 142Nd, 182W, and highly siderophile element abundances in samples from Isua, Greenland
The Washington Post
You could be forgiven for not being able to keep up with whether scientists do, or don't, think global warming "paused" during the early 2000s.
First, the U.N.'s Intergovernmental Panel on Climate Change told us, in a definitive 2013 report, that there had been a real slowdown of global warming over the past 15 years.
Anyone who has ever dissolved a piece of chalk in vinegar knows that ocean acidification—the result of seawater absorbing carbon dioxide (CO2) pollution from the air—has to be bad for calcareous creatures like coral. But just how big a role does ocean acidification play in the sickly state of many reefs? A new study borrows from a common after-dinner practice: popping a Tums to neutralize the acid and thereby isolate its effect on reef health.
The Associated Press
Sea levels on Earth are rising several times faster than they have in the past 2,800 years and are accelerating because of man-made global warming, according to new studies.
An international team of scientists dug into two dozen locations across the globe to chart gently rising and falling seas over centuries and millennia.
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