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Ancient ocean currents may have changed pace and intensity of ice ages
Geology Times
Climate scientists have long tried to explain why ice-age cycles became longer and more intense some 900,000 years ago, switching from 41,000-year cycles to 100,000-year cycles. In a paper published in the journal Science Express, researchers report that the deep ocean currents that move heat around the globe stalled or may have stopped at that time, possibly due to expanding ice cover in the Northern Hemisphere.
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Larter named 2014 Treibs Medalist
Stephen R. Larter, Canada Research Chair in Petroleum Geology at the University of Calgary has been selected as the recipient of the 2014 Alfred Treibs Award. Larter was nominated for his major and pioneering contributions in petroleum geochemistry through fundamental understanding of origins, transformation and fates of organic materials in the Earth and their practical application. The Treibs Award recognizes major achievements, over a period of years, in organic geochemistry. The award will be presented at the Organic Geochemistry Gordon Research Conference next month, with the Medal Talk and citation given at Goldschmidt2015 in Prague, Czech Republic.
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  Analab Corrosion Resistant Laboratory Appliances

Analab manufacture corrosion resistant laboratory appliances such as acid vapour cleaning stations, hotplates, and sample preparation devices. Our devices can be used with a wide range of acids and bases (HF to NH4OH). We are represented in North America by Isomass Scientific.

Please visit our website for upcoming conferences.

Geochemical Career Center

New! Faculty Position in Geology (Johns Hopkins University, Baltimore, MD, USA)

Faculty Position in Climate Change and Water Cycle (University of Michigan, Ann Arbor, USA)

Assistant Professor of Geochemistry (University of Tulsa, Tulsa, OK, USA)

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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  SESAR: Create Your Sample database

Do you work with samples of rocks, minerals, soils, water, etc.? SESAR can help you organize your sample metadata and ensure that your samples can be unambiguously cited, linked to data and publications via use of the IGSN (International Geo Sample Number), and become part of a global sample catalog.

New in GCA (v.138, 1 August 2014)
Hydromagnesite solubility product and growth kinetics in aqueous solution from 25 to 75 °C

Potentiometric and spectrophotometric study of the stability of magnesium carbonate and bicarbonate ion pairs to 150 °C and aqueous inorganic carbon speciation and magnesite solubility

[Open Access] Re–Os geochronology and Os isotope fingerprinting of petroleum sourced from a Type I lacustrine kerogen: Insights from the natural Green River petroleum system in the Uinta Basin and hydrous pyrolysis experiments

Discerning the timing and cause of historical mortality events in modern Porites from the Great Barrier Reef

HFSE (High Field Strength Elements)-transport and U–Pb–Hf isotope homogenization mediated by Ca-bearing aqueous fluids at 2.04 Ga: Constraints from zircon, monazite, and garnet of the Venetia Klippe, Limpopo Belt, South Africa

Microbial activities and phosphorus cycling: An application of oxygen isotope ratios in phosphate

Physiological and isotopic characteristics of nitrogen fixation by hyperthermophilic methanogens: Key insights into nitrogen anabolism of the microbial communities in Archean hydrothermal systems

Isotope fractionation of Li and K in silicate liquids by Soret diffusion

Mechanisms of chromate adsorption on hematite

Densification mechanisms of haplogranite glasses as a function of water content and pressure based on density and Raman data

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Conference Calendar August deadlines
Abstract Deadlines
Aug. 6: AGU Fall Meeting (USA)
Aug. 29: 12th Swiss Geoscience Meeting (Switzerland)

Registration Deadlines
Aug. 1: 7th International Conference on Geoscience Education (Geo SciEd) (India)

Conference organizers — be sure to add your conference to our conference calendar.

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Planet Mercury a result of early hit-and-run collisions
Planet Mercury's unusual metal-rich composition has been a longstanding puzzle in planetary science. According to a study published online in Nature Geoscience July 6, Mercury and other unusually metal-rich objects in the Solar System may be relics left behind by collisions in the early Solar System that built the other planets.
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"Life in the Field" photo contest
The American Geosciences Institute is looking for any and all geoscience images featuring your internships, research, or geoscience work as a whole. Photos can include indoor or outdoor work that depict the real working world of geoscientists. We want your best photos showing what geoscience work and research looks like and why you love being a geoscientist. Submitting epic photos allows participants the opportunity to win prizes from the collaborating geoscience societies. Deadline to submit is July 25. For more information visit the photo contest page.
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Missed last week's issue? See which articles your colleagues read most.

    Caltech-led team develops a geothermometer for methane formation (Caltech)
Fracking flowback could pollute groundwater with heavy metals (Cornell University via ScienceDaily)
New tunable laser spectrometer measures rare methane isotopologues (Deep Carbon Observatory)
Ancient ocean currents may have changed pace and intensity of ice ages (National Science Foundation)

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


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