EAG News

Goldschmidt2018: Abstract submission and registration open online

G18_logo_100Abstract submission for the Goldschmidt 2018 Conference, scheduled for Boston from August 12-17, is now open. Learn how to prepare and submit your abstract here; the deadline is March 30, 2018. The full list of sessions to which you may submit an abstract is here.
Early online registration is also open; registration fees will increase by $100 after June 12, 2018.

2017 Distinguished Lecture Tour: videos of lectures available

DLPVideos of the lectures given by Lenny Winkel during the EAG Distinguished Lecture Tour 2017 are online: ‘Arsenic contamination of groundwaters’, ‘Global biogeochemical cycling of selenium’ and ‘Predicting broad-scale environmental distributions of trace elements’.

EAG Latest Publications

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GPL1801 abstractLarge oxygen excess in the primitive mantle could be the source of the Great Oxygenation Event
D. Andrault, M. Muñoz, G. Pesce, V. Cerantola, A. Chumakov, I. Kantor, S. Pascarelli, R. Rüffer, L. Hennet

Before the Archean to Proterozoic Transition (APT) the tectonic regime was dominated by microplates floating on a low viscosity mantle. Such a regime restricted chemical exchange between the shallow and deeper mantle reservoirs. […]

commentandreply_100Comment on “Repulsion between calcite crystals and grain detachment during water-rock interaction” by Levenson and Emmanuel, 2017
M. Le Merrer, J. Colombani

Levenson and Emmanuel suggested recently that the mechanism of carbonate rock weathering in fluids is not limited to nanoscale processes but that chemico-mechanical processes also take place at the micrometre scale, such as grain detachment from the material surface. This phenomenon was first observed in flowing liquids (Levenson and Emmanuel, 2016). […]

commentandreply_100Reply to comment on “Repulsion between calcite crystals and grain detachment during water-rock interaction” by Le Merrer and Colombani, 2017
Y. Levenson, S. Emmanuel

The comment by Le Merrer and Colombani (2017) focuses on the mechanisms that could account for our experiments, in which we observed the detachment of micrometre scale calcite grains from the surface of micritic limestone during contact with a reactive fluid (Levenson and Emmanuel, 2017). They discuss some of the forces acting on the grains and imply that our observations are likely to be artefacts of the experimental method. […]

PrintIodine proxy evidence for increased ocean oxygenation during the Bitter Springs Anomaly
W. Lu, S. Wörndle, G.P. Halverson, X. Zhou, A. Bekker, R.H. Rainbird, D.S. Hardisty, T.W. Lyons, Z. Lu

The Neoproterozoic Bitter Springs Anomaly (BSA; 810–800 Ma) is characterised by an 8 ‰ negative δ13C excursion and is coeval with multiple indicators of increasing oxygenation of the ocean and atmosphere. Here, we use carbonate iodine contents to provide the first constraints on the evolution of local upper ocean redox conditions spanning the BSA. […]

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GeoPersp_v6n2_100Glacier Biogeochemistry
Martin Sharp, Martyn Tranter

This issue of Geochemical Perspectives charts a paradigm shift in glacier geochemistry and hydrochemistry. The beds of glaciers and ice sheets were thought to be abiotic only 20 years ago, but now it is known that a diverse range of microbes colonise these environments, and that microbial processes influence chemical weathering and nutrient cycling in aqueous subglacial environments.

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