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Glacial buzz-saws, gold in fool's gold, fingerprints in sea water, and fluvial iron
Date:10/19/2013

ale was the source. Results presented here by Damien Gaboury provide an independent validation of this model. It was postulated that if gold-bearing fluids are derived from organic-rich material, fluids involved in the formation of gold deposits should contain some hydrocarbon species. Fluid inclusions are microscopic bubbles of trapped fluids in minerals. Fluid inclusions from selected deposits around the world were analyzed for volatile composition by solid-probe mass spectrometry following a unique technique developed by the author. It is demonstrated that ethane (C2H6) is sourced from thermally degraded organic matter, hence providing a reliable tracer. The C2H6 content is recorded in fluids from Meso-Archean to Cretaceous gold deposits, providing support for a general model where fluids and gold were sourced from deeply buried, carbon-rich, and pyrite-gold-bearing sedimentary rocks.


Tectonic forcing of Early to Middle Jurassic seawater Sr/Ca
Clemens V. Ullmann et al., University of Copenhagen, Department of Geosciences and Natural Resource Management, and Nordic Center for Earth Evolution (NordCEE), ster Voldgade 10, 1350 Copenhagen-K, Denmark; c.v.ullmann@gmx.net. Co-authors: Stephen P. Hesselbo, and Christoph Korte. Posted online ahead of print 16 Oct. 2013; http://dx.doi.org/10.1130/G34817.1.

Earth's surface changes slowly, because of plate tectonic processes, long-term changes in climate, and even due to the activities of living organisms. On timescales of millions of years, these acting forces leave specific fingerprints in the chemical composition of seawater. Marine organisms record information about seawater composition in their shells. Fossil shell remains of such organisms can be used to estimate the variations of seawater composition through time and to evaluate the acting forces, leading to the observed var
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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