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Geology covers multiple disciplines and substantial territory in April's new postings
Date:4/18/2013

f oxygen in Earth surface environments has been inferred from the sulfur isotope difference between seawater sulfate, preserved as carbonate-associated sulfate or evaporite minerals, and pyrite. In this manuscript, Maya Gomes and Matthew Hurtgen present sulfur isotope data from a permanently euxinic, low-sulfate lake and show that the sulfur isotope difference between sulfate and pyrite -- termed sulfur isotope fractionation -- is partially controlled by the size of the sulfate reservoir. The implication of this reservoir effect is that sulfate concentration places constraints on sulfur isotope values preserved in marine sediment: at low sulfate levels sulfate is rapidly consumed by sulfate reducing microorganisms and fractionation values are low, whereas in high sulfate systems, a smaller portion of the sulfate reservoir is reduced and fractionation values are high. Sulfur isotope fractionation values are particularly sensitive to sulfate levels at low sulfate concentrations. Thus, sulfur isotope fractionation values can be used to evaluate marine sulfate levels and biogeochemical cycling during periods of low marine sulfate in the Precambrian and Phanerozoic.


Fluid mixing forms basement-hosted Pb-Zn deposits: Insight from metal and halogen geochemistry of individual fluid inclusions
Tobias Fusswinkel et al., Institute of Geochemistry and Petrology, ETH Zurich, Clausiusstrasse 25, CH-8092 Zrich, Switzerland. Published online ahead of print on 16 April; http://dx.doi.org/10.1130/G34092.1.

The formation of hydrothermal base metal ore deposits is commonly assumed to result from fluid mixing processes. These involve hot, saline fluids transporting high metal concentrations from crystalline basement rocks to shallower crustal levels. Subsequent mixing with formation waters rich in reduced sulfur originating from sedimentary rocks then facilitates efficient sulfide
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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