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

ore mineral precipitation. Many studies inferred the importance of mixing processes at the scale of entire ore districts from such geochemical considerations. However, hydrological models questioned the efficiency of fluid mixing processes at the scale of individual ore veins. This study by Tobias Fusswinkel and colleagues presents compositional data of ore fluids that formed a hydrothermal Pb-Zn vein mineralization in southwest Germany. Remnants of ore fluids trapped in closed cavities (fluid inclusions) on successively formed growth zones inside individual quartz crystals were analyzed for their chemical composition by laser ablation inductively coupled plasma mass spectrometry. Correlations between elements and element ratios (Pb, Zn, Cl/Br) indicative of fluids that interacted with either crystalline or sedimentary rocks provide the first direct evidence for fluid mixing processes to occur even at the scale of individual fluid pulses. These new findings will have to be taken into account in future studies on the genesis of hydrothermal base metal ore deposits.


Quantitative mapping of the oxidative effects of mantle metasomatism
Andrew J. Berry et al., Department of Earth Science and Engineering, Imperial College London, South Kensington SW7 2AZ, UK. Published online ahead of print on 16 April; http://dx.doi.org/10.1130/G34119.1.

The main rock type associated with diamond is garnet peridotite. The garnet records the oxygen fugacity of the mantle due to its ability to accommodate both Fe(II) and Fe(III). At the depths needed to produce diamond, the oxygen fugacity is sufficiently low for diamond rather than carbonate to be the stable phase of carbon. However, influx of melts or fluids (metasomatism) into the lithospheric mantle may impose higher oxygen fugacities. In this study by Andrew J. Berry and colleagues, the oxidation state of Fe in garnets from the
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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