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Mafic melts, methane seeps, 2 million waves, foreign magma, and the invisible hand
Date:4/11/2012

uggest that this model has application to other sedimentary basins associated with detachments.


Fluid-mineral reactions and trace metal mobilization in an exhumed natural CO2 reservoir, Green River, Utah

Max Wigley et al., Dept. of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK. Posted online ahead of print 10 April 2012; doi: 10.1130/G32946.1.

Natural CO2 reservoirs are an important tool for understanding the long-term processes that will occur in geological carbon storage sites. Max Wigley and colleagues show that an area of alteration near the town of Green River, Utah (United States), where originally red sandstones have been bleached white, is due to a CO2-bearing fluid. Reactions between the CO2 and the rock have resulted in growth of secondary carbonate minerals, and there is a zone of increased secondary mineral growth at the CO2-promoted reaction front. This is similar to predictions made using simple modeling techniques. The CO2-bearing fluid has also mobilized trace metals from the formation and deposited them in high concentrations at the reaction front. This area of alteration can be used as an analogue for processes in geological carbon capture and storage reservoirs. Trace metals mobilized by injected CO2 are likely to be rapidly redeposited.


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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

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