Articles | Volume 10, issue 3
Solid Earth, 10, 907–930, 2019
https://doi.org/10.5194/se-10-907-2019

Special issue: Exploring new frontiers in fluids processes in subduction...

Solid Earth, 10, 907–930, 2019
https://doi.org/10.5194/se-10-907-2019

Research article 24 Jun 2019

Research article | 24 Jun 2019

Fluid–rock interactions in the shallow Mariana forearc: carbon cycling and redox conditions

Elmar Albers et al.

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Cited articles

Ague, J. J. and Nicolescu, S.: Carbon dioxide released from subduction zones by fluid-mediated reactions, Nat. Geosci., 7, 355, https://doi.org/10.1038/ngeo2143, 2014. 
Albers, E., Bach, W., Klein, F., Menzies, C. D., Lucassen, F., and Teagle, D. A. H.: Geochmistry and isotopic compositions of metavolcanic and metasedimentary rock-hosted minerals and serpentinite mud pore waters, recovered at the Mariana forearc during IODP Exp366, dataset, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.902648, 2019. 
Alt, J. and Shanks III, W.: Stable isotope compositions of serpentinite seamounts in the Mariana forearc: serpentinization processes, fluid sources and sulfur metasomatism, Earth Planet. Sc. Lett., 242, https://doi.org/10.1016/j.epsl.2005.11.063, 272–285, 2006. 
Alt, J. C. and Teagle, D. A. H.: The uptake of carbon during alteration of ocean crust, Geochim. Cosmochim. Acta, 63, 1527–1535, https://doi.org/10.1016/s0016-7037(99)00123-4, 1999. 
Austrheim, H. and Prestvik, T.: Rodingitization and hydration of the oceanic lithosphere as developed in the Leka ophiolite, north–central Norway, Lithos, 104, 177–198, https://doi.org/10.1016/j.lithos.2007.12.006, 2008. 
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Short summary
To understand the fate of carbon in subducted oceanic sediments and crust, we studied carbonate phases in rocks from the Mariana subduction zone. These show that carbon is liberated from the downgoing plate at depths less than 20 km. Some of the carbon is subsequently trapped in minerals and likely subducts to greater depths, whereas fluids carry the other part back into the ocean. Our findings imply that shallow subduction zone processes may play an important role in the deep carbon cycle.