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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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.