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Pervasive subduction zone devolatilization recycles CO2 into the forearc
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Journal Article
Pervasive subduction zone devolatilization recycles CO2 into the forearc
2020
Overview
The fate of subducted CO
2
remains the subject of widespread disagreement, with different models predicting either wholesale (up to 99%) decarbonation of the subducting slab or extremely limited carbon loss and, consequently, massive deep subduction of CO
2
. The fluid history of subducted rocks lies at the heart of this debate: rocks that experience significant infiltration by a water-bearing fluid may release orders of magnitude more CO
2
than rocks that are metamorphosed in a closed chemical system. Numerical models make a wide range of predictions regarding water mobility, and further progress has been limited by a lack of direct observations. Here we present a comprehensive field-based study of decarbonation efficiency in a subducting slab (Cyclades, Greece), and show that ~40% to ~65% of the CO
2
in subducting crust is released via metamorphic decarbonation reactions at forearc depths. This result precludes extensive deep subduction of most CO
2
and suggests that the mantle has become more depleted in carbon over geologic time.
The fate of subducted CO
2
remains debated, with estimates mainly from numerical predictions varying from wholesale decarbonation of the shallow subducting slab to massive deep subduction of CO
2
. Here, the authors present field-based data and show that ~40% to ~65% of the CO
2
in subducting crust is released via metamorphic decarbonation reactions at forearc depths.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
