Pervasive subduction zone devolatilization recycles CO(2) into the forearc.
Pervasive subduction zone devolatilization recycles CO(2) into the forearc.
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DOI：
10.1038/s41467-020-19993-2
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发表时间：
2020-12-04
影响因子：
16.6
通讯作者：
Ague JJ
中科院分区：
文献类型：
--
作者：
Stewart EM;Ague JJ
俯冲CO2的命运仍然是广泛分歧的主题，不同的模型预测要么大规模（高达99%）脱碳的俯冲板或极其有限的碳损失，因此，大规模的深俯冲CO2。俯冲岩石的流体历史是这场辩论的核心：经历含水流体显著渗透的岩石可能比在封闭化学系统中变质的岩石释放出更多数量级的CO2。数值模型对水的流动性进行了广泛的预测，但由于缺乏直接观测，进一步的进展受到限制。在这里，我们提出了一个全面的基于现场的研究，在俯冲板（基克拉迪群岛，希腊）的脱碳效率，并表明，约40%至约65%的二氧化碳在俯冲地壳释放通过变质脱碳反应在弧前深度。这一结果排除了大部分二氧化碳的广泛深俯冲，并表明地幔在地质时期变得更加贫碳。俯冲CO2的命运仍然存在争议，估计主要来自数值预测，从浅俯冲板片的大规模脱碳到CO2的大规模深俯冲。在这里，作者提出了基于现场的数据，并表明，约40%至约65%的二氧化碳在俯冲地壳释放通过变质脱碳反应在弧前深度。
The fate of subducted CO2 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 CO2. 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 CO2 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 CO2 in subducting crust is released via metamorphic decarbonation reactions at forearc depths. This result precludes extensive deep subduction of most CO2 and suggests that the mantle has become more depleted in carbon over geologic time. The fate of subducted CO2 remains debated, with estimates mainly from numerical predictions varying from wholesale decarbonation of the shallow subducting slab to massive deep subduction of CO2. Here, the authors present field-based data and show that ~40% to ~65% of the CO2 in subducting crust is released via metamorphic decarbonation reactions at forearc depths.
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影响因子：
5.3
作者：
Dragovic, Besim;Baxter, Ethan F.;Caddick, Mark J.
通讯作者：
Caddick, Mark J.
影响因子：
5.3
作者：
Gorce, J. S.;Caddick, M. J.;Bodnar, R. J.
通讯作者：
Bodnar, R. J.
影响因子：
18.3
作者：
Ague, Jay J.;Nicolescu, Stefan
通讯作者：
Nicolescu, Stefan
影响因子：
3.4
作者：
Jorgensen, Taus R. C.;Tinkham, Douglas K.;Lesher, C. Michael
通讯作者：
Lesher, C. Michael
影响因子：
3.1
作者：
de Capitani, Christian;Petrakakis, Konstantin
通讯作者：
Petrakakis, Konstantin