High-pressure synthesis and storage of solid organic compounds in active subduction zones.
High-pressure synthesis and storage of solid organic compounds in active subduction zones.
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DOI：
10.1126/sciadv.abo2397
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发表时间：
2022-09-16
期刊：
影响因子：
13.6
通讯作者：
Williams, Helen Myfanwy
中科院分区：
文献类型：
--
作者：
Debret, Baptiste;Menez, Benedicte;Walter, Bastien;Bouquerel, Helene;Bouilhol, Pierre;Mattielli, Nadine;Pisapia, Celine;Rigaudier, Thomas;Williams, Helen Myfanwy
最近的热力学和实验研究表明，挥发性有机化合物（例如，甲烷、甲酸盐和乙酸盐）可以在俯冲带中产生和稳定，可能在深部碳循环中发挥重要作用。然而，缺乏高压生产和储存固体有机化合物的实地证据。在这里，我们研究弧前蛇纹岩碎屑钻泥火山以上马里亚纳俯冲带恢复。碳和铁稳定同位素特征与流体活动元素（B、As和Sb）浓度之间的显著相关性为来自板片的富CO2水流体通过弧前地幔的渗流提供了证据。高温碎屑（>350°C）中富含脂肪族部分的碳质物质的存在表明，与弧前蛇纹岩化相关的分子氢产生是板片衍生的富CO2流体还原和转化为固体有机化合物的有效机制。这些发现强调了将弧前地幔视为地球上有机碳的重要储存库的必要性。弧前超镁铁质碎屑的研究为俯冲带深部有机碳循环提供了证据。
Recent thermodynamic and experimental studies have suggested that volatile organic compounds (e.g., methane, formate, and acetate) can be produced and stabilized in subduction zones, potentially playing an important role in the deep carbon cycle. However, field evidence for the high-pressure production and storage of solid organic compounds is missing. Here, we examine forearc serpentinite clasts recovered by drilling mud volcanoes above the Mariana subduction zone. Notable correlations between carbon and iron stable-isotope signatures and fluid-mobile element (B, As and Sb) concentrations provide evidence for the percolation of slab-derived CO2-rich aqueous fluids through the forearc mantle. The presence of carbonaceous matter rich in aliphatic moieties within high-temperature clasts (>350°C) demonstrates that molecular hydrogen production associated with forearc serpentinization is an efficient mechanism for the reduction and conversion of slab-derived CO2-rich fluids into solid organic compounds. These findings emphasize the need to consider the forearc mantle as an important reservoir of organic carbon on Earth. The study of forearc ultramafic clasts provides evidence for a deep organic carbon cycle in subduction zones.
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板片地幔脱挥发分过程中无机碳和有机碳的解耦。
影响因子：
16.6
作者：
Bouilhol P;Debret B;Inglis EC;Warembourg M;Grocolas T;Rigaudier T;Villeneuve J;Burton KW
通讯作者：
Burton KW
影响因子：
64.8
作者：
Cai, Chen;Wiens, Douglas A.;Eimer, Melody
通讯作者：
Eimer, Melody
影响因子：
5.2
作者：
Eickenbusch, Philip;Takai, Ken;Lever, Mark Alexander
通讯作者：
Lever, Mark Alexander
影响因子：
18.3
作者：
Duncan, Megan S.;Dasgupta, Rajdeep
通讯作者：
Dasgupta, Rajdeep
影响因子：
2.9
作者：
Frery, Emanuelle;Fryer, Patricia;Zhao, J.
通讯作者：
Zhao, J.