Jingbo Nan, Xiaotong Peng, Oliver Plümper, Iris C Ten Have, Jing-Guang Lu, Qian-Bao Liu, Shao-Lin Li, Yingjie Hu, Yu Liu, Zhen Shen, Weiqi Yao, Renbiao Tao, Martina Preiner, Yongxiang Luo
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引用次数: 0
摘要
海洋岩石圈的水蚀作用提供了大量能量,影响了有机化合物的合成和多样性,而有机化合物对深层碳循环至关重要,并可能为生命提供了最初的构成元素。虽然在地幔衍生岩石中已经有非生物有机合成的记录,但地壳岩石中有机化合物的形成机制和复杂性在很大程度上仍不为人所知。在这里,我们展示了西南印度洋脊(SWIR)岩浆岩壳岩石中脂肪族碳质与铁氧氢氧化物的特殊关联。我们利用多模式和分子纳米地球化学工具,确定了基于铁的非生物有机合成 CO2 和 H2 的潜在途径。量子力学建模被进一步用于约束氧化铁的催化活性,揭示了氢的催化循环可能在碳-碳键的形成中发挥关键作用。这种方法提供了在原子尺度上解释物理化学有机物形成和缩合机制的可能性。这些发现拓展了我们对大洋地壳岩石中存在非生物有机碳的认识,并强调了西南印度洋的岩浆大洋地壳是低温非生物有机合成的潜在场所。
Unraveling abiotic organic synthesis pathways in the mafic crust of mid-ocean ridges.
The aqueous alteration of the oceanic lithosphere provides significant energy that impacts the synthesis and diversity of organic compounds, which are crucial for the deep carbon cycle and may have provided the first building blocks for life. Although abiotic organic synthesis has been documented in mantle-derived rocks, the formation mechanisms and complexity of organic compounds in crustal rocks remain largely unknown. Here, we show the specific association of aliphatic carbonaceous matter with Fe oxyhydroxides in mafic crustal rocks of the Southwest Indian Ridge (SWIR). We determine potential Fe-based pathways for abiotic organic synthesis from CO2 and H2 using multimodal and molecular nano-geochemical tools. Quantum mechanical modeling is further employed to constrain the catalytical activity of Fe oxyhydroxides, revealing that the catalytic cycle of hydrogen may play a key role in carbon-carbon bond formation. This approach offers the possibility of interpreting physicochemical organic formation and condensation mechanisms at an atomic scale. The findings expand our knowledge of the existence of abiotic organic carbon in the oceanic crustal rocks and emphasize the mafic oceanic crust of the SWIR as a potential site for low-temperature abiotic organic synthesis.
期刊介绍:
The Proceedings of the National Academy of Sciences (PNAS), a peer-reviewed journal of the National Academy of Sciences (NAS), serves as an authoritative source for high-impact, original research across the biological, physical, and social sciences. With a global scope, the journal welcomes submissions from researchers worldwide, making it an inclusive platform for advancing scientific knowledge.